A commercial hydroponic lettuce program built around controlled nutrient strength, three calibrated growth stages, and humid-tropical root-zone realities.
Built specifically around commercial lettuce production.
Heat, humidity, warm root zones and source-water chemistry interact. Green Giant provides controlled nutrition inside that environment — fertilizer alone does not control it.
Sustained high temperature — especially warm nights — increases bolting, bitterness and loss of head quality. Balanced nutrition supports plant function, but cultivar and climate remain the primary heat controls.
Green Giant follows lettuce development by increasing total nutrient concentration as the crop establishes, expands its canopy and moves toward harvest.
The crop is steered primarily by concentration — not by repeatedly changing the nutrient ratio.
Stage 01
Begin with a deliberately moderate nutrient concentration while roots establish and the transplant adapts to the production system. The objective is functional establishment without imposing unnecessary osmotic load.
Establish roots first; increase concentration only as the crop is ready to carry greater nutrient strength.
Concentration increases progressively with crop development.
Components scale proportionally rather than using a different nutrient ratio at every stage.
EC is a verification tool, not the formulation recipe. Reference bands assume relatively low-EC source water; source-water alkalinity and native ions can alter the final reading.
Green Giant is evaluated by the elemental nutrition delivered to the crop — not by conductivity alone. Each stage increases the complete nutrient profile proportionally.
Dry fertilizer quantities define the intended fertilizer contribution. EC verifies the prepared solution, while source-water chemistry still forms part of the final root-zone environment.
Values shown are fertilizer-contributed elemental ppm. Final nutrient-solution chemistry also includes minerals already present in the source water and nutrients introduced during pH correction.
Nutrients present in solution are not automatically delivered to expanding leaves. Root function, solution chemistry, oxygen and canopy conditions determine how effectively the crop can use what is supplied.
Nutrient availability at the root is only the beginning. Uptake, transport and tissue delivery depend on the operating environment around the plant.
Keeps the root-zone chemistry within a practical range for balanced nutrient availability and micronutrient stability.
Warmer water reduces oxygen-holding capacity while root respiration and biological activity continue to rise.
Maintain dissolved oxygen at or above 4 mg/L as a practical minimum. Additional oxygen margin is desirable in warm hydroponic systems where root respiration and oxygen demand increase.
Uniform airflow supports leaf-level exchange and helps reduce stagnant, humid microclimates inside the developing rosette.
Calcium in the reservoir does not guarantee calcium delivery to the inner leaf. Tipburn risk is also influenced by root health, transpiration, airflow and the growth rate of rapidly expanding tissue.
Source water remains part of the calculation. Low EC alone is not enough to characterize suitability; alkalinity, Ca, Mg, Na, Cl and B can materially change the final nutrient environment.
Mix directly into the final reservoir, prepare the familiar NutriHydro label stock, or use the same A/B chemistry with an EC-controlled autodoser.
Keep calcium nitrate in Solution A. Keep Green Giant and magnesium sulfate in Solution B. Never combine concentrated A and B directly.
Choose a calculator
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Choose stock concentration
Press one option
Enter the exact final nutrient-solution volume you want in the reservoir.
Enter any final nutrient-solution volume from 1 L upward.
Enter a valid volume greater than zero.
Preparing 1,000 L final nutrient solution.
Direct dilution: the selected crop stage determines final nutrient concentration while the component ratio remains the same.
Fill the reservoir to 80–90% of final volume and start circulation.
Pre-dissolve Green Giant separately and mix clear.
Pre-dissolve MgSO₄·7H₂O separately and mix completely.
Dissolve calcium nitrate separately and add last. Top up, verify EC, then adjust pH.
Never combine concentrated calcium nitrate directly with concentrated Green Giant or magnesium sulfate. Calcium can precipitate with phosphate or sulfate.
Dry fertilizer quantities define the intended nutrient program. EC remains an operational verification measurement and should be interpreted with source-water chemistry.
Water level, EC, pH and individual ions do not move in lockstep. Restore volume first, mix thoroughly, then decide what the crop solution actually needs.
EC is a bulk conductivity measurement. It cannot confirm that nitrogen, potassium, calcium, magnesium and micronutrients remain in their intended ratios.
