Fertilization of corn from jointing to booting is the period with the most need for fertilizer, especially the big bell-mouth period (leaf age index is about 60%) is the key period for determining the size of the ear and the number of grains. During this period, nitrogen fertilizer should be re-used, and 20-25 kg of urea can be applied per 1/15 hectares. Fertilizer should be deep-seated, with a depth of 10 cm and 12 to 15 cm from the plant. In the tasseling to the flowering period, it is necessary to supplement the grain fertilizer, and usually urea 7.5 to 12.5 kilograms per 1/15 hectares. The jointing stage of watering corn to the tasseling stage enters a vigorous growth stage, especially about 10 days before tasselling, and the water requirement is higher, and it is the critical period of water demand. At this point, the relative soil moisture content of 70% to 80% is appropriate. Maize tasseling until the flowering stage is very sensitive to the water response, is the peak period of water demand, the relative soil moisture content should reach 80%. The formation of kernels to wax ripening is an important stage in determining corn yields and still requires sufficient moisture. This period, the relative soil moisture content of 70% to 75% is appropriate. In each of the above periods, if the soil moisture content is below the lower limit of the appropriate moisture content, it should be watered. At the same time, it should be drained in time. In the middle and late stages of the control of pests and diseases in the growth of corn, when the average amount of sputum per 10 plants reaches 500 or more, 40% of omethoate EC may be sprayed and sprayed at 1000 to 1500 times. Corn borer is the main insect pest during the heading stage. 250 grams of 3% phoxim granules per 1/15 hectare can be mixed with 5-6 kg of fine sand, sprinkled on the corn leaf or leafhopper, tassel leaves and ear. The control of corn leaf spot size can be sprayed with 50% carbendazim or 50% tetrazine 500 times, spray once every five days, and spray 2 or 3 times. The removal of small strains before and after tasseling and before silking, and the removal of a small number of weak and weak strains without joints, can save water, fertilizer, and ventilation in the fields. Artificial emasculation When the maize tassels have just exposed the parietal lobe, and there is no loose powder, the tassels are removed from the row or septum so that the nutrients are concentrated to supply the ear. Artificially-assisted pollination To ensure complete pollination, in the later stages of tassel loosening, it is necessary to examine each plant one-by-one, and artificially assisted pollination should be performed on fresh filaments that are not pollinated. Appropriate late harvest should not be affected in the case of sowing of crops. In order to achieve the goal of late harvest and increase production, the management of fertilizer and water in the middle and later stages of corn should keep up to ensure the maturity of live and green maize leaves. Harvested when the corn glutinous leaves turned white, loose, the grain lines disappeared, and the contents hardened completely.
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