npk compound fertilizer 15-5-5

详情

1. NPK compound fertilizer is the fertilizer which contains two or three nutrients of N, P, K.

 2. it can be used as basic application, seed manure and additional application.

 3. it is widely used for all kinds of foodstuff crops and economic crops. 

We produce kinds of npk compound fertilizer according to customer's requirment.

The labeling of fertilizers varies by country in terms of analysis methodology and subsequent nutrient labeling. In most countries the macronutrients are labeled with an NPK analysis.

The three numbers on the fertilizer label represent an analysis of the composition by weight. These three numbers correspond to nitrogen, phosphorus, and potassium (N-P-K) and always appear in that specific order. When a 4th number is included, it indicates the sulfur content (N-P-K-S).

While the number for "N" represents the percentage weight of nitrogen, the other two components are not for the analysis of the element, but rather, the analysis of the "available" or "soluble" form of the element. In traditional chemical analysis, the tests used treated the sample so as to measure the equivalent P2O5 and K2O. For instance, some potassium-bearing rocks do not count as having available potassium.

The number for "P" is actually the weight of an equivalent quantity of P2O5 and not elemental phosphorus. In order to calculate the weight of P in the formulation, the weight of P2O5 can be multiplied by 0.*4 to compensate for the weight of the oxygen in the molecule. For example, a bag of *******0 has *0 pounds of nitrogen, *0 pounds of P2O5, but only 4.4 pounds of P.

Likewise, the number for "K" is actually the weight of an equivalent quantity of K2O, and not elemental potassium. In order to calculate the weight of K in the formulation, the weight of K2O can be multiplied by 0.*3 to compensate for the weight of the oxygen in the molecule. For example, a bag of *******0 has *0 pounds of K2O, but only 8.3 pounds of K.