Hydroponics & Microgreens Knowledge Base

Water

Water Alkalinity: How to Calculate Acid Demand and Stop pH Drift

"KH and Alkalinity are the same thing, both measure water alkalinity." Almost true — and that "almost" breaks your calculations. KH and Alkalinity measure similar things but in different units and with different precision. The bigger problem: even knowing alkalinity, most growers still adjust pH by eye — instead of calculating exactly how much acid is needed to neutralize the buffer once and for all.

6 хв Read

Sanitation & Water

AOP (Advanced Oxidation Processes): UV-C, Ozone, and Photocatalysis in Your System

"AOP is the most powerful treatment — install it and all problems are solved." AOP is not a single technology and not a silver bullet. It is a class of methods that generate hydroxyl radicals (•OH) — short-lived but extremely reactive particles that destroy virtually any organic molecule and cell membrane. The problem is that AOP effectiveness depends on the combination of components, quality of setup, and conditions. An incorrectly chosen or poorly calibrated AOP system is an expensive device that creates an illusion of protection.

6 хв Read

Climate

CO₂ in Enclosed Spaces: Enrichment, Target Levels, and Common Illusions

You install a CO₂ cylinder, push levels to 1200 ppm, and wait for a 30% yield boost. Two weeks later — no visible difference. The reason is simple: CO₂ accelerates photosynthesis only when it is the limiting factor. If the plant is already limited by light or temperature — extra CO₂ simply goes unused. CO₂ enrichment amplifies a system that is already well-tuned. It does not fix a poorly tuned one.

6 хв Read

Oxygen & Roots

DO (Dissolved Oxygen): Measurement, Norms, and Why an Air Pump Is Not Enough

"DO is for scientific labs — an air pump is all we need and everything will be fine." But an air pump does not guarantee adequate DO — it only…

6 хв Read

Hydroponic Systems

DWC (Deep Water Culture): Oxygen, Temperature, and Common Failures

"DWC is the simplest system: a bucket, water, an air pump, seeds." That simplicity of entry is exactly what hides the main trap. The root is permanently submerged — which…

5 хв Read

Hydroponic Systems

Ebb & Flow: Flood Cycle, Tray Sizing, and the Risk of Root Suffocation

Ebb & Flow is marketed as a system where "the plant takes what it needs." Flood the tray, the root absorbs what it wants, water drains away. But if the…

5 хв Read

Nutrient Solution

Drain EC: How to Read the Output Solution and What It Tells You About the System

"Drain is waste — flush it and forget it." But drain is the only direct way to know what is happening in the root zone between irrigations. The EC and…

5 хв Read

Nutrient Solution

EC in Hydroponics: What Electrical Conductivity Measures and How to Control It

"EC 1.8 means the solution has the right amount of nutrients." This is a misconception that leads to chronic plant stress. EC does not show how much fertilizer is in…

4 хв Read

Plant Diseases

Fusarium: Crown and Root Rots — How to Tell It Apart from Root Rot

The root darkens, the plant wilts — the diagnosis seems obvious: Root Rot. You add hydrogen peroxide, improve aeration — no effect. A week later the plant is dead. The…

6 хв Read

Microgreens

HACCP for Microgreens: Core Requirements, Hazards, and the Minimum Document Set

HACCP gets written to pass an inspection — then the folder goes in a cabinet. Six months later an incident happens: a customer finds mold in the product, a supplier…

6 хв Read

Hydroponic Systems

Hydroponic Hardware: Pumps, Chillers, Aeration, Venturi, and Peristaltic Dosing

Growers choose a pump by its maximum flow rate — and end up with either too much velocity that tears the root mat in NFT, or a pump that can…

6 хв Read

Crop Protection

IPM in Controlled Environments: Pest Management as a System, Not a Spray Schedule

"IPM means using organic products instead of synthetics." With that understanding, a spinosad product and pyrethrin-based spray appear in the greenhouse — and the same logic continues: spot the pest,…

5 хв Read

Business

Growing KPIs: Which Metrics Actually Reflect the Health of Your Operation

"KPIs are for corporations. I run a small operation — I know how it's going." But "knowing how it's going" is a feeling, not a fact. The feeling says "this…

5 хв Read

Hydroponic Systems

NFT (Nutrient Film Technique): Film Mechanics, Slope, Flow, and Pump Dependency

"NFT is just a tube with a thin stream of water — the simplest system." That simplicity is exactly what deceives. NFT has no buffer — no substrate holding moisture,…

5 хв Read

Nutrient Solution

ORP / Redox: What Solution "Cleanliness" Means and When It Matters

"ORP is for chemistry labs — we don't need it." But ORP is the only parameter that integrates the microbiological state of a solution in real time. pH and EC…

5 хв Read

Sanitation & Water

PCO (Photocatalytic Oxidation): Where It Actually Works and Where It's Just a Box with a Lamp

