As soon as possible is to prepare the fertilizer as soon as possible. The crops that need special attention in spring fertilizer preparation are mainly: early spring crops such as spring wheat and potato in the north; 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 for 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 a few days in advance to make it have a microbial transformation process in the soil. In short, the spring fertilizer preparation should highlight the word "early", not "temporarily embracing the Buddha's feet", the fertilizer should be prepared at least 15 to 20 days before sowing.
Fully means that there are many kinds of fertilizers needed 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 are mostly combined with the application of base fertilizer before spring plowing and sowing. Generally, compound fertilizers are required, or combined application of urea, superphosphate, potassium chloride and other nitrogen, phosphorus, and potassium elemental fertilizers. Some also need to apply an appropriate amount of medium fertilizer. Microelement fertilizers; organic fertilizers are recommended for field crops, but must be applied to fruit trees and vegetables, and 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.
The counterpart is to choose fertilizers suitable for the characteristics of your own soil and crops in terms of fertilizer types and nutrient distribution ratios. 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 nitrogen and phosphorus nutrient distribution ratios should be selected; if it is a one-time fertilization, such as layered fertilization under mechanized conditions in the northwest arid agricultural area and northeast, 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 stages. The proportion of potassium in compound fertilizers mainly depends on the region. 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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