Reservoir level fell
Restore the reservoir to its normal operating volume with source water of known composition. Mix thoroughly, then measure EC and pH.
Transpiration and evaporation remove mostly water. Adding fertilizer simply because the level dropped can unnecessarily concentrate the root-zone solution.
Next check: if EC is below the crop-stage target after volume is restored and mixed, add the complete nutrient program proportionally.
Use the top-off, EC-drift and renewal logic above because the same nutrient solution continuously returns to the reservoir.
Manage separately. Water level, root exposure, aeration and nutrient concentration change without active recirculation.
A fixed 14–21 day reservoir dump is a conservative operational option, not a universal biological requirement. Replace solution according to source-water accumulation, persistent pH instability, ion imbalance, analytical divergence or root-health problems.
Green Giant is designed for commercial lettuce, but cultivar genetics still determine canopy form, spacing, heat response and harvest specification.
Use the same three-stage nutrient architecture, then adapt spacing, airflow, temperature management and harvest timing to the cultivar actually being grown.
Upright head architecture
Full-size Romaine commonly performs around 20–25 cm spacing. Avoid excessive overlap that restricts light and air movement around rapidly expanding inner leaves.
Approximately 20–25 cm for many full-size commercial types.
Canopy overlap, warm-night bolting pressure and restricted airflow into the inner rosette.
Do not use days alone to force the stage change. Move from establishment to expansion and finishing according to root recovery, canopy development and final market fill.
Recirculating. Maintain reliable flow, cool return water and healthy oxygenated roots.
Recirculating. Warm solution makes aeration especially important; maintain DO ≥4 mg/L, preferably 5–8 mg/L.
Static. Manage water level, root exposure and concentration separately from recirculating-system logic.
The nutrient proportions and three-stage concentration program supplied to the crop.
Genetics, temperature, light, airflow, root-zone oxygen, source water, spacing and sanitation.
Green Giant should not be presented as overriding cultivar genetics or tropical heat. The nutrient program supports the crop; environmental and cultural management determine whether that potential is realized.
A commercial nutrient program should be validated against the farm’s actual water, root-zone behavior, crop uptake and marketable harvest performance.
Separate fertilizer performance from source-water chemistry, environmental stress, root-zone problems and cultivar response.
Follow the evidence from water source to final harvest.
Test alkalinity or bicarbonate, calcium, magnesium, sodium, chloride and boron. A low starting EC is useful, but it does not describe the complete water chemistry.
Source, EC, pH, alkalinity and major mineral profile before commissioning or when source conditions change.
Record EC, pH, nutrient-solution temperature and dissolved oxygen. During validation, periodically compare the working solution against the intended nutrient profile when analytical testing is available.
EC · pH · water temperature · DO · reservoir volume · unusual pH or EC drift.
During initial commercial validation, use mid-crop and pre-harvest tissue analysis where practical, while standardizing cultivar, leaf age, sampling position and crop stage.
Tissue values should be read alongside growth rate, root condition, climate, cultivar and source-water chemistry.
Compare fresh mass, Class-A percentage, uniformity, days to harvest, tipburn, bolting, root condition and rejection reasons against the farm’s previous program under comparable conditions.
Measure marketable kilograms per square meter, per production cycle and per unit of water and fertilizer.
Judge the program by marketable output.
kg/m²/cycle · fresh mass · days to harvest
Class-A % · uniformity · rejection reasons
Tipburn · bolting · roots · disease pressure
Water + fertilizer used per kg marketable crop
Use a fair comparison. Evaluate Green Giant against the farm’s existing program using comparable cultivar, crop stage, season and environmental conditions.
Green Giant is a precision nutrient program for lettuce. It is not a substitute for root health, environmental control, suitable genetics or disciplined crop management.
Nutrition is controlled. Environment still determines how effectively the crop can use it.
EC is useful. It is not a laboratory analysis of individual ions.
The stage calendar guides. Actual crop and root development still matter.
Ten questions that define how Green Giant should actually be used.
