A bag marked 15-15-15 contains 15% nitrogen (N), 15% phosphate (P2O5) and 15% potash (K2O) by weight.
What each does
- Nitrogen (N): leaf and shoot growth, green colour.
- Phosphorus (P): roots, early growth, flowering and seed set.
- Potassium (K): water balance, stress tolerance, fruit quality and sugar.
Compare prices properly
A 50 kg bag of 46-0-0 (urea) holds 23 kg of nitrogen. Divide the bag price by the kilograms of nutrient to compare products fairly; the cheapest bag is not always the cheapest nutrient.
Match to need
Use a soil test to decide which nutrient is short. Applying a balanced blend everywhere often over-supplies one nutrient and under-supplies another.
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