"UV lamp + TiO₂ = complete disinfection of air and solution." A nice formula — but the real-world effectiveness of PCO devices depends on several factors manufacturers rarely mention: the…

5 хв Read

Nutrient Solution

pH Adjusters: Phosphoric, Nitric, and Citric Acid — Which to Use, When, and Why

"No phosphoric acid — I'll use citric, doesn't matter, both are acids." A week later: pH swings up and down for no apparent reason, the plant shows signs of phosphorus…

4 хв Read

Nutrient Solution

pH in Hydroponics: How Acidity Determines Nutrient Availability

"pH 6.0 — corrected, all good." But an hour later it is 6.8 again, the plant is showing chlorosis, and you cannot understand what is happening with a "correct" recipe.…

5 хв Read

Lighting

PPE and Lighting Efficiency: How to Choose a Grow Light

"This lamp is 800W and costs half the price — great value." But if that lamp's PPE is 1.8 µmol/J versus 3.0 µmol/J for the more expensive competitor, it delivers…

6 хв Read

Water

RO and Remineralisation: When Reverse Osmosis Helps and When It Complicates Things

"I'll install RO — and all my water problems will disappear." RO does solve problems with hard or alkaline water — but it creates new ones if you do not…

6 хв Read

Oxygen & Roots

Root Rot: How to Tell a Disease from a System Problem

You see brown slimy roots — you buy a fungicide. You treat, two weeks later the same thing is back. The problem is not that the fungicide is weak or…

6 хв Read

Microgreens

Senescence: What Happens to a Leaf After Harvest and How the Cold Chain Slows It Down

"Keeps up to a week in the fridge" — the standard answer to questions about microgreen shelf life. But if the cut was made at 24°C, the product sat at…

6 хв Read

Nutrient Solution

Top-Off and Flushing: Controlling Salt Levels, Not Just Topping Up by Eye

"The level dropped — topped it up to the mark." But every time you top up with clean water without adjusting the recipe, the system EC gradually rises. The plant…

5 хв Read

Sanitation & Water

UV-C in Water Treatment: Dose, UVT, Hydraulics, and Common Illusions of Effectiveness

"Installed a UV-C lamp — pathogens destroyed, system clean." UV-C does kill microorganisms in water — but only those that pass through the irradiation zone, only if the water is…

6 хв Read

Climate

VPD (Vapor Pressure Deficit): Why the Plant "Won't Drink" at Normal Humidity

Humidity 60%, temperature 24°C, EC and pH within range — and the tomato in week three is showing upward-curling leaf margins and signs of calcium deficiency. The agronomist says "add…

6 хв Read

Growing Media

VWC (Volumetric Water Content): What to Measure Instead of Guessing by Feel

"The substrate looks fine" — and the next irrigation fires on the timer. But one coco block at the same irrigation rate has VWC 75% while the neighbouring one has…

4 хв Read

Nutrient Solution

pH and EC Automation: Control Logic, PID, and Fail-Safe Scenarios

"Installed an auto-doser for pH — now I don't need to check." An auto-doser that you "set and forget" is a pump that can inject a litre of acid into…

6 хв Read

Climate

Seasonal Parameter Adjustment: EC, pH, Lighting, and Temperature

The same irrigation timer, the same EC 2.0, the same 16 hours of light — all year round. In February the plants look sluggish and the cycle drags. In August…

5 хв Read

Crops

Basil and Aromatic Herbs: Why They Demand More Than Lettuce

You place basil next to lettuce — the same system, the same solution, the same light. The lettuce grows normally; two weeks later the basil is small, leaves are dark…

4 хв Read

Plant Diseases

Bacterial Diseases in the Greenhouse: Soft Rots, Necroses, and Bacterial Wilt

Fungal disease is a familiar problem: there is a coating, a symptom, a product. Bacterial disease looks different: a water-soaked spot on a leaf, a slimy stem necrosis, a plant…

6 хв Read

Crop Protection

Whitefly: Identification, Outbreak Conditions, and Control

You notice tiny white insects flying up when you touch a leaf — spray with a pyrethroid. A week later they are back in force. Spray again. The effect lasts…

6 хв Read

Sanitation & Water

Biofilms in Hydroponics: Why the System "Grows Over" and How to Stop It

Found slime in the pipes — flushed with chlorine — two weeks later the slime is back. Sound familiar? The problem is not that you used too little chlorine. The…

5 хв Read

Bioponics

Bioponics: What It Is, How It Works, and Why the Usual Rules Do Not Apply

"I want to go organic — just replace the mineral nutrients with fish emulsion and carry on as before." A week later: clogged pipes, pH swinging from 4.5 to 8.2,…

6 хв Read

Plant Diseases

Powdery Mildew: Prevention, Conditions, and Why "Wiping the Leaf" Does Not Help

You notice white powder on a leaf — wipe it with a damp cloth, the powder disappears. Three days later it's back, but now on neighbouring plants as well. The…

