1. Seedling management: (before emergence - before jointing) 4-5 fully expanded leaves or 7-8 visible leaves. The leaves are dark green and the leaves are thick and thick. These should be: (1) Seedlings: keep the soil wet and dry, soil moisture accounts for 60% of the field water holding capacity, and promote the development of roots to form enlarged roots and deep rooting. To achieve the purpose of seedlings to promote strong, in order to facilitate water absorption, drought, seedling protection and harvest in the middle and later stages. (2) Anti-drought and anti-staining: In case of drought, the soil drought should be protected against drought and seedlings. Waterlogging of corn seedlings, low-lying "bud buds" of the plot, to be drained to prevent flooding and protect seedlings.

2. Management of heading and elongation at jointing stage: It takes 30 days before jointing - tasselling, during this period, vegetative and reproductive growth flourishes. (1) The emergence of spring corn - after the jointing season often encounters spring drought, whether it is pouring water, depending on the amount of precipitation. In the critical period of corn water demand, the precipitation can not meet the needs, often the threat of neck drought, so spring irrigation, big horn period and before and after heading irrigation is an important measure to ensure high yield of spring corn. Intercropping corn at the end of June and early July has a large amount of water for the joint differentiation of males and females. It does not always happen during the rainy season. Even if the spring water is poured, the temperature is high because of high evaporation. The possibility of drought is also high. Irrigation is a necessary measure to obtain high yields.

(2) Irrigation and tapping of water: The first 10 days from tasselling to 20 days after tasseling are sensitive to moisture in the maize water requirement. In case of drought, it must be watered to prevent drought and drought, to ensure the development of the male and female ear and the need for water in the subsequent growth period, in order to strive for a large spike to obtain high yield. If there is heavy rain during the above period, after the rain, the water in the field will be ruled out in time.

3, flowering and fruiting period management: (maize blossoming from the tassel - mature) lasted 45-55 days. At this stage of flowering and pollinating grain filling, a vigorous reproductive growth period was established and it was decided to constitute the production elements: number of ears, number of grains per spike, and grain weight. (1) Foot-filling and flowering, flowering, pollination, raising the seed-setting rate, preventing premature aging of stems and leaves, and competing for multiple grain weights. (2) Pouring good grouting and attacking seed water: During the grain filling stage, the leaves of plants grow yellow from bottom to top. Plants with premature senescence should be fertilized and watered to increase grain weight. (3) Excrement: Due to heavy rain, field water should be promptly removed. (4) Proper close planting can make full use of light energy, soil strength and space, so that the plants have good ventilation and light transmission, thereby reducing the empty rod. (5) The scientific management of fertilizer and water should be carried out according to the characteristics of each growth period. Special attention should be paid to the water and fertilizer management of the tapping, so that sufficient water and nutrients can be obtained during the growth and development of the corn. (6) Make artificially assisted pollination to ensure that bald pollination completely reduces baldness and lack of grain.

4, to prevent air bald and lack of grain. There are many reasons for empty baldness. Such as planting density is too large, lack of light, nutrients are in short supply, and water is insufficient. Http://

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