Nutrient Solution Program

This tool allows you to select fertilisers for Tank A and Tank B, input amounts and stock tank volumes, and calculate stock (100x concentrate) and diluted (1:100) solution concentrations, including elemental breakdown and ion balance. Molecular weights are auto-filled (Source: "Nutrient Solutions for Greenhouse Crops", Table 5, p.26 for fertiliser composition, Table 7, p.39 for atomic weights).

Tank A Inputs

Fertiliser Name:

Molecular Wt. (g/mol):

Stock Tank Volume (L):

Amount in Stock Tank:

Unit:

Chemicals Added to Tank A:

Tank B Inputs

Fertiliser Name:

Molecular Wt. (g/mol):

Stock Tank Volume (L):

Amount in Stock Tank:

Unit:

Chemicals Added to Tank B:

Tank A Results (100x Concentrate)

Fertiliser & Elemental Contribution (Diluted mg/L)	Amount in Stock Tank	MW (g/mol)	Stock Conc. (mg/L)	Stock Conc. (mmol/L)	Diluted (1:100) Conc. (mg/L)	Diluted (1:100) Conc. (mmol/L)

Tank B Results (100x Concentrate)

Fertiliser & Elemental Contribution (Diluted mg/L)	Amount in Stock Tank	MW (g/mol)	Stock Conc. (mg/L)	Stock Conc. (mmol/L)	Diluted (1:100) Conc. (mg/L)	Diluted (1:100) Conc. (mmol/L)

Combined Nutrient Profile of Final Diluted Solution (1:100)

Element	Total Diluted Conc. (mg/L)	Total Diluted Conc. (mmol/L)

Ion Balance (mEq/L) of Final Diluted Solution

Total Cations (mEq/L)

0.00

Total Anions (mEq/L)

0.00

Difference

0.00

Calculation based on Formula 1 & 2 from document (p. 21). Excludes chelates. A difference near zero indicates a well-balanced solution.

Plant Nutrient Solution Suggestions

Select a crop, growing system, and situation to view its suggested nutrient solution template based on the "Nutrient Solutions for Greenhouse Crops" document. These are example recipes and may need adjustment based on specific growing conditions and water quality. All stock tank recipes assume 1000L tanks at 100x concentration.

Select Crop:

Key Principles for A/B Tank System (Source: Document Chapter 9)

To prevent precipitation, calcium-containing fertilizers must be kept separate from those containing phosphate and sulphate.
Typically, Tank A is used for calcium fertilizers, while Tank B is used for phosphate and sulphate fertilizers.
Fertilizers like potassium nitrate, magnesium nitrate, ammonium nitrate, and nitric acid can be dissolved in either Tank A or Tank B. The distribution should consider the overall balance and solubility of all ingredients in each tank.
Micronutrients supplied as sulphate salts are generally added to Tank B.
Chelated micronutrients can be added to either tank. However, if significant amounts of acid are used (potentially lowering pH considerably in one tank), it is preferable to add chelates to the tank with the more stable pH, often Tank A if Tank B contains acids. Chelates, especially EDDHA and HBED types, can degrade at pH levels of 3.5 or lower. If acids are necessary, quantities in the tank with chelates (especially Tank A) should be limited, with the remainder in the other tank.
The pH of stock solutions should generally be below 5 for Tank B and between 3.5-5 for Tank A to ensure complete dissolution of fertilisers.

Calculation Formulas Used (Interactive Calculator):

Amount in grams (amount_g): User input amount, converted to grams if initially in kg (amount_kg * 1000).
Stock Concentration of Fertiliser (mg/L): (amount_g / Stock_Tank_Volume_L_Input) * 1000.
Stock Concentration of Fertiliser (mmol/L): (Stock Conc. Fertiliser mg/L) / (MW of Fertiliser g/mol).
Diluted Concentration of Fertiliser (mg/L): (Stock Conc. Fertiliser mg/L) / User_Dilution_Factor.
Diluted Concentration of Fertiliser (mmol/L): (Stock Conc. Fertiliser mmol/L) / User_Dilution_Factor.
Diluted Elemental Concentration (mg/L): (Diluted Conc. Fertiliser mg/L) * (percentage_of_element_in_fertiliser / 100).
Diluted Elemental Concentration (mmol/L): (Diluted Elemental Conc. mg/L) / (Atomic Weight of Element).

Disclaimer: This program is for illustrative and calculation purposes. Always verify calculations and consult with agricultural experts for precise nutrient management. Ensure correct molecular weights and fertiliser purities are used. The concentrations calculated refer to the entire fertiliser chemical, not individual elements, unless specified in the elemental breakdown.