Topdressing of crops

The core issue of fertilization technology is rational fertilization. The so-called rational fertilization is to scientifically match various fertilizers, so that the fertilization period is accurate and the amount of fertilizer applied is moderate. At present, about half of the fertilizer we applied to the ground has not been absorbed by the crops. One is to go with the water; the other is to convert into insoluble compounds and remain in the soil; the third is to convert into gas and run into the atmosphere. Therefore, in order to improve the utilization rate of fertilizer, it is necessary to understand various factors that affect fertilizer efficiency . Fertility status changes in soil characteristics and the characteristics of the crop species and variety, weather conditions in the temperature, humidity, moisture conditions, different fertilization methods (basal, seed fertilizer, fertilizer, applicator, banding, cyclic administration table Shi and deep application, etc., will directly affect the fertilizer effect. Therefore, according to different factors to choose fertilizer, it can be adapted to local conditions and rational application.

In the process of plant growth and development, there is often a period in which the absolute number of nutrients required is not large, but in this period, if the nutrient is insufficient, it will affect the development of the crop, even if it is later supplied with nutrients or It is also difficult to correct or compensate for the loss by taking other remedies . This period is called the critical period of crop nutrition.

In the period of crop nutrition development, fertilizers have the best nutritional effects. This period generally occurs during the period of vigorous growth and development of crops . During this period, the roots have strong ability to absorb nutrients, and the plants grow rapidly. In this period, fertilization, the effect of increasing yield is very obvious, and the economic benefits are high. This period is called the maximum efficiency period of crop nutrition.