Mono Ammonium Phosphate (MAP) (12-61-0) Calculator & Dosage Guide

Mono Ammonium Phosphate 12-61-0 is a high-analysis, highly soluble phosphorus starter fertilizer ideal for fertigation and root development in young seedlings.

Nitrogen12N
Phosphate61P₂O₅
Potash0K₂O
Solubility:370 g/L
Standard Temp:20°C

Pre-configured Mono Ammonium Phosphate (MAP) Calculator

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Calculated Recipe Output

Configure your targets and click "Run Analysis" to generate your fertilizer recipe.

1. What is Mono Ammonium Phosphate (MAP)?

Mono Ammonium Phosphate (MAP) is a high-grade chemical source supplying essential plant nutrients. The standard NPK ratio of this fertilizer is 12-61-0, which signifies that it contains 12% Nitrogen (N), 61% Phosphorus as P₂O₅, and 0% Potassium as K₂O by total product weight. Under agronomic standards, the phosphorus and potassium components are expressed in their oxide forms rather than elemental phosphorus and potassium.

When dissolved in water, this fertilizer dissociates into plant-available ionic nutrients. This allows roots to absorb them instantly via active transport. Understanding the exact composition prevents chemical lockouts and guarantees optimal nutrient concentrations.

2. Best Used For

This fertilizer is highly effective when applied to crops and systems requiring quick, specific nutrient supply:

  • Hydroponic Tomato
  • Maize (Corn)
  • Potato
  • Lettuce
  • Pepper

3. Solubility & Mixing Instructions

At a standard temperature of 20°C, the maximum solubility limit of Mono Ammonium Phosphate (MAP) is 370 grams per liter of water. Attempting to mix at concentrations above this threshold will result in precipitation, leaving undissolved particles at the bottom of your reservoir or mixing tank.

Step-by-Step Dissolution Method

  1. Fill your clean mixing vessel or reservoir with 70% of the total target water volume.
  2. Using a digital scale with at least 0.1g precision, weigh out the required amount of Mono Ammonium Phosphate (MAP) calculated above.
  3. Gradually pour the dry fertilizer granules into the water while continuously agitating or stirring.
  4. Stir until the crystals are completely dissolved, then top off the vessel with water to reach the final 100L volume.
  5. Measure the Electrical Conductivity (EC) or Total Dissolved Solids (TDS) using a calibrated meter to verify target ppm.

4. Chemical Compatibility & Warnings

To prevent chemical reactions that render nutrients unavailable to plants, observe the following compatibility constraints:

Do not mix with Calcium Nitrate or other calcium inputs in concentrated tanks to prevent calcium phosphate precipitation.

Slightly acidic; check solution pH when mixing in large quantities.

5. Related Fertilizers

Compare or blend Mono Ammonium Phosphate (MAP) with other high-grade fertilizer materials to complete your custom recipe: