How to scientifically apply nitrogen fertilizer

The scientific application of nitrogen fertilizer should pay attention to the following points:

According to the characteristics of various nitrogen fertilizers to be treated differently. Ammonium bicarbonate and ** volatile losses, suitable for deep application of basal fertilizer; nitrate nitrogen fertilizer in the soil mobility, rapid fertilizer effect, is a good top-dressing of dry fields; general paddy fields can be used as top-dressing nitrogen fertilizer or urea. Some fertilizers are toxic to the seeds, such as urea, ammonium bicarbonate, **, lime nitrogen, etc., and should not be used as seed fertilizers; ammonium sulfate, etc., although it can be used as a fertilizer, the amount should not be excessive, and the fertilizer and the seeds should preferably have soil isolation. In arid regions with less rainfall, nitrate leaching problem is not prominent. Therefore, it is appropriate to apply nitrate nitrogen fertilizer. It is better to apply ammonium nitrogen fertilizer and urea in rainy areas or rainfall seasons.

To deep nitrogen fertilizer. The deep application of nitrogen fertilizer can reduce the direct volatilization of fertilizers, loss of water, nitrification and denitrification. Deep fertilization is also conducive to the development of roots, deep rooting, and expanding the nutritional area.

Reasonably apply other fertilizers. The combined application of nitrogen fertilizer and organic fertilizer plays an important role in seizing high yield, stable yield, and reducing costs of crops. This can not only meet the overall needs of crops for nutrients, but also can fertilize the soil. Combined application of nitrogen fertilizer and phosphate fertilizer can increase the use of nitrogen and phosphorus, especially in soils with low soil fertility, and nitrogen and phosphorus fertilizers have better effects. In the soil with insufficient effective potassium content, the combination of nitrogen fertilizer and potash fertilizer can also increase the effect of nitrogen fertilizer.