Corn production should be scientifically fertilized

Corn is a high-yield crop, which requires a large amount of fertilizer. It must be rationally fertilized to meet the nutrient needs of corn throughout its growth period. According to the survey, the production of 100 kg of corn seeds requires 2.5 kg of nitrogen, 1 kg of phosphorus, and 2.1 kg of potassium. If the yield per mu is 500 kg of corn, the acre needs about 33 kg of urea, or 50 kg of ammonium nitrate, 31 kg of superphosphate, and 13 kg of potassium sulfate. In the three stages of corn growth, the proportion of fertilizer needed is different. The seedling stage accounts for 2% of total fertilizer, the ear stage accounts for 85%, and the grain stage accounts for 13%. From the jointing to the big glutinous period, the corn is the peak period of fertilizer demand. Therefore, according to the amount of fertilizer needed and the fertilizer requirement, it is necessary to apply rational fertilizer, that is, the combination of bottom fertilizer, seed fertilizer and topdressing; nitrogen fertilizer, phosphate fertilizer and potassium fertilizer combination. ; combination of agricultural fertilizer, fertilizer, biological bacteria and fertilizer. The base fertilizer should be applied. This is the basis. Generally, 2000 kg of organic fertilizer is applied to the mu, the phosphorus pentoxide is 7 郾 5 kg, and the potassium fertilizer is 5 郾 5 kg. In order to improve corn yield and improve quality, it is necessary to grab pre-emptive early in production and carry out reasonable fertilization. Topdressing should be done with “less meals”, when do you need to chase, what needs to be chased, how much to chase, and how much The need for nutrients in corn growth and development. In the bottom fertilizer, the level of seed fertilizer application is not high, the soil fertility conditions are poor, and the plots of late-maturing varieties can be planted in the 6-7 leaf stage of corn, and the fertilizer is about 15 kg of urea, and the depth of 15 cm or more to improve the fertilizer. Utilization rate; the base fertilizer and the fertilizer are applied to the land with high level, and the urea is about 10 kg. Corn topdressing should be carried out as soon as possible, generally combined with two times of shovel, for topdressing, the method is front dressing, behind the squatting, topdressing and sorghum combination, reduce volatilization, improve fertilizer utilization; second, use hoeing pit, deep pursuit of 15 cm Above, play the fertilizer effect; the third is to use the top dressing device, deep pursuit of 15 cm or more, when topdressing, combine fertilizer and biological fertilizer to promote the good development of the root system. Under normal circumstances, the urea is 10-15 kg of urea, plus 1 kg of biological fertilizer. It can activate the soil and mature early. In the filling stage of heading stage, 0.25 kg of potassium dihydrogen phosphate and 0.5 kg of urea are used, and 50 kg of water is sprayed on the foliar surface to prevent baldness and lack of grain, increase yield and improve quality. Organic food corn, can not use fertilizer, it is best to use fermented organic fertilizer, base fertilizer, topdressing fertilizer, fertilizer effect is stable and lasting, the effect is better than chemical fertilizer, and the stamina is long, but when topdressing, cake fertilizer and crop seedlings maintain an appropriate distance, so as not to avoid The heat generated by the fermentation of the cake fertilizer burns the seedlings.

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