In recent years, due to the lack of organic fertilizer input and people’s demand for increased yields, the amount of fertilized corn has increased significantly, and the area of ​​application of some high-concentration compound fertilizers has also been expanding, which has effectively promoted the increase in yield, but it is also common. There is fertilizer, deficiency of disease at the seedling stage, or reduction of yield during the later period. Farmers need to understand the essentials of rational fertilization of spring corn.

Spring corn fertilization should grasp four main points:

(1) To determine a reasonable proportion of nitrogen, phosphorus and potassium fertilizers, and strive to balance fertilization. Maize absorbs more nitrogen, more potassium and less phosphorus throughout its life. Absorption of nitrogen, phosphorus, potassium ratio is generally 100: 37: 84, combined with higher nitrogen, potassium utilization, phosphorus utilization is low, in the fertilization should focus on nitrogen, appropriate amount of phosphorus, potassium, suitable The proportion of nitrogen, phosphorus and potassium applied is roughly 100:60:40, and the formula fertilization will be implemented. Firstly, corn fertilization index system under different fertility levels was formulated according to the requirements of fertilizer, soil fertility and fertilizer effect of maize and field experiments and soil test results. Based on this, formulate fertilization partition maps and formula fertilization plans.

(2) To determine a reasonable amount of fertilization, to produce fertilizer, to fertilize the soil fertility, 1 kg of nitrogen, phosphorus, potassium and pure nutrients can increase production of 8-10 kg of grain, generally every 100 kg of grain, soil The production capacity is calculated as 60%, requiring 3.43 kg of pure nitrogen (converted to 46% urea 7.5 kg), phosphorus 1.23 kg (converted to 16% superphosphate 7.7 kg), potassium 2.36 kg (converted to 60% potassium chloride 3.9 kg) .

(3) The frequency of fertilization should be scientifically formulated, and every time the fertilizer supply should be made effective and reasonable, the fertilizer, seed fertilizer, and top dressing should be used in conjunction with the application. According to the actual situation in my county, the basic fertilizer can be applied to the application of 1000-1500 kg of organic fertilizer on the basis of fertilizer can choose 15 nitrogen ~ 15 phosphorus ~ 15 potassium (general type), 20 nitrogen ~ 15 phosphorus ~ 5 potassium (middle or more fertile ground ) Or 16 nitrogen ~ 12 phosphorus ~ 12 potassium (low or barren) 20 ~ 25 kg, large bell-mouth topdressing urea 20-25 kg, head urea catch 10-15 kg. In order to meet the demand for nutrients in different growth periods, prevent the defertilization to reduce waste and make the fertilizer play a greater benefit.

(4) Reasonable fertilization method should be adopted to effectively avoid the harm of fertilizer and to exert the fertilizer effect. The application of base fertilizer should be combined with organic fertilizer and chemical fertilizer. The fertilization method can be applied before arable land can also be combined with deep turning.

The seed fertilizer should be strictly separated from the seed or strictly limited to diammonium phosphate. The application amount of mu is less than 5 kg, and it can be mixed with the corn seed.

Top dressing should be at jointing and booting stage, that is, small bell-to-big mouth period (9 to 12 leaves), 10 to 15 cm from the base of the stem, and the mechanical side applied to 10 to 15 cm deep, or people and storage capacity to open the ditch Article Shi, cave facilities and timely cover soil.

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