What are the different effects of different fertilization methods?

Fertilizer application method in the soil when the way and way. The basic requirements for the scientific fertilization method are: apply the fertilizer as much as possible to the soil layer that the crop root can easily absorb, increase the utilization rate of the fertilizer to the crop, and select the appropriate location and method to reduce the fixing, volatilization, and leaching of the fertilizer. Fertilization methods vary according to different crops, fertilization periods, and fertilizer properties. The most common methods are spreading, spraying, applying radium and fertilizing roots. 1 Spreading and spreading applicator is a method of spreading manure evenly on the fields by artificial or mechanical means. It is fertilized on the topsoil and mainly meets the needs of crops when the root system of seedlings is shallowly distributed. This method is commonly used when basal fertilizers are applied to farmlands that are not normally planted or when top-planted food crops are topdressed. Spreading soil and soil cultivation measures can increase the uniformity of soil and fertilizer mixing, which is conducive to the extension and early absorption of crop roots. However, in the absence of soil moisture, dry ground, or low planting density, there are no other measures to mix the fertilizer with the soil. The applied fertilizer is easily washed away by rainwater or irrigation water, resulting in volatilization losses and easily absorbed by surface weed seedlings. . The method of applying fertilizer into strips is applied to the soil between rows of crops. Concentration of fertilizing material is applied to the strips to facilitate the application of fertilizer to the root layer of crops, and it can be combined with irrigation and spreading to achieve the purpose of deep application. Deep application is a method that is strongly promoted when chemical fertilizers are used. In most of the conditions, the fertilization materials should be applied after the ditch is opened and covered with soil, which will help improve the fertilizer efficiency. In dry conditions or dry seasons, the combination of strip fertilization is better. Two points are planted in the planting position or in the planting hole, or in the seedling stage in the growing period of the crop. The general depth of the hole is 5~10 cm, and the soil is applied after the application. Acupoint application is a method that can concentrate the application of chemical fertilizers more than the application. In order to avoid damage to crop roots, generally less chemical fertilizer is applied, and the proper position and depth are maintained with the crop root system. After fertilization, the combined application of irrigation water before overburdening results in better chemical fertilizer application. 3 rounds of fertilization and radial fertilization The fertilization and radial fertilization are based on the main stem of the crop and are fertilized in a round or radial manner. This method is generally used for perennial woody crops, especially fruit trees. These crops have low density and long distances. It is difficult to make full use of chemical fertilizers and crop root systems, and fertilizer utilization is not high. 4 Top-dressing Fertilizer This is the method of applying chemical fertilizers to the crop's stems and leaves. The use of topdressing fertilizers outside the roots is small and the fertilizer effect is fast. It is an auxiliary fertilizer measure. For a large number of nitrogen, phosphorus, and potassium elements, the root absorption is weak at the later stage of crop growth, and it can be used to supplement nutrient absorption in a timely manner. It is better for trace elements to recover from the roots. However, top dressing can not be used as a substitute for soil dressing. The climate conditions have a great influence on the effect of top dressing.

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