There are many kinds of phosphate fertilizer. Generally, it is necessary to select the suitable phosphate fertilizer according to the nature of soil and the type of crop.
Different soil properties Phosphate fertilizer is different:
South China is acidic soil, while the north is alkaline calcareous soil, the general choice of phosphate fertilizer law, acid soil alkaline phosphate, alkaline soil acid phosphate.
The standard (mg / kg) of available P in acid soil is: 0-15 is low; 16-30 is medium;> 30 is high. The standard (mg / kg) of available phosphorus in calcareous soils is: <6 is low; 6-10 is medium;> 10 is high. When the content of soil available phosphorus is low, it shows that phosphorus deficiency is serious and phosphorus deficiency is serious, and phosphorus fertilizer has obvious or very obvious effect. When soil available phosphorus is moderate, it shows that phosphorus fertilizer has certain effect; when soil available phosphorus content is high , Indicating that the soil rich in phosphorus, phosphorus fertilizer effect is often not obvious. However, for high-yielding fields, the soil available phosphorus content is high, but also should take into account the principle of nutrient balance, so appropriate application of a small amount of phosphate fertilizer is necessary.
At the same time if the choice of water-soluble phosphate fertilizer, in the course of the application amount should be less; weak acid soluble phosphate fertilizer can be more.
Crops different phosphate fertilizer is different.
For the crops to be high-yielding, the need for precision fertilization, the general crop nitrogen, phosphorus and potassium have an optimal ratio, such as corn, wheat, rice, rape and other crops in the ratio of nitrogen and phosphorus fertilizer 2: 1 or 3: 1, crop fertilization In a certain kind of nutrients, with a reasonable need to use, in order to promote each other and improve crop yields.
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