What should I pay attention to when planting corn in summer?

What should we pay attention to when planting corn in summer? Please give an introduction to the following points: during the growing period of summer corn, due to insufficient supply of mineral nutrients and malnutrition, it can not meet the nutrient needs of ear differentiation; planting density is too large, poor ventilation and light transmission, and the effect is weakened; partial application of nitrogen fertilizer, lack of phosphorus, potassium fertilizer and other factors will cause empty stalk. Control methods: appropriate amount of topdressing and irrigation should be applied in the jointing stage and trumpet stage of maize to facilitate ear differentiation and development; nitrogen fertilizer should not be applied in topdressing, but nitrogen, phosphorus and potassium should be applied together to ensure nutrient balance and reduce the rate of empty culm. The main reasons for preventing baldness are lack of phosphorus in soil, sugar metabolism, protein synthesis and cell division of maize at booting and flowering stage, atrophy at the top of ear, slow elongation of filaments, and inhibition of pollination; lack of potassium in soil, transport of soluble carbohydrates to grains is blocked, lack of starch in grains; diseases and insect pests or drought affect the transport of nutrients, resulting in baldness or empty ears. Prevention and control methods: first, to prevent premature senescence of plants, apply more phosphorus and potassium fertilizer, and spray 0.4% potassium dihydrogen phosphate solution every 10 days in maize jointing period, spraying three times in a row to supplement phosphorus and potassium deficiency; second, timely irrigation, especially in the case of drought during the silking period, to replenish water in time; third, to prevent and control diseases and insect pests. Three reasons for preventing premature senility: first, there are too many Rain Water in the later stage, soil consolidation and hypoxia, root activity is blocked, absorption function is weakened, leaves yellowing or curling; second, lack of fertilizer, short plants, slow growth. Prevention and control methods: heavy topdressing in maize jointing stage and trumpet mouth stage, combined with foliar fertilizer spraying, supplement nutrition, prolong leaf functional period; balanced water supply, timely watering in case of drought, timely drainage and waterproofing in case of rainstorm or continuous rain. Ensure the normal growth and development of corn. Fourth, to prevent lodging, first, to do a good job of squatting seedlings to make seedlings sturdy and strong; second, to cultivate soil in the middle to increase the number of supporting roots and improve lodging resistance; third, to spray potassium dihydrogen phosphate on the basis of base fertilizer and potassium fertilizer to enhance the tenacity of plants. Positive remedial measures should be taken when lodging occurs during the growth of corn. If lodging occurs after jointing, ploughing and soil cultivation should be carried out, and there is no need to pick it up manually to allow the corn to recover itself. If lodging occurs after heading, it should be picked up manually and cultivated in time in order to reduce the loss. Corn is prone to large and small spot disease in the later stage, and carbendazim or 75% chlorothalonil can be used to control the disease at the initial stage. When corn borer occurs in the later stage, it is necessary to control it in time. Click to get more corn planting techniques click to get more food crop planting techniques