NPK Fertilizers

NPK rating, also known as N-P-K, is used to label fertilizers based on the relative content of the chemical elements nitrogen (N), phosphorus (P), and potassium (K), which are commonly used in fertilizers. These three elements promote plant growth in distinct ways:

1. Nitrogen (N) promotes the growth of leaves and vegetation.
2. Phosphorus (P) promotes root and shoot growth.
3. Potassium (K) promotes flowering, fruiting, and general hardiness.

It's important to note that, unlike the N number, the numbers for P and K do not reflect the amount of elemental phosphorus and potassium in the fertilizer. Instead, they represent the amount of oxide in the form of P₂O₅ and K₂O that would be present in the fertilizer if all the elemental phosphorus and potassium were oxidized into these forms.