6 хв Read

Growing Media

Coco Buffering: Why You Must Saturate with Ca/Mg Before Planting

"Buffering is to stop pH from jumping." That's the explanation you hear most often — and it's wrong. Coco buffering has nothing to do with pH. It's the process of…

5 хв Read

Climate

Ventilation and Air Circulation: Why Stagnant Air Means Disease

The vent is open — there's ventilation. But powdery mildew keeps coming back, tip burn on the lettuce won't clear, basil rots at the base. An open vent provides air…

6 хв Read

Hydroponic Systems

Vertical Systems (Vertical Farms): Where the Benefits Are and Where the Problems Are

A vertical garden looks like a solution to "more plants in the same floor space." But once a three-tier rack is running, it turns out the bottom tier receives 20%…

5 хв Read

Water

Water–Substrate Interaction: CEC, Ion Exchange, and What Happens After Irrigation

"The substrate just holds the water and the roots" — most growers think this until the first unexplained deficiency on a correct recipe, or until the pH "shifts by itself"…

6 хв Read

Microgreens

Microgreens Seed Selection: Crops, Suppliers, and Quality Checks

"I'll buy regular seeds from the garden centre — cheaper and the same thing." Not the same thing. Seeds for outdoor growing may be treated with fungicides and insecticides —…

5 хв Read

Hydroponic Systems

Choosing a System: DWC, NFT, or Drip — How to Match Your Crop and Scale

"Which system is best?" — a question with no answer. NFT is the best choice for lettuce in commercial production — and the worst for tomato at small scale. DWC…

6 хв Read

Legislation

Labelling and Sales Requirements for Greens and Microgreens in Ukraine

You wrote on the label "Pea microgreens, grown without pesticides, packed 08.03" — and consider that everything is done correctly. But if you sell through a shop or at a…

5 хв Read

Business

Yield Calculation: How to Measure It and Why "Weighed It After Harvest" Is Not Enough

"Harvested, weighed — that's my yield." But if you don't know the yield for each crop, each batch, and each cycle separately — you cannot calculate real cost of goods,…

5 хв Read

Water

Spent Nutrient Solution: What to Do with It and How to Stay Compliant

"Poured the drain down the sewer — done." Or: "I dump it in the garden — it's fertiliser." Both options carry risks that most small producers don't realise. Concentrated nutrient…

5 хв Read

Plant Diseases

Viral Diseases: Mosaics, Leaf Curl, and Chlorosis of Viral Origin

"A virus can't be treated — so there's nothing to figure out." That is exactly the logic that leaves a sick plant in the growing zone for another three weeks…

6 хв Read

Water

Water in Growing: Why Everything Starts with a Water Test

Most problems in hydroponics — unstable pH, phantom deficiencies, a plant that "won't grow" despite a correct recipe — share one common root: an unknown source water composition. Tap water…

5 хв Read

Hydroponic Systems

Hydroponics for Beginners: Where to Start and How to Avoid the Common Mistakes

"Bought a system, added nutrients, put it under a light — three weeks later pH is 4.2, roots are rotting, plant is yellow." Hydroponics is less forgiving than soil: mistakes…

6 хв Read

Growing Media

Hydroponic Foam and Sponge Substrates: When They Are Justified and When They Are Dangerous

"Foam is cheap and convenient — and plants grow in it." They do. But foam is the best environment for biofilms of any substrate used in growing. Its fine-pore structure…

5 хв Read

Greenhouse

Grow Room vs Greenhouse: Different Logic for Climate Control

"I'll move the system from the greenhouse into a closed room — everything will be the same, just without the wind." One month later: humidity at 95%, condensation on walls…

5 хв Read

Plant Nutrition

Humic and Fulvic Acids: When They Work and When They Cause Turbidity and Biofilms

"Humic acids are an organic booster — I add them constantly and the more the better." But humic acids in a hydroponic system are organic matter in solution. Organic matter…

5 хв Read

Bioponics

Digestate in Bioponics: What It Is and How to Make It Manageable

"Digestate from a biogas plant is a ready-made organic fertiliser — just dilute and irrigate." Diluted 1:10, applied to the system — three days later pH is 8.7, plants are…

6 хв Read

Plant Nutrition

Deficiency Diagnosis: How to Read a Leaf Without Getting It Wrong

"The leaf is yellowing — must be nitrogen." But yellow leaves are a symptom, not a diagnosis. Iron chlorosis, magnesium chlorosis, nitrogen chlorosis, and even viral mosaic all look similar…

6 хв Read

Business

Production Documentation: Logs, Batches, and Traceability

Documents exist — a folder in a cabinet, filled in before an inspection. But when a customer returns a batch with an off smell and asks which seeds, which substrate,…

6 хв Read

Microgreens

Microgreens Economics: Cost of Goods, Pricing, and Yield Calculation

Radish seeds — $2 for 500 g, tray — $0.40, growing medium — essentially free. Yield 150 g, sold at $1.20 per 100 g — that's $1.80 revenue per tray.…

