The crops that require special attention for preparing fertilizer as early as possible in spring are mainly: early spring crops such as northern spring wheat and potatoes that need to be sown; weak seedling winter wheat that needs to be topdressed back to green fertilizer; and winter wheat, winter rape, citrus and other crops that require early spring fertilization in the Yangtze River Basin; Greenhouse or greenhouse vegetables. Spring sown crops must be combined with soil preparation and application of base fertilizer. It is required to prepare decomposed farm manure as soon as possible; if urea is used as base fertilizer, it must be applied in advance to make it have a microbial transformation process in the soil. In short, the word "early" should be highlighted in the spring fertilizer preparation, and the fertilizer should be prepared at least 15-20 days before sowing.
We have all the fertilizers we need in spring, including organic fertilizers and chemical fertilizers, compound fertilizers and elemental fertilizers. It is necessary to combine local characteristics and own needs, and prepare all necessary fertilizers. For example, spring crops should be combined with the application of base fertilizer before spring plowing. Generally, compound fertilizers are required, or urea, superphosphate, potassium chloride, etc. are combined with nitrogen, phosphorus, and potassium elemental fertilizers. Some also need to apply appropriate amounts of medium and trace amounts. Elemental fertilizers; organic fertilizers are recommended for field crops, but for fruit trees and vegetables, they must be applied, and they must be prepared in advance; greenhouse vegetables and fruit trees are different from field crops, even if it is topdressing in spring, it is necessary to apply compound fertilizer or nitrogen and phosphorus Cooperate with potash fertilizer.
In terms of fertilizer types and nutrient distribution ratios, choose fertilizers that are suitable for the characteristics of your own soil and crops. For example, rice, wheat, corn, cotton, rapeseed and other field crops generally require 2 times or more nitrogen in each season. About half of the nitrogen is used as base fertilizer, and the other half is used as topdressing. Therefore, the base fertilizer for these crops Compound fertilizers with similar distribution ratios of nitrogen and phosphorus should be used; if it is a one-time fertilization, a compound fertilizer with a nitrogen and phosphorus ratio of about 2:1 should be used, and the amount of fertilization should be appropriately increased compared with the amount of basal fertilizer applied in batches. The ratio of potassium in compound fertilizer mainly depends on the region, in which the proportion of calcareous soil in the north is lower, and the proportion of acid soil in the south is higher.
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