Calcium Nitrate (15.5-0-0) Calculator & Dosage Guide

Calcium Nitrate is a highly soluble fertilizer providing fast-acting nitrate nitrogen and essential calcium, ideal for greenhouse crops, tomatoes, and hydroponic systems.

Nitrogen15.5N
Phosphate0P₂O₅
Potash0K₂O
Solubility:1200 g/L
Standard Temp:20°C

Pre-configured Calcium Nitrate Calculator

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Calculated Recipe Output

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

1. What is Calcium Nitrate?

Calcium Nitrate is a high-grade chemical source supplying essential plant nutrients. The standard NPK ratio of this fertilizer is 15.5-0-0, which signifies that it contains 15.5% Nitrogen (N), 0% 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
  • Pepper
  • Lettuce
  • Strawberry
  • Bermudagrass

3. Solubility & Mixing Instructions

At a standard temperature of 20°C, the maximum solubility limit of Calcium Nitrate is 1200 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 Calcium Nitrate 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:

CRITICAL: Never mix Calcium Nitrate with Sulfates (like Magnesium Sulfate or Potassium Sulfate) in a concentrated stock tank to prevent Gypsum precipitation.

Do not mix with concentrated Phosphate solutions (like MAP or DAP) in the same stock tank.

5. Related Fertilizers

Compare or blend Calcium Nitrate with other high-grade fertilizer materials to complete your custom recipe: