What Are the Characteristics of Commonly Used Phosphate Fertilizers?
(1) Water-soluble phosphate fertilizer is suitable for various soils and various crops, but is preferably used for neutral and calcareous soils. Among them, ammonium phosphate is a nitrogen-phosphorus binary compound fertilizer, and the phosphorus content is high, which is 3-4 times that of nitrogen. When applied, except for legume crops, most crops must be directly applied with nitrogen fertilizer, and the proportion of nitrogen and phosphorus should be adjusted. Otherwise, it will cause waste or reduce production due to improper application of nitrogen and phosphorus.
(2) Miscible phosphate fertilizer is most suitable for application in dry land, and it is easy to cause denitrification loss in paddy field and acid soil application.
(3) The soluble phosphate fertilizer is insoluble in water, but it can be dissolved by weak acid in the soil and then absorbed and utilized by the crop. In the calcareous alkaline soil, it combines with calcium in the soil to convert to the poorly soluble phosphoric acid, reducing the effectiveness of phosphorus, and therefore, is suitable for application in acidic soil.
(4) After the insoluble phosphate fertilizer is applied to the soil, it is mainly dissolved by the acid of the soil, which becomes a form that the crop can utilize, and the fertilizer effect is very slow, but the aftereffect is very long. It is suitable for acidic soil and can be used as base fertilizer. It can also be applied with organic fertilizer heap rot or with chemical acid and physiological acid fertilizer. The effect is better.