The Rational Distribution of Nitrogen Fertilizer

The rational distribution of nitrogen fertilizer should be based on soil conditions, the nitrogen nutrient characteristics of the crop and the characteristics of the fertilizer itself. Soil conditions: Soil conditions are a prerequisite for fertilizer zoning and distribution, and are the basis for determining nitrogen fertilizer varieties and their application techniques. It is preferred to assign nitrogen fertilizer to areas with medium and low fertility. Alkaline soils may be acid or physiologically acidic, such as ammonium sulfate or ammonium chloride. Acidic soils should be alkaline or physiologically alkaline fertilizers such as citric acid, sodium, calcium nitrate, etc. It is not advisable to distribute ammonium chloride in saline-alkali soil, and urea is suitable for all soils. The ammonium nitrogen fertilizer should be distributed in the rice area and applied deep in the reducing layer. The nitrate nitrogen fertilizer should be applied to the dry land and should not be distributed in areas with excessive rainfall or rice. “Early field” should master the principle of light weight, heavy weight and small number of times in order to prevent post-fertilization of crops. “Late field” should pay attention to early seedlings in early stage, and prevent excessive nitrogen fertilizer in the late stage, resulting in plant greed and lodging. The nitrogen fertilizer on the soil with heavy texture can be applied at one time, and the sandy soil should be applied several times.