6 хв Read

Electricity & Safety

Electrical Safety in the Greenhouse and Grow Room: RCDs, Earthing, and Common Wiring Mistakes

The system runs for months without issue — then someone grabs the metal casing of a pump with a wet hand and gets a shock. "Everything was working" does not…

6 хв Read

Crop Protection

Beneficial Insects in Protected Cultivation: How to Introduce Them Without Wasting Your Money

He bought a vial of Phytoseiulus, scattered them evenly over the plants, and waited. A week later the mite was still there — in greater numbers — and no predators…

6 хв Read

Water

Water Hardness (Ca/Mg): GH, Ionic Balance, and What to Do with Hard Water

"Hard water means lots of calcium — good for plants." The logic is understandable but incomplete. Hard water does contain calcium — but depending on the source it may also…

5 хв Read

Business

Production Logs: What to Record Daily, Weekly, and Per Batch

"I have a log — I fill it in once a month when I remember." Then a customer complains that a batch of radish is spoiled. When was it sown?…

4 хв Read

Business

Launching Microgreens Production: The Minimum Starting Package Without the Common Mistakes

"I'll start small, get the process right, then scale." Sounds sensible — but most people who start this way close within 3–6 months, not because the product is bad, but…

5 хв Read

Lighting

Shading and Reflective Surfaces: Managing Light Load in the Growing Space

"Put up a 70% shade net — cooler and darker." But a week later: fruit isn't colouring up, growth has slowed, DLI has dropped below the crop minimum. The shade…

5 хв Read

Plant Nutrition

Fertiliser Storage: Conditions, Shelf Life, and Safety

"Bought 25-kg bags of fertiliser, left them in the greenhouse next to the seeds and substrate." A month later: the seeds have absorbed moisture and won't germinate, the fertiliser surface…

5 хв Read

Business

Microgreen Sales: Channels, Packaging, and What Buyers Actually Check

Sales Channel Map: Requirements and Economics Direct Sales (Markets, Instagram, Subscriptions) Highest price and margin — 100% of revenue stays with you Real costs include time spent on communication, individual…

6 хв Read

Climate

Winter Growing in Ukraine: Short Days, Cold, and Power Cuts

Introduction In December, natural sunlight delivers just 3–4 mol/m²/day, while leafy greens need 15–17. Growth cycles stretch from 28 to 45 days. Unheated greenhouses in Kharkiv drop to −10°C on…

5 хв Read

Greenhouse

Production Space Zoning: Flows, Sanitation Areas, and Quarantine

Poor space organisation leads to rapid spread of pests and disease. "I'll put the seedlings wherever there's room, new transplants next to old ones, tools wherever is convenient" — this…

5 хв Read

Growing Media

Inert Substrates (LECA, Gravel): Preparation and Recirculation

"LECA is inert — just rinse it and plant." But fresh LECA from the shop has an alkaline pH of 7.5–8.5 and production dust that immediately raises solution EC. After…

5 хв Read

Plant Nutrition

Ionic Antagonism: Why You Cannot Simply Add More Potassium

The Core Problem A common misconception: "browning leaf edges means potassium deficiency — just add more potassium." But this symptom often reflects antagonism, not a true deficiency. Browning edges with…

5 хв Read

Nutrient Solution

EC Meter Calibration: Accurate Readings, Not Just Numbers

Why EC Meters Drift Mineral deposits on electrodes — Ca, Mg, and Fe from fertilisers accumulate on the plates, changing their effective surface area. Temperature error — conductivity changes by…

6 хв Read

Nutrient Solution

pH Meter Calibration: How Not to Ruin Every Reading

Why Readings Drift Electrode contamination — salts and deposits build up on the glass membrane, slowing ion diffusion. Drying out — the glass membrane requires constant hydration. Leaving the electrode…

5 хв Read

Plant Nutrition

Calcium and Magnesium in Plant Nutrition: Role, Antagonism, and Why CalMag Does Not Always Help

Symptoms of Ca and Mg Deficiency Calcium deficiency — appears on young leaves: distortion and curling (Ca is immobile within the plant and cannot be redistributed from older tissue). Magnesium…

5 хв Read

Oxygen & Roots

Oxygen in the Root Zone: Why DO Determines Root Health

"Roots are in water — so there's oxygen." This is the most expensive misconception in hydroponics. Water does contain oxygen, but in limited quantities — and roots consume it faster…

5 хв Read

Growing Media

Coco Coir: Why a "Neutral" Substrate Actively Affects Your Solution

Why Coco "Steals" Calcium and Magnesium Fresh coco coir contains sodium and potassium — residues from sea-water processing. When irrigated with a solution containing Ca and Mg, ion exchange occurs:…

4 хв Read

Deficiencies, Stress & Disease

Root System: Structure, Functions, and Problem Signals

Introduction The root system is far more complex than simply anchoring a plant and absorbing water. When hydroponic systems show wilting with full reservoirs, or nutrient deficiencies despite correct dosing,…

