The fertilizer for the road should be selected according to the characteristics of soil, crop and growth period. For example, vegetables, fruit trees and cash crops must be applied with organic fertilizers. Field crops should be applied with organic fertilizers as much as possible. Because organic fertilizers need to be decomposed, they should be prepared in advance; phosphorus and potassium fertilizers are mainly used as fertilizers for field crops, for fruit trees and vegetables. The base fertilizer is also used as a top dressing. Among the southern acid soils, phosphate fertilizers such as superphosphate or calcium magnesium phosphate containing calcium, magnesium and sulfur may be preferred, and quick-acting phosphate fertilizers or phosphate fertilizers with higher nutrient concentrations such as diammonium phosphate may be used in the northern calcareous soil; The choice of potash is mainly regarded as the chlorine resistance of the material. Beet, spinach, rice, wheat, corn and the like are not sensitive to chlorine. It is preferred to use potassium chloride with low price and high nutrient content, while tobacco, potato, berry, etc. avoid chlorine. Potassium sulphate should be used for crops and saline soils. The choice of potash fertilizer depends on the local rainwater or irrigation conditions. In areas with heavy rain or irrigation conditions, potassium chloride can be applied in the base fertilizer. In the dry or rainy, saline-alkali or vegetable greenhouse, potassium sulfate is used. it is good.
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