The field management of corn in the middle and late periods mainly refers to the field management of the ear and flowering stages. Among them, jointing to booting is the heading stage; flowering pollination and maturing stage are flowering stages. 1, spike management (1) Timely cultivating, rushing, and fighting. Before corn booting has a strong ability to fight drought, mainly to seedlings. Should be combined with mechanical or artificial cultivating loose soil grass, timely removal of corn root rake, to avoid the loss of nutrients for no reason. When cultivating, avoid injury, seedlings and shovelling. (2) Dressing. When the maize plant height is about 60 centimeters, combined with the last mechanical cultivator, mu recovery urea 20-25 kilograms 5 centimeters in the root, 8 centimeters deep, about 15 days irrigation head water. (3) Corn borer control. In the autumn and winter irrigation, rotating crops, blue and yellow storage, in the middle of April that year, intensified rolling incineration of corn straw, but also the use of biological, chemical and physical control methods for the prevention and control of corn borer. Such as using BT, Beauveria bassiana and other pesticides to close the corn stalk pile on the yard; at the end of the trumpet season with BT, Beauveria bassiana and other biological agents 200 grams or with high efficiency and low toxicity pesticides filling the heart 1-2 times; in the winter In order to prevent or reduce the damage of corn borer, the generation of corn borer adults and the first generation of corn borer adults were hunted and killed by frequency-vibration lamp. (4) Chemical control. 5 to 7 days before the corn tasseling (that is, when the upper 7 to 8 leaves are not fully expanded), 30 grams of muskrobin (one) and 16 kg of water are uniformly sprayed on the leaves, and the strong stalks can be better prevented from lodging. (5) Before the implementation of the first water to remove the film, reduce the residual film contamination of the soil. When the noon leaves are temporarily wilting, sooner or later they return to normal and last for 2 to 3 days when the seedlings end. At this time, it is necessary to implement the unmasking of the headwater beforehand because of local conditions. This will not only improve the quality of irrigation, promote the rooting of corn roots, increase the lodging resistance, but also effectively improve the recovery of residual film in the corn field and reduce soil pollution. During the big corn flare season, the plastic film has basically no effect. For areas that are not susceptible to drought, low-lying lands, dams, loams and clay loams where watering is convenient, water is abundant, all the water should be removed before the water is released. After removing the film, ensure that the water is poured in time in 1 to 2 days so as to avoid drought; in particular, the village team that uses mechanical harvesting of corn in the autumn should strengthen the efforts to remove the film before the water. (6) Irrigation. After the film is removed, it should be filled with water in a timely manner. This time the water must be thoroughly filled with water. 10-15 days in time to keep up with the second water, heading and flowering in time to pour the third water. 2, flowering period management (1) timely irrigation. Corn can't lack water from flowering to maturity. To timely irrigation, ensure adequate grouting. This period should generally be watered twice, the last time to control the amount of water in order to prevent late-grooming. Generally, irrigation should be stopped when the grains harden. (2) Secondary dressing. In the pollination period of corn, if the lower leaves are yellow, there is a lack of fertilizer, should be combined with watering reference soil testing formula fertilization recommended card timely amount of topdressing urea, usually 10-15 kg per acre dosage to prevent premature aging. (3) Corn leafhopper control. Recently, high temperature and drought are very favorable to the occurrence or explosion of corn leafhoppers (red spiders). Many blocks in our county have sporadically occurred. On the basis of forecasting and timely prevention, early eradication of the weeds in the Tanabe field must be timely; the use of obligate acaricides such as Corbetter, Erfuroxin 2000x or lime sulfur and other agents, for corn Weed crops were closed around the fields to timely cut off the sources of corn leafhoppers. When early corn leafhoppers occurred, they should be controlled before fertilization and watering. In the middle and later stages, once the occurrence of corn leafhopper damage, the old victims of the lower part of the damage can be destroyed, buried out of the ground and buried, and then watering, keeping the field moist, can reduce its harm. 3, harvest When the ear of corn is dry, the loquat leaf is dry and loose, the grains are hard and bright, and the black layer appears at the position of the joint. It is a sign that the corn is ripe and should be timely harvested mechanically or manually.
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The key points of field management techniques in middle and late corn