To improve maize yield, in addition to selecting good varieties, timely sowing, and strengthening field management at the seedling stage, it is particularly necessary to strengthen field management in the middle and late stages of corn production to reduce empty stalks and baldness and achieve high yields. The specific measures are to control the following six levels: 1. Ear fertilization followed by corn ear fertilizer is 10 days before heading, close to the big bell-mouth fertilizer. In this period, corn has the fastest vegetative and reproductive growth rates. Young panicle differentiation is the key to determining the size of the ear and the number of grains. It is also the stage where the amount of fertilizer is the most needed in a lifetime of corn. The total amount of topdressing is 50% to 60%, so it is called the critical period of fertilizer requirement for corn. Especially for low- and medium-yield plots and later-stage de-fertilizer plots, it is necessary to storm the panicle fertilizer and increase the amount of topdressing fertilizer. Mushi ammonium bicarbonate is 25 kg to 30 kg. At the same time, according to the timely increase of appropriate amount of micro-fertilizer, general mu with 0.2% of zinc sulfate to spray the whole plant, spray every 5 days to 7 days, and even spray 2 times. After heading, 150 grams of potassium dihydrogen phosphate can be used per acre and the water can be transferred to 50 kg and evenly sprayed onto the green leaves of the upper and middle corn plants. Generally, it can be sprayed once or two times. Second, disease prevention and pest control off the plants suffering from smut, black powder has not been distributed before the removal, promptly removed, buried or burned, so as not to be infected with the disease the following year. At the same time, corn enters the end of the heart and leaves, that is, the big bell-mouth period, which is the best period for the prevention of corn borer, because at this time the corn borers are all concentrated in the leaves to harm, and provide conditions for the elimination of drugs. Control methods: 1 chrysanthemum pesticides 1000 times, remove the sprayer sprayer, spray the liquid into the heart of the foliage. 2 Sprinkle with 50% phoxim emulsion 500 times in the leaf plexus. 3 Mix carbofuran into the fine soil and make it a poisonous soil. Spread the poisonous soil into the bell mouth of the heart and leaf plexus. 3. Interlaced male fertilization can reduce the weight of the upper part of the plant, increase the lodging resistance, and reduce nutrient consumption, and promote nutrient delivery to the ear. Method: Before the tassel is about 10 cm in size and the pollen has not been distributed, grasp the tassel with your hands and pull it upwards. Take care not to pull out or injure the leaves. The number of detaminated plants should not exceed 50% of the total number of plants in the field, and no more than 35% of the plants should have fewer plots. Fourth, auxiliary pollination Off the corn in the flowering period, we must seize the favorable opportunity to manually collect pollen, disseminated to the ear, we must edge mining, increased opportunities for fertilization. When pollination, if the filaments are too long to be conducive to fertilization, the filaments should be cut short, leaving about 1.5 centimeters in length and present in a pompon-like shape that does not cover each other to facilitate pollination. V. Drought resistance and drainage of corn in pollination grain filling period, long-term drought and long-term rain are unfavorable. In case of drought, we should adhere to early and late watering drought, cultivating loose soil, to ensure that there is sufficient moisture corn grouting; if it is rainy weather, we must clear the drainage ditch, remove waterlogging in time, in order to facilitate grain filling mature. VI. Supplementary measures: 1 In the middle and late stages of corn silking (female flowers), the stems between the first and second leaves in the upper part of the corn may be lightly folded to the extent that they are not broken. In this way, the pollination rate can be increased, and the folded stem segments can be restored to their original state after 3 days. 2 Clear trees: The undisturbed corn plants should be removed promptly.
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