Deep application of chemical fertilizer is the main factor to improve the benefit of chemical fertilizer.

Deep application of chemical fertilizer is a fertilization method based on crop fertilizer requirement law and soil properties, using formula fertilization technology and fertilizer rhizosphere effect principle, applying chemical fertilizer to a certain depth in order to facilitate better absorption of crops, reduce chemical fertilizer volatilization loss and improve chemical fertilizer utilization rate. The effect of mechanized deep fertilization is more ideal. Mechanized deep application of chemical fertilizer is to complete the deep application of chemical fertilizer at the same time in the process of mechanized ploughing, land preparation, sowing and intertillage, and control the depth, position and quantity of fertilizer by mechanical methods. Because chemical fertilizer is deeply applied in the effective rhizosphere of crops, it is beneficial for crops to absorb better and reduce volatilization loss caused by surface or shallow application of chemical fertilizer. The average utilization rate of nitrogen fertilizer can be increased from 30% to 40%. Deep application of phosphorus and potassium fertilizer can reduce the loss of wind erosion, promote absorption and prolong fertilizer efficiency. The yield increase rate can generally reach 5%-15%. Mechanized deep application can also avoid burning seeds, improve efficiency and reduce pollution. Chemical fertilizer deep application can be divided into three categories:

Deep application of base fertilizer

There are two methods of deep application of base fertilizer: one is to spread fertilizer first and then plough; the other is to apply chemical fertilizer to the plough while ploughing, and the second method is better. Fertilization depth 6 cm, fertilizer belt width 3-5 cm, uniform and continuous fertilizer, no obvious broken strip.

Deep fertilization

Deep application of seed fertilizer requires a certain thickness between seed and fertilizer, generally more than 3 cm, to meet the nutrient requirements of crop seedling growth and avoid the risk of burning seeds and seedlings.

topdressing and deep application

Topdressing deep application is between 10-20 cm from both sides of the plant row, take the method of opening small grooves or drilling holes, the depth should be 6-10 cm, the fertilizer width should be more than 3 cm, pay attention to covering soil after fertilization.