How to effectively improve nitrogen use efficiency?

How to effectively improve nitrogen use efficiency? The main reasons for the low nitrogen use efficiency are the volatilization loss of ammonium nitrogen, the leaching loss of nitrate nitrogen and denitrification. There are five ways to improve nitrogen use efficiency: 1. Rational allocation: nitrogen should be applied to the soil with good yield increase effect. According to the test results, it is proved that the utilization rate is higher and the yield increase effect is remarkable on the barren and low-yield soil with good groundwater quality and low basic yield. 2. Deep application and soil covering: Deep application combined with soil covering can increase the adsorption of ammonium ions by soil, reduce volatilization, and have significant yield increase effect on ammonium nitrogen fertilizer. The fertilizer depth should be flexibly controlled in combination with crop variety characteristics and fertilizer application amount. For those with low fertilizer dosage and shallow root distribution, it is better to apply shallow fertilizer in the middle layer (6-12 cm deep); for those with large fertilizer dosage, developed root system, deep soil and wide distribution, it is appropriate to apply deep fertilizer in the bottom layer (12-15 cm deep). 3. Nitrogen fertilizer application due to crops: Different crop habits require different nitrogen fertilizers. Rice, corn (2324,3.00,0.13%) and other cereal crops, need more nitrogen fertilizer, should be appropriate. Legume crops, on the other hand, generally require only a small amount of nitrogen fertilizer at the beginning of growth before rhizobia does not work. There were differences in fertilizer tolerance among crops of the same species, and the varieties with fertilizer tolerance were slightly larger than those without fertilizer tolerance. The nitrogen requirement of the same crop at different growth stages is also different. Different crops respond differently to ammonium and nitrate nitrogen. Ammonium nitrogen and nitrate nitrogen were equally effective in cereal crops such as rice and maize. Yams prefer ammonium nitrogen. Tobacco loves nitrate nitrogen, and most vegetables love nitrate nitrogen. 4. Fertilization according to soil: Nitrogen fertilizer application must allow consideration of the characteristics of soil fertilizer supply and conservation. For the plots with deep soil layer and strong fertility protection, the base fertilizer shall be given priority to, and topdressing shall be applied once; for the sandy soil and leaking sand with poor fertility protection, the principle of eating less and eating more meals shall be adhered to, and the fertilizer shall be applied by times. 5, nitrogen, phosphorus and potassium and micro-fertilizer formula application: normal growth and development of crops, nitrogen, phosphorus and potassium and other coordinated supply of nutrients, according to local conditions, reasonable formula fertilization. Click for more nitrogen, phosphorus and potassium application techniques Click for more fertilizer application techniques