5 хв Read

Hydroponic Systems

Drip Irrigation: Dripper Types, Irrigation Schedules, and Salt Accumulation

"Set the timer to 4 times a day — the system waters itself." But a drip system on autopilot is a timer that has no idea whether the substrate dried…

6 хв Read

Plant Nutrition

Silicic Acid (Si): Stable Forms, Precipitation Risks, and Silicate Conflicts

Why Silicon Form Is Critical K₂SiO₃ (potassium metasilicate): Concentrate pH 11–12 Below pH 9 it converts to Si(OH)₄ At pH 6.0–7.0 stable up to 100 mg/L; above 150–200 mg/L —…

6 хв Read

Crops

Leafy Greens: Solution Parameters, Growth Cycle, and Common Problems

"Lettuce is undemanding — it will grow in almost anything." But it is precisely this reputation that leads growers to cultivate lettuce under conditions where it "kind of grows" —…

4 хв Read

Climate

Summer Growing and Heat Management: Keeping Solution Temperature and Microclimate Under Control

Introduction In enclosed systems, when outdoor temperatures reach 38°C, nutrient solution temperature can climb to 28–30°C — dangerous conditions where dissolved oxygen drops and root pathogens activate. Key Terms Solution…

4 хв Read

Water

Water Alkalinity (KH): Why pH Will Not Stay Corrected

You add acid — pH drops to 6.0. An hour later it is back at 7.2. You add more acid — it drops again, then climbs back. It feels like…

5 хв Read

Plant Nutrition

NPK Macronutrients: Nitrogen, Phosphorus, Potassium — Role and Balance

The Role of Each Element Nitrogen (N) — chlorophyll, amino acids, proteins. Excess: lush foliage, weak roots, increased disease susceptibility. Peak consumption occurs during vegetative growth. Phosphorus (P) — energy…

4 хв Read

Plant Nutrition

Stock Solutions A and B: Why Two Concentrates — and Why They Must Never Be Mixed

"Two bottles is just marketing to sell more product." In reality, two concentrates are a chemical necessity. Ca²⁺ and SO₄²⁻ stored together in concentrated form produce insoluble CaSO₄ — gypsum.…

6 хв Read

Oxygen & Roots

Micro- and Nanobubbles: Oxygenation, Cleaning, and Where the Technology Actually Works

Quick Glossary Nanobubbles — gas bubbles smaller than 200 nm; remain stable in solution for minutes to hours Microbubbles — bubbles in the 1–100 µm range Cavitation — the generation…

5 хв Read

Bioponics

Microbiology in Hydroponics: Beneficial Flora, Pathogens, and the Delicate Balance

Quick Glossary ORP — oxidation-reduction potential (mV); a measure of the solution's ability to suppress pathogens Biofilm — an organised colony of microorganisms on system surfaces Pathogens — Pythium, Fusarium,…

6 хв Read

Bioponics

Microbial Inoculants: When Bacteria Help — and When They Just Consume DO

Key Terms Inoculant — a preparation containing live microorganisms intended for specific functions (pathogen suppression, improved nutrient uptake, growth stimulation) DO (Dissolved Oxygen) — consumed by aerobic bacteria and roots…

6 хв Read

Plant Nutrition

Micronutrients in Hydroponics: Fe, Mn, Zn, Cu, B, Mo — Role and Availability

Quick Glossary Fe — essential for chlorophyll synthesis; above pH 6.5 it precipitates as Fe(OH)₃ even in chelated form Mn — activator of photosynthetic enzymes; deficiency occurs above pH 6.5…

6 хв Read

Microgreens

Microgreens vs Sprouts: Different Logic, Different Risks

"Microgreens are just sprouts grown in soil and left a bit longer." But regulators in most countries draw a clear distinction — and for good reason: sprouts are grown in…

4 хв Read

Microgreens

Microgreens: The Basic Cycle from Sowing to Harvest

"Sow on a windowsill, cut in a week, sell." For home use — yes. For commercial production — no. Between "it grew" and "the right quantity, the right quality, ready…

5 хв Read

Water

Mineralising Concentrates for RO Water: The Logic of Remineralisation

Why Standard Fertilisers Do Not Replace Remineralisation Unstable pH: without KH, any micro-addition of acid sends pH from 7.0 to 4.5 — there is no buffer. In RO water, pH…

6 хв Read

Growing Media

Rockwool: Why a "Neutral" Substrate Still Needs Preparation

Why Fresh Rockwool Raises pH The fibre surface becomes alkaline during manufacturing (basalt melted at high temperature). When irrigated, drainage pH rises to 7.0–8.0 even when the input solution pH…

4 хв Read

Crop Protection

Pest Monitoring: Yellow Sticky Traps, Scouting Routes, and Action Thresholds

"I do monitor — if I see a pest, I treat immediately." But a pest spotted on a plant is already a population that has had time to multiply and…

