How should the ear period of summer corn be managed?

How should the ear period of summer corn be managed? Please introduce the method of summer corn ear stage can refer to the following methods of management: 1, pull out weak plants, ploughing to promote root. For those small, weak and ineffective plants, they should be removed as soon as possible. The ear stage is generally ploughed for 1 to 2 times. After the small trumpet mouth period, the middle ploughing should be shallow, in order to protect the root and store soil moisture; 2, re-apply ear fertilizer. The time of topdressing is usually in the period of big trumpet mouth. The method of fertilization is as follows: combined with ploughing and soil cultivation, between the two plants 15-20 cm away from the corn row, make a deep hole with a depth of 6-10 cm and a diameter of 3-4 cm, apply 40 kg / mu of nitrogen fertilizer, apply fertilizer into the hole, and then cultivate the soil; 3, watering and drainage irrigation. The corn should be irrigated twice at the ear stage: the first time before and after the big trumpet mouth, it should be irrigated with topdressing. Before and after the second time, the amount of irrigation should be large. If there is too much rainfall and excessive soil moisture, it should be drained in time to prevent waterlogging; 4, timely prevention and control of diseases, pests and weeds. The main diseases of summer maize at ear stage are leaf spot, leaf spot, rust and so on. For the prevention and treatment of large leaf spot and small leaf spot, fungicides such as 10% Shigao, 50% hydantoin or 70 mancozeb can be sprayed at the initial stage of the disease, with an interval of 7 days, 2-3 times in a row. The prevention and control of brown spot and rust can be controlled with 1000-1500 times of 25% fenrust wettable powder or 50% carbendazim at an interval of 5-7 days for 2-3 times. In the spore peak period, spray with 250-300 times of 97% rust sodium solution or 800 times of 50% bacillus special wettable powder, once every 7 days, even for 2-3 times. Spraying 10% Shuangxiaoling 200 times liquid before and after jointing stage can effectively control corn stem rot. Summer corn pests are mainly corn borer, aphids and red spiders. To control corn borer, 1.5% phoxim granule 0.5 kg / mu mixed with fine sand 7 kg / mu can be used in small trumpet mouth and large trumpet mouth respectively, and the plant dosage is 1.5-2 grams. It can also be perfused with 90% crystal trichlorfon 1500-2000 times, or 75% phoxim EC 3000-4000 times, or at the top of the ear, 10 ml per plant. To control aphids, spray can be used such as 1500 times of omethoate EC, 1000 times of imidacloprid wettable powder, 2000 times of aldicarb, or 1500 times of cypermethrin EC. To control red spiders, avermectin (2000-3000 times), 2000-3000 times, or 1500 times of Miyangmycin can be used to control red spiders. 20% paraquat water agent can be used to control weeds in the middle and later stages of corn growth. Click to get more corn planting techniques click to get more food crop planting techniques