What should be prevented from planting summer corn?

What should be prevented from planting summer corn? Please introduce the following points to prevent the planting of summer corn: first, the high-yield characteristics of summer maize at ear stage are stout stalks, short internodes, broad and thick leaves, strong leaves and well-developed green roots. If the leaves turn yellow at the panicle stage, it is necessary to prevent late de-fertilization and premature senescence. In management, stalk-tapping fertilizer and grain fertilizer should be applied, urea 5kg per mu, hole application or ditch application, soil covering immediately after fertilization to prevent fertilizer volatilization loss, foliar spraying with 0.3%-0.5% potassium dihydrogen phosphate or 5% calcium superphosphate leachate during flowering filling period, 50-60 kg fertilizer solution per mu was sprayed evenly, and the yield was increased significantly. The heading and flowering stage of drought-resistant corn is the period with the most water demand in its life, requiring soil water holding capacity to reach about 70% to 80%, and field relative humidity to about 65% to 90%. If water is insufficient, high temperature and drought will affect the development and vitality of maize pollen and filaments, affect pollination and fertilization, and seriously reduce the seed setting rate and yield of maize. In the case of high temperature or extreme drought, the vitality of pollen is easy to lose; high temperature and drought is easy to dry up the filaments and lose their vitality. It is difficult for the pollen to germinate on the stigma, or because the filaments can not supply enough water after germination, the speed of the pollen tube reaching the ovary slows down, only a small amount of fertilization occurs after pollination, and the seed setting rate is not high. Therefore, when corn blossoms, in case of drought, we should timely irrigation to resist drought, through irrigation, replenish water, and adjust the humidity in the field. Irrigation should be carried out in the evening, furrow irrigation should be used, and flood irrigation should be avoided. In the middle and later stages of the growth of summer corn, the main pests are corn borer, armyworm and so on. At the end of the heart and leaf stage, when the plant rate reaches 10%, 0.5% methamidophos granules 0.5 kg and fine soil 50 kg can be used to spread in the big trumpet mouth; in the ear stage, when the plant rate reaches 20% after corn flowering and silking, control with 90% trichlorfon 0.2 kg plus 100 kg water per mu. When there are 50 and 100 armyworm per 100 plants in the late growth stage of the corn field, 2.5% trichlorfon powder can be used, 2 to 2.5 kg per mu. Click to get more corn planting techniques click to get more food crop planting techniques