6 хв Read

Bioponics

Nitrification in Bioponics: Why pH Drops, DO Disappears, and How to Keep the Process Running

The system is up, fish emulsion added, bacteria are "doing everything themselves." Three weeks later: pH 4.8, the solution smells of ammonia, roots are brown. Bacteria do not work on…

6 хв Read

Microgreens

Microgreen Seeding Rates: Logic, Not a Table From the Internet

Why One Seeding Rate Does Not Work for All Crops Seeds vary enormously in weight — radish and sunflower differ by a factor of 10–15. Measuring in grams per area…

5 хв Read

Cultivation Techniques

Pre-Sowing Seed Treatment: Scarification, Stratification, and Disinfection

Key Terms Scarification: Mechanical or chemical disruption of the seed coat to accelerate water uptake and the onset of germination. Applied to seeds with a hard, impermeable coat. Stratification: Cold,…

4 хв Read

Sanitation & Water

Ozonation (O₃): Residual Ozone, Degassing, and Operator Safety

How Ozone Works Ozone oxidises the cell membranes of pathogens and the organic matrix of biofilms. At a contact dose of 2–5 minutes, it achieves 99.9%+ destruction of most hydroponic…

6 хв Read

Greenhouse

Greenhouse Heating: Types, Calculations, and Common Mistakes

A 50 kW heat generator creates sharp temperature swings — from +28°C near the source to +9°C in the opposite corner — resulting in uneven plant growth across zones. Quick…

4 хв Read

Legislation

Organic Certification in Ukraine: Requirements, Certification Bodies, and Real Costs

The absence of chemicals does not automatically grant the right to label products as "organic." Since 2019, Ukrainian law requires that any food product labelled "organic," "органічний," or "organic" must…

5 хв Read

Cultivation Techniques

Organic Waste in Growing: Composting, Disposal, and Biogas

Introduction Spent substrate and root balls going into bin bags every week. These organic materials are potential resources when managed correctly. Plant waste from hydroponic and substrate-based production contains nitrogen,…

4 хв Read

Lighting

Grow Light Metrics: PPFD, DLI, and Why Watts Don't Matter

Quick Glossary PAR — photosynthetically active radiation (400–700 nm) PPFD — photosynthetic photon flux density at the leaf surface (µmol/m²/s); intensity at a specific point DLI — daily light integral…

6 хв Read

Nutrient Solution

Osmotic Stress in Plants: When the Nutrient Solution Works Against the Root

Quick Glossary Osmotic stress — the osmotic pressure of the solution approaches or exceeds the internal potential of root cells, preventing water uptake Turgor — internal cell pressure that maintains…

5 хв Read

Crop Protection

Spider Mite: Outbreak Conditions, Diagnosis, and Control

Conditions That Trigger an Outbreak Optimal reproduction occurs at 28–32°C and humidity below 50%. Above 70% humidity, reproduction slows; above 80% it nearly stops. The first response to a mite…

6 хв Read

Deficiencies, Stress & Disease

Transplanting and Adaptation: Transplant Stress and How to Minimise It

When seedlings move from one environment to another, they experience shock from the change in conditions. Root zone moisture, solution concentration, substrate type, and air-filled pore structure all differ from…

4 хв Read

Growing Media

Perlite and Vermiculite: Aeration, Drainage, and Their Role in Substrate Mixes

Quick Glossary Perlite — thermally expanded volcanic glass; chemically inert, improves aeration and drainage, holds no nutrients Vermiculite — a mica-group mineral; retains water and cations (CEC 10–20 meq/100g) Perlite:…

6 хв Read

Hydroponic Systems

First System Run (Priming): Flushing, Disinfection, and Verification

Step 1: Flushing Fill with clean water, circulate for 30–60 minutes, then drain. Repeat twice. EC after flushing should be ≤0.3 mS/cm — if not, continue flushing. Step 2: Disinfection…

6 хв Read

Water

Water Preparation: Why a Filter Alone Does Not Solve the Problem

You installed a filter — pH still swings. You set up reverse osmosis — the water became "strange" and plants respond worse than before. Sound familiar? The equipment isn't the…

6 хв Read

Cultivation Techniques

Irrigation by Drain EC and pH: Feedback from the Substrate

Drainage is not waste. It is feedback from the substrate — showing what is happening inside where you cannot see. Key Definitions Drain EC — electrical conductivity of the liquid…

5 хв Read

Microgreens

Watering Microgreens: Bottom, Top, and Misting — What to Use and When

The tray looks fine — not dry, not flooded. Three days later the stems have collapsed, the root is black, and there's a smell of rot. The problem is not…

6 хв Read

Crops

Strawberries in Hydroponics: Variety, Nutrition, and Pollination Indoors

"Plant strawberries in coco, add nutrients — three months later, berries." Three months pass: lush green foliage, runners everywhere, and not a single berry. In a controlled environment, strawberries require…

