At present, summer corn has entered the grain-filling period, and this period mainly aims at ensuring good grain-filling of corn grains, and provides basic guarantee for high yield and bumper harvest. But at the same time, pay attention to field management to prevent yield reduction, as well as late maturity of corn, which hinders harvest. Do the following three points to increase the productivity of corn by a hundred catties per mu!
1. Timely harvest. Without affecting multiple cropping, the harvest period can be appropriately postponed to increase the corn kernel weight and increase the yield. When the corn bracts are dry and loose, the grains become hard and shiny and golden, and the milk lines of the corn grains disappear completely, the corn is mature and the harvest yield is highest. How to control the harvest period? To put it simply, the late corn yield increase technology is to extend the corn filling time and increase the grain weight as much as possible without affecting the timely sowing of wheat, thereby increasing corn yield and improving corn quality. Some experts say that the late harvest of corn can increase the yield by more than 100 catties per mu!
2. Water and fertilizer management. After the corn is headed, the effect of the base fertilizer applied in most plots has been basically exhausted. In order to ensure grain filling and full grain, it is necessary to supply quick-acting nitrogen fertilizer to prevent premature aging of corn and increase thousand-grain weight. This is based on the actual local conditions and the use of fertilizer during the growth period. Each mu can be topdressed with 50 kg of ammonium bicarbonate or 16-20 kg of urea. At the same time, watering and topdressing to increase yield during corn filling is the key to ensuring a bumper harvest, but you must not invest too much, otherwise it will easily lead to corn greed and late maturity and affect yield.
3. Strengthen field management. Lodging in the middle and late stages of corn is the main factor limiting the increase in corn production. In the later stage of grouting, shallow field tillage is required once to loosen the soil for aeration, weeding and moisture conservation, to prevent weed damage. It is also conducive to nutrient decomposition, promotes root absorption, prevents premature aging of leaves, and increases yield. In addition, cultivating soil is also conducive to corn lodging resistance. The soil height should be 7-8 cm to promote rooting development, increase the number of supporting root layers, prevent lodging, facilitate irrigation and drainage, and increase yield. At the same time, timely control of pests and diseases. The main diseases and insect pests in the corn filling stage include small spot disease, Curvularia leaf spot, brown spot, rust, third generation corn borer, aphids, armyworm, etc. Curvularia leaf spot can be controlled by spraying zuconazole or tebuconazole; brown spot and rust can be controlled by spraying 25% triadimefon wettable powder; third-generation corn borer can be controlled by 5% emamectin·benzoic acid For salt, use 6 grams per mu to target the ears and back of leaves; spray 70% imidacloprid per mu for aphids, and spray 10-20 grams per mu for the aphids; use pyrethroid and carbamate insecticides for prevention and control of armyworms.
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