Organic fertilizers include all substances that can be used as fertilizers except for chemical fertilizers, usually based on human and animal waste, crop straw, and green manure. The organic fertilizer has comprehensive nutrient and long-lasting balanced fertilizer effect. It can not only improve soil structure, improve soil fertility, promote soil nutrient release, but also supply crop nutrients, especially for the development of organic agriculture, green agriculture and pollution-free agriculture. However, there are many types of organic fertilizers, and their functions are different. In the autumn season, the application should be scientific and avoid blind application.
The following points should be noted in the application: organic fertilizer nutrients are not balanced. Organic fertilizers contain many nutrients, which are superior to single fertilizers, but they contain nutrients that are not balanced and cannot meet the needs of high yield and quality of crops. When applying organic fertilizer, the fertilizer should be applied according to the nutrient requirements of the crop. Even the farmland producing green food should be applied with appropriate amount of mineral fertilizer, and various foliar fertilizers should be applied during the growth of the crop.
Organic fertilizers have low nutrient content. Although organic fertilizers contain more nutrients, they have lower nutrient content and slower decomposition in the soil. It is difficult to meet the nutrient requirements of crops when the amount of organic fertilizer applied is not large.
The chemical fertilizer has high nutrient content and rapid fertilizer efficiency, which can be supplemented according to the amount of crop demand, but the fertilizer efficiency period is short. In order to obtain high yield, organic fertilizer should be combined with chemical fertilizers to make up for each other's strengths, and to meet the needs of various nutrients in the quantity and time.
Organic fertilizers need to be fermented. Many organic fertilizers contain pathogens, eggs and weed seeds. Some organic fertilizers contain organic compounds that are not conducive to crop growth. Therefore, they should be applied after being fermented and processed, and the manure cannot enter the ground.
There are contraindications to the application of organic fertilizers. Fully decomposed organic fertilizer should not be mixed with alkaline fertilizer to avoid ammonia volatilization and reduce nutrient content of organic fertilizer. Organic fertilizers contain more organic matter and should not be mixed with nitrate nitrogen fertilizer. (Zhou Shijun)
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