4 хв Read

Crops

Tomatoes and Cucumbers in a Greenhouse: Key Agronomic Questions

"I've been growing tomatoes in the open field for years — in a greenhouse it's the same, just faster." First year in the greenhouse: blossom end rot on a third…

5 хв Read

Crop Protection

Aphids in the Greenhouse: Sources, Control, and the Ant Connection

Three Real Sources of Aphid Infestation Infested planting material — quarantine for 7–10 days with thorough inspection before introducing plants to the growing area. Winged forms — when a colony…

6 хв Read

Bioponics

Probiotic Products and Mycorrhiza: When They Actually Work in Hydroponics

Why Mycorrhiza Rarely Works in Typical Hydroponics At phosphorus concentrations above 50–100 µM in solution, "mycorrhizal symbiosis either does not form or remains minimal." Where it is justified: Substrate-based systems…

6 хв Read

Cultivation Techniques

Seed Germination: Soaking, Temperature, and Common Failures

"Sowed peas into moist coco — four days later nothing, seven days later a few scattered sprouts, most never emerged." Seeds don't "just grow" when moisture is present. Each seed…

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Legislation

Food Production Registration in Ukraine

"I'm starting to sell microgreens — do I need a licence?" Or the opposite: "I'm an individual, selling at a market — nothing required." Both statements are wrong. A food…

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Cultivation Techniques

Irrigation Regime in Substrate Systems: Frequency, Volume, and the Irrigation Window

A correct irrigation regime is not "when it dries out" and not "on a fixed schedule." It is the balance between sufficient moisture for transpiration and sufficient aeration for root…

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Electricity & Safety

Backup Power and Surge Protection: Practical Guide for Ukraine

Backup power does not solve the problem of outages — it solves the problem of transitioning between power sources without losing control of the system. Quick Glossary UPS (Uninterruptible Power…

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Plant Nutrition

Nutrient Recipe: Understanding the Logic, Not Just Copying the Table

"Found a tomato recipe on a forum — using it." But that recipe was formulated for specific water, a specific substrate, and specific lighting. With your GH 10°dH water it…

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Hydroponic Systems

Recirculating vs Drain-to-Waste Systems: What to Choose and Why

Recirculation looks like the obvious winner: one reservoir, solution loops continuously, nothing is wasted. But if the system runs three weeks without flushing — the EC in the reservoir is…

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Bioponics

The Rhizosphere: The Microbial Environment Around the Root and Why It Matters More Than the Recipe

"The rhizosphere is about organics and biodynamics — not hydroponics." But the rhizosphere exists around every root regardless of the growing system — in DWC, in coco, in rockwool. The…

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Lighting

Lighting Uniformity: Measurement Points, PPFD Mapping, and Typical Shadow Zones

One fixture centred over the shelf, plants growing. But by the end of the week you notice: leaves at the edges are smaller, colour is paler, growth is lagging. Quick…

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Electricity & Safety

Electrical Load Calculation: Fixtures, Pumps, Chillers, and Automation

"Plugged it in — breaker didn't trip, so it's fine." The 16 A breaker is indeed not tripping — but the cable between the panel and the outlet has been…

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Business

Space and Equipment Planning: How Not to Overbuy

"I have 20 m² — I'll buy some shelves, some fixtures, and get started." But between "I have floor space" and "the system runs efficiently" lies a series of decisions…

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Deficiencies, Stress & Disease

Plant Stress: Abiotic and Biotic — How to Identify and Address the Cause

"Leaves yellowing — probably nitrogen" or "plant wilting — probably mites." You add nitrogen — yellowing doesn't stop. You look for mites — find nothing. Meanwhile EC is 4.2 mS/cm…

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Sanitation & Water

Sanitisers: H₂O₂ and PAA — Concentrations, Contact Times, and Common Mistakes

"Poured hydrogen peroxide into the tank — system is clean." But hydrogen peroxide in the reservoir during active growing is not system disinfection. It is root stress if the concentration…

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Sanitation & Water

Pipeline Sanitation: Removing Organic Deposits Without Stopping the System

"Flushed with chlorine between cycles — system is clean." Three weeks into the new cycle: slime again, root rot again, no idea where it's coming from again. Pipeline sanitation is…

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Bioponics

Sanitation in Bioponics: How to Preserve Beneficial Biology Without Growing Biofilms

Key Terminology Sanitation — measures for cleaning and treating systems that reduce pathogen risk; fundamentally different from mineral hydroponics where disinfectants can be applied broadly. Disinfectant — chemicals that kill…

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Nutrient Solution

Sensors in Hydroponics: pH, EC, DO, ORP, and Temperature Together

"pH meter reads 6.0 — good. EC meter reads 2.2 — good. Temperature 24°C — good." Three separate "goods" — but together they may signal a problem. At pH 6.0,…

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Plant Diseases

Grey Mould (Botrytis): Outbreak Conditions, Diagnosis, and Control in the Greenhouse

Sprayed a fungicide, a week later grey mould is back. Switched products — same result. The problem is not that the fungicide is weak or wrong. Botrytis returns because the…

