In recent years, due to the lack of organic fertilizer input and people's demand for increased yield per unit area, the amount of corn used has increased significantly, and the application area of ​​some high-concentration compound fertilizers has been continuously expanded, which has led to an increase in production. However, there are also frequent occurrences of fertilizer damage, deficiency syndrome or post-fertilization and yield reduction. The application of fertilizer to spring corn should be determined as follows:
   First, determine the appropriate ratio
   To determine a suitable proportion of nitrogen, phosphorus, potassium fertilizer application, to achieve balanced fertilizer. The ratio of nitrogen, phosphorus and potassium absorption is about 100:37:84 . The use of nitrogen and potassium is relatively high, and the utilization rate of phosphorus is relatively low. In terms of fertilizer, it should be supplemented with nitrogen and appropriate amount. Supplementation of phosphorus and potassium application, reasonable application ratio of nitrogen, phosphorus and potassium is roughly 100:60:40 , and strive to implement formula fertilization.
   Second, determine the amount of high-yield fertilization
   To determine a suitable amount of fertilizer, it is necessary to use the yield to determine the fertilizer, and the fertility of the soil to determine the amount of fertilizer. 1 kg of nitrogen, phosphorus and potassium nutrients is possible to improve productivity in nutrient reach 8 kg to 10 kg of food, usually every 100 kilograms of grain, soil productivity calculated as 60 percent pure nitrogen requires 3.43 kg, P 1.23 kg, potassium 2.36 kg.
   Third, determine the appropriate number of fertilizers
   To make the fertilizer supply scientific and reasonable, it is necessary to do the combination of the bottom fertilizer, the seed fertilizer and the top dressing. Typically fertilizer was applied at 1000 kg to 1500 kg seed fertilizer organic fertilizer based on nitrogen can choose to use 15 -15 -15 potassium phosphate, potassium phosphate -5 -15 20 N or 16 N potassium phosphate -12 -12 20 kg to 25 In kilograms, 20 kg to 25 kg of urea are applied during the big bell period , and 10 kg to 15 kg of urea are chased during the earing stage .
   Fourth, determine the effect of high fertilizer method
   Scientific fertilizer technology should be adopted. The application of base fertilizer should be combined with organic fertilizer and fertilizer application. Fertilization techniques can be applied before the cultivated land, or the machine can be turned deep and the camera should be strictly separated from the seeds or strictly limited. The variety is diammonium phosphate, the average application rate per acre is 5 kg; the top dressing should be carried out at the jointing-pregnancy stage, that is, in the small bell mouth-big bell mouth period, 10 cm to 15 cm from the base of the stem , mechanical side application Apply deep to 10 cm to 15 cm.
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