The whole growth and development process of maize is divided into seedling stage, jointing, booting stage and maturity stage. The management of jointing and booting stage has a great influence on the yield of corn. The central task of jointing and booting stage is to coordinate vegetative growth and reproductive growth, properly control the length of stems and leaves, promote plant leaves, large ears, and more grains, effectively improve corn. Production. Its technical measures are:
First, the corn enters the jointing and booting stage, that is, the large bell mouth period is sensitive to water, the plant needs a large amount of water, the water is poorly fertilized, the leaves are prematurely degraded, the photosynthesis and nutrient transport capacity are decreased, the abortive grains are increased, and the grain weight is decreased. When the relative water content of the soil is less than 70% , it is necessary to water it in time to avoid the drought and reduce production. In case of rainstorms, it is necessary to drain in time, especially during the grouting, it is necessary to pay attention to flood control and drainage.
The second is to use corn dwarf spray to prevent corn from growing and controlling plant height when the corn leaves grow to 9-12 leaves.
The third is to re-apply the panicle fertilizer, apply the panicle fertilizer from the jointing to the end of the booting stage, and the fertilization period is generally in the 10-12 leaf stage ( ie, the big trumpet period ) , which can ensure the growth of the plant, promote the development of the ear and the differentiation of the floret, and improve the fruiting. Number of grains. It should be based on nitrogen fertilizer, and 25-30 kg of urea should be applied per mu .
The fourth is to combine the cultivating and weeding and cultivating the soil. The hole between the two corns is about 10 cm deep, and the fertilizer is applied into the hole, and the soil is buried. It is necessary to timely cultivate the soil and thicken the soil layer at the root of the corn plant to form a high ridge of about 20 cm to prevent the wind and rain from causing the corn to fall.
The fifth is to remove weeds in time, remove tillers, and reduce nutrient consumption.
Sixth, it is necessary to control pests and diseases. In the corn big bell mouth period, the poisonous soil or granules mixed with soluble "Bataan powder" plus fine soil or cinder powder can be sprinkled into the corn heart. Prevention of large and small leaf blight available tuzet powders, wettable powders, water spray chlorothalonil 7 days, spray, continuous spray every 2-3 times.
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