Fertilizers containing more than one nutrient are called composite fertilizers; They contain nitrogen, phosphorus, potassium. The first digit in its content is nitrogen, the second digit is the amount of phosphorus in %. at 100 kilos; There are 20 kilos of pure Nitrogen, 20 kilos of (P2O5) Phosphorus. All of the Nitrogen it contains and most of the Phosphorus (P2O5) Phosphorus (90%) is easily taken up by the plants since it is completely dissolved in water.
All of the nitrogen in compound fertilizers can be in the form of ammonium or some of it can be found in the form of nitrate. It is used together with the seed before or during planting since it has a high solubility in water. It is a fertilizer that is easy to apply to the field surface; The fact that the field is well prepared increases the effect even more. It is very suitable for mechanical fertilization due to its prill particles. The amount of use depends on the type of agriculture, climate and soil condition. Phosphorus need of the plant to be grown should be taken into account in calculating the amount to be given. If it is not given enough, the root development of the plants will be weak, the height will be short, the ripening will be delayed, the fruits will fall and the yield will decrease.
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