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Lighting

Lighting Spectrum: What Plants Take from White, Red, and Blue

"Bought a 'full spectrum' LED with purple light — plants are growing but look odd: stretched, pale, large leaves and thin stems." A combination of red (660 nm) and blue…

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Business

Water and Fertiliser Consumption: Calculating Cost of Resources

"We irrigate, fertilise, harvest — but where exactly do the costs go?" Without resource accounting, the answer is always approximate. Water and fertiliser are not just operational costs — they…

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Microgreens

Microgreen Substrates: Jute, Coco, Peat, and Foam — What to Use and When

"Used a coco mat — radish lodged on day three. Switched to peat — basil germinates unevenly and the bottom layer turns sour." Substrate choice depends on the specific moisture-holding…

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Cultivation Techniques

Seed Viability: How to Test a Lot Before Sowing

Introduction The "90% germination" label on a packet may not reflect actual germination after storage. A quick 3–5 minute germination test provides actionable viability data for adjusting sowing density. Key…

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Climate

Temperature and Humidity in the Greenhouse: Targets, Interactions, and Common Mistakes

The thermostat holds 22°C, the hygrometer reads 65% — both parameters "within range." But at night temperature drops to 16°C and the same absolute amount of moisture in the air…

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Water

Nutrient Solution Temperature: Effects on Root Function and Nutrient Uptake

"The main thing is it shouldn't be cold" — so you set the nutrient solution bucket somewhere warm. But "not cold" and "the right temperature" are different things. At 26°C…

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Greenhouse

The Greenhouse as a System: Structure, Cladding, and Microclimate

"Bought a 3×6 polycarbonate greenhouse, put it up — now protected from rain and frost." First summer: 48°C inside in July, plants burning out every day after 11 a.m. First…

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Growing Media

Peat and Peat Mixes: pH, Structure, and Limitations in Hydroponics

"Peat is the classic — everything grows in it." It does grow — but with constant pH management battles if you don't understand its nature. Peat is acidic from the…

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Climate

Plant Transpiration: How a Leaf Breathes and What It Means for Climate Control

"Plants release water" — technically correct, but it only describes one side. Transpiration is not simply evaporation: it is the driving force that pulls water from root to leaf, carries…

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Crop Protection

Thrips in Controlled Environments: Diagnosis, Development Cycle, and Control

Found silvery spots on the leaves, spotted small insects — diagnosed thrips, bought an insecticide, applied it. Two weeks later the thrips is back and there are more of them.…

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Microgreens

Microgreens Packaging and Storage: Cold Chain and Modified Atmosphere

Microgreens were sealed in a standard zip bag, placed in the fridge, and labelled with a 10-day shelf life. On day five, a customer reports yellowing and an off smell.…

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Deficiencies, Stress & Disease

Plant Phenology: Growth Phases and How to Adjust Parameters at Each Stage

Introduction Phenology is the science of seasonal events and developmental stages in living organisms. In growing practice, it refers to the sequence of physiological stages a plant passes through and…

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Bioponics

Filtration in Bioponics: Mechanical and Organic Matter Under Control

Key Definitions Mechanical filtration — removal of solid particles (organic sediment, fertiliser residue, dead organic matter, root hairs) through physical barriers. Biofilter — a material or structure where nitrifying bacteria…

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Plant Nutrition

Nitrogen Forms (NH₄⁺ vs NO₃⁻): How Nitrogen Changes pH from Within

"Total nitrogen is normal — nutrition is fine." But the plant absorbs NH₄⁺ and NO₃⁻ through different mechanisms — and each form changes solution pH differently during uptake. When NH₄⁺…

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Lighting

Photoperiod and Plant Circadian Rhythms: How the Light Schedule Affects Growth

Set the light to 20 hours — "more growth." Basil looks fine the first week, then suddenly starts flowering in week three instead of week six. Cutting the vegetative period…

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Crop Protection

Fungicides and Bactericides in Controlled Environments: Selection, Rotation, Resistance

"This fungicide worked for me — I use it every time." Three seasons in a row with the same product against powdery mildew — and in the fourth season, effectiveness…

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Microgreens

Microgreens Diseases: Mould, Damping-Off, Bacterial Disease — Diagnosis and Prevention

"Saw white fluffy growth between the stems — reached straight for the fungicide. But in 80% of cases, mould on microgreens is not an external infection — it is a…

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Plant Nutrition

Chelates (EDTA, DTPA, EDDHA): When Iron Is Present but Chlorosis Persists

"Bought iron chelate, applied it — chlorosis should disappear." But a week later, young leaves are still yellow. The chelate is in the solution — but if pH is 6.8…

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Plant Nutrition

Fertiliser Chemical Compatibility: What Precipitates and How to Avoid It

"Diluted with water — now everything can be mixed together." But some ion pairs form insoluble compounds regardless of dilution — the solubility product does not depend on how "carefully"…

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