Field Management measures in the Middle and late stage of planting Summer Maize

1) timely ploughing and topdressing to meet the nutrient demand. During the period from jointing to small trumpet mouth (6 leaves to 10 leaves), fertilization was carried out in combination with mid-tillage. Through mid-ploughing, killing wheat stubble to loosen the soil and weed. Topdressing is mainly nitrogen fertilizer, not surface application, should be concentrated near the root hole application or strip application after deep covering soil, improve the utilization rate of chemical fertilizer and prevent seedling burning.

(2) timely drainage and irrigation to prevent waterlogging and drought. During the whole growth period of maize, drought and waterlogging should be tolerated at seedling stage, and waterlogging should be timely drained in case of rainstorm to prevent sprouting and seedling waterlogging. From booting to filling stage, there is a large demand for water, which is more resistant to waterlogging but can not be short of water. Irrigation should be carried out in time in case of drought. During this period, 1-2 times of irrigation can greatly increase the yield of maize.

3) strengthen field management to prevent lodging and production reduction. Lodging, especially in the middle and later stage, is the main factor that limits the yield of maize. On the basis of planting density-tolerant and lodging-resistant varieties, reasonable close planting, rational fertilization, ploughing and soil cultivation, and timely removal of small and weak empty plants, if it is found that the density is too high and there is a serious risk of lodging, plant growth regulators can be sprayed in advance. For example, 50% of Daizhuangsu water agent is sprayed before booting to prevent it.

4) do a good job in the prevention and control of diseases and insect pests and prevent the harm of diseases and insect pests. The main diseases in summer corn area are leaf spot, stem rot (bacterial wilt), dwarf mosaic disease, and the main pests are corn borer, armyworm, cotton bollworm, aphids, underground pests, thrips and so on. All localities strengthen prevention and control through forecasting and forecasting.

(v) timely harvest, quality and quantity. When the corn plant matures normally, the bract gradually dries up and loosens, the grain "milk line" disappears, and a black layer is formed at the base, showing the unique luster of the grain. The moisture content is generally about 30%. At present, the common problems are early harvest, high moisture content, low bulk density, many mildew grains, damaged grains and poor commodity quality, which affect both yield and quality. Wait until the corn is fully ripe, at least until the ear is completely bark. Proper late harvest is beneficial to the increase of maize yield and quality. At the same time, it is necessary to master the relationship between sowing land and planting wheat in time.