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The land with a yield of more than 500 kg per mu, 35-38 kg of urea, 20-23 kg of super-calcium phosphate; 400-500 kg of land per mu, 25-35 kg of urea, and heavy superphosphate 17- 20 kilograms; plots of 300-400 kilograms per mu, 17-24 kilograms of urea, 12-17 kilograms of superphosphate. For plots with a yield of more than 400 kg per mu, 12-16 kg of potassium sulfate should be added per mu.
In addition, when the NPK nut nutrient is insufficient in the late growth stage of corn, it can be filtered in the grain filling period with 1 kg of urea and 0.1 kg of potassium dihydrogen phosphate (or 1-1.5 kg of superphosphate), and then the supernatant is filtered out, potassium chloride or Potassium sulfate 0.5 kg), combined with strong spikes on 50-60 kg of water spray. When zinc is deficient, 0.1-0.15 kg of zinc fertilizer can be used, and 60-75 kg of water can be sprayed. The spraying time is good on sunny days. If the sun is shining, it should be sprayed after 3 pm. The rainy weather should be sprayed after the leaves are slightly dry after the rain. Pay attention to the fertilizer
Summer corn balanced fertilization technology upgrade measures
Summer maize has a short growth period, rapid growth and growth, and the peak of nutrient absorption is concentrated early. Therefore, according to the growth of summer maize and the special law of fertilizer absorption, the application of nitrogen fertilizer should be applied to the base fertilizer, and the seedling fertilizer and jointing fertilizer should be emphasized. The fertilizer should be attacked and the phosphorus and potassium fertilizer should be used as the base fertilizer. Summer corn can not be applied to the base fertilizer due to the rushing of the seed, and the base fertilizer can be applied to the former crop to utilize the aftereffect. The specific fertilization amount is as follows:
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