According to the characteristics of soil, crops and growth period, the fertilizer on the road should be used. For example, organic fertilizers must be applied to vegetables, fruit trees, and economic crops. Organic fertilizers should be applied to field crops as much as possible. Because organic fertilizers need to be cooked, they should be prepared in advance. Phosphorus and potassium fertilizers are mainly used as base fertilizers for field crops and fruit trees and vegetables. Basal fertilizer is used as top dressing. Among the acidic soils in the south, phosphate fertilizers such as calcium superphosphate or calcium magnesium phosphate containing calcium, magnesium sulfur, etc. can be preferentially used. In calcareous soils in the north, the quick-acting phosphate fertilizers containing phosphoric acid such as diammonium phosphate or phosphorus-containing chemical fertilizers are preferred. The selection of potash fertilizer mainly depends on the chlorine tolerance of crops. Sugar beets, spinach, rice, wheat, and corn are not sensitive to chlorine, but potassium chloride, which is inexpensive and has a high nutrient content, can be used preferentially, while tobacco, potato, and berry are not chlorine-reserved. Potassium sulfate should be used for crops and saline soils. The selection of potash fertilizer depends on the local rainwater or irrigation conditions. In places where it is rainy or has irrigating conditions, potassium chloride may be used in the base fertilizer in an appropriate amount, and potassium sulfate may be used in places with drought, salinization, or vegetable greenhouses. it is good.
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