No. Green Giant supplies the intended calcium and complete nutrient profile, but tipburn is fundamentally a localized calcium-delivery problem inside rapidly expanding leaves. Root health, transpiration, airflow, humidity, growth rate and temperature all influence calcium movement to the inner canopy.
Do not respond to tipburn automatically by adding more calcium. First evaluate airflow, root function, water movement and environmental conditions.
No. Bolting is driven mainly by temperature, photoperiod, developmental stage and cultivar genetics. Increasing nutrient concentration cannot compensate for sustained tropical heat or an unsuitable cultivar.
Use suitable genetics and manage heat load, warm nights, light exposure and harvest timing.
Not automatically. The dry fertilizer weights define the intended nutrient program. Final EC is also affected by source-water minerals and alkalinity, so EC should be used as an operational verification measurement rather than as the sole formulation target.
Know the source-water contribution, particularly alkalinity, Ca, Mg, Na, Cl and boron, before changing the complete recipe.
Because Green Giant uses concentration steering rather than major nutrient-ratio inversion. Nutrient proportions remain essentially constant while total nutrient strength increases from establishment through vegetative expansion and finishing.
The same nutrient architecture is delivered at a strength appropriate to root establishment, canopy expansion and final market fill.
Day 0 is the day the seedling is transplanted into the final production hydroponic system. It is not the sowing date. The stage calendar is a practical guide rather than a rigid biological timer.
Root recovery, active growth, canopy development and final market fill should confirm whether the crop is ready for the next stage.
Not as a universal biological rule. A scheduled partial or full renewal can be a useful risk-control SOP, but stronger triggers include Na/Cl accumulation, persistent pH instability, ion imbalance, analytical divergence, root problems or pathogen concerns.
A conservative scheduled partial renewal can still be practical, particularly when source-water chemistry or ion accumulation is uncertain.
No. Calcium nitrate must remain in Solution A, while Green Giant and magnesium sulfate belong in Solution B. Concentrated calcium should not be directly combined with concentrated phosphate- or sulfate-containing fertilizer because insoluble precipitates can form.
Keep A and B separate until they are independently diluted into the circulating nutrient solution. For direct mixing, add pre-dissolved Calcinit last.
Green Giant supports three preparation systems: Direct Dilution for making the final reservoir solution directly, Standard Stock for concentrated A/B preparation, and Half-Strength Autodoser Stock for easier dissolution and EC-controlled dosing.
The preparation method changes concentration and handling, not the intended final nutrient profile. In stock systems, A and B must be delivered equally by volume.
Yes. The program is intended for commercial lettuce including Romaine, Iceberg, Butterhead, Loose Leaf, Lollo Rossa and Batavia. It can be applied in NFT and DFT/DWC systems, while static Kratky production requires separate management of water level, root exposure and concentration.
Cultivar genetics still determine spacing, canopy architecture, heat sensitivity, maturity and final market specification.
Maintain the working nutrient solution near pH 5.8–6.2. Where feasible, keep solution temperature at or below approximately 25–26°C. Dissolved oxygen should remain at least 4 mg/L as a practical minimum, with approximately 5–8 mg/L preferred, particularly in warm DFT/DWC systems.
Warm water holds less oxygen. In Philippine lowland conditions, root-zone temperature, aeration and sanitation become increasingly important as solution temperature rises.
Green Giant controls the nutrient architecture. Commercial lettuce performance still depends on suitable genetics, source water, root-zone oxygen, temperature, airflow, sanitation and disciplined crop management.
Green Giant CFF is the nutrient base of a three-component commercial lettuce program. Use it with calcium nitrate and magnesium sulfate according to the stage-specific application protocol.
All three components scale proportionally through the crop stages.
Calcium nitrate · Solution A
Supplies the program's principal calcium and nitrate-N contribution.
Nutrient base · Solution B
Provides the calibrated N-P-K-S and chelated micronutrient matrix.
Magnesium sulfate · Solution B
Completes the program with additional magnesium and sulfur.
Follow the complete protocol. Keep concentrated calcium nitrate separate from the phosphate- and sulfate-containing Solution B, and use the prescribed Green Giant stage rates rather than estimating fertilizer additions from EC alone.
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