HYDROPONIC LETTUCE NUTRITION FOR THE HUMID TROPICS
NUTRIHYDRONH LETTUCE FORMULA
NH Lettuce Formula is a complete two-part hydroponic lettuce nutrient solution developed for highly hydrated, firm and crisp lettuce under humid-tropical production conditions in the Philippines.
Complete macro- and micronutrient nutrition for hydroponic lettuce.
One of only 6 companies in the world able to achieve complete two-part hydroponic nutrition at just 1 mL/L each.
TROPICAL GROWING CHALLENGES
The nutrient solution is only one part of the system. Air, water, roots, nutrition and physiology interact.
01 · HIGH HUMIDITY
When humidity is high, transpiration can fall. That can weaken calcium movement toward rapidly expanding inner leaves even when calcium is present in the root zone.
Do not automatically solve tropical crop stress by adding more fertilizer. More EC does not correct an environmental limitation.
LETTUCE PHYSIOLOGY
Crispness comes from hydration, cellular pressure and structural restraint working together within a root environment that supports water uptake.
01 · HYDRATION
Water moves through the vascular system into living leaf tissue, where large vacuoles hold most of the cellular water. Hydrated cells give lettuce volume and freshness, but hydration alone does not create crispness.
Freshness begins with hydration, but the clean snap of lettuce requires that water also generates cellular pressure against a competent structural framework.
Root-zone EC influences the osmotic environment for water uptake, while temperature, humidity and handling influence the final crop response.
Harvest quality begins in the crop. Actual shelf life still depends on temperature, humidity, respiration, handling and cold-chain conditions.
In tropical production, any link can become limiting. Warm roots, high humidity or excessive root-zone concentration can affect different parts of this chain—so simply adding more fertilizer is not always the correction.
THE NH LETTUCE FORMULA SYSTEM
Part A and Part B remain chemically separated as concentrates, then become one complete nutrient solution after dilution in water.
Ca · Nitrate-N · K
P · Mg · S · Fe · Micros
Concentrates stay separate until each is diluted into water.
SYSTEM ARCHITECTURE
Part A keeps the calcium-rich concentrate chemistry separate from phosphate- and sulfate-containing Part B. The two concentrates meet only after sufficient dilution in water.
Concentrated calcium should not be stored in direct contact with concentrated phosphate or sulfate chemistry. Separation improves concentrate stability and reduces precipitation risk.
The crop receives the same proportional nutrient relationship while total concentration rises through the production cycle: 50% → 80% → 100%. Exact stage ppm follows in Section 5.
THREE-STAGE FEEDING PROGRAM
The A:B nutrient relationship remains constant while total concentration rises with crop development: 50% → 80% → 100%.
STAGE 01 · DAYS 0–10
Use the same A:B ratio at half concentration during establishment. This reduces total ionic loading while maintaining the complete nutrient profile.
ppm values are elemental nutrient concentrations in the final nutrient solution at the selected dosing level.
Part A and Part B remain 1:1 by volume throughout the program. Stage progression changes total concentration, not the underlying nutrient relationship.
ROOT-ZONE & RESERVOIR MANAGEMENT
Nutrient performance depends on the water and root environment receiving it. Measure the system before changing the formula.
SOURCE WATER
Source-water conductivity becomes part of the final reservoir EC. Water below about 0.5 mS/cm is generally easier to formulate around, but EC alone does not tell you which ions are present.
Establish the water baseline before dosing. If pH correction is difficult or repeatedly rebounds, investigate alkalinity and bicarbonate rather than relying on EC alone.
pH and alkalinity are different measurements. A source can have acceptable EC yet still contain enough bicarbonate to influence buffering and acid demand.
A nutrient change cannot reliably correct poor water quality, unstable pH, concentrated reservoir EC or oxygen-limited roots.
MIXING & FERTIGATION
Choose the feeding stage and reservoir volume first. Part A and Part B always enter the water separately.
Seedling Stage · Days 0–10 · 0.50 mL/L of each concentrate
Each concentrate must enter water independently and become diluted before the other concentrate is added.
Fill the reservoir to approximately 80% of final volume and start circulation.
Add Part A and circulate for approximately 3–5 minutes.
Add Part B and circulate for another 3–5 minutes.
Top off to final volume and circulate for approximately 10 minutes before final measurement.
Keep Part A and Part B in separate stock containers and on independent feed or injection paths. Allow adequate water flow and dilution before the two nutrient streams meet.
Measure the finished nutrient solution—not either concentrate—to confirm the actual operating condition.
CROP PERFORMANCE & MONITORING
Plant symptoms are evidence—not a diagnosis. Observe the pattern, identify the limiting process, then respond.
TISSUE QUALITY
Well-hydrated lettuce should feel firm and crisp without appearing water-soaked or excessively soft. Loss of crispness can reflect restricted water uptake, excessive root-zone EC, warm roots or postharvest water loss.
Compare reservoir EC, root-zone temperature, solution flow, aeration and crop water demand before assuming a nutrient deficiency.
Tissue appearance alone cannot identify the exact cause. Diagnose from pattern, timing and root-zone conditions together.
Change the nutrient program only when the evidence indicates nutrition is actually limiting crop performance.
CULTIVARS & SYSTEM FIT
NH Lettuce Formula supports major lettuce types across several hydroponic systems. The nutrition stays consistent. Root-zone management changes.
NFT · NUTRIENT FILM TECHNIQUE
NFT gives roots rapid access to water and dissolved nutrients while much of the root system remains exposed to air. Flow reliability and warm-root-zone oxygen demand become key operating variables.
Maintain channel flow, monitor reservoir EC and pH, and minimize prolonged pump interruption—especially under hot tropical conditions.
System design changes water movement, oxygen, temperature and EC behavior. Manage those variables accordingly.
FREQUENTLY ASKED QUESTIONS
The formula is concentrated, but the operating logic is simple. Measure the water, dose by crop stage, and manage the root zone.
DOSING
Part A and Part B are always dosed at the same volumetric rate. Use 0.50 mL/L each during Days 0–10, 0.80 mL/L each during Days 11–20, and 1.00 mL/L each from Day 21 onward.
The program does not change the nutrient ratio between stages. The complete formula is simply supplied at progressively greater concentration as the root system, canopy and total crop demand increase.
Starting a small crop immediately at full concentration adds unnecessary ionic and osmotic load without providing a physiological advantage simply because more fertilizer is present.
Calculate the dose from the actual water volume in the reservoir. Add Part A and Part B separately to water, then verify the finished solution with your EC meter.
Measure water volume, EC and pH. Observe the crop and root zone before changing the nutrient program.
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