Autumn corn has a short growing period and is easily threatened by drought, high temperature, low temperature in the later period, diseases and insect pests. Small corn cobs may appear, and even severe bald tops may lack grains. Therefore, we must do a good job of "five bogey."
Avoid the drought from the first 10 days of tasselling to 20 days after tasseling, which is the critical period of corn water demand. The lack of water in the soil will postpone the spinning and lead to insemination. In the early stage of the drought, the leaves are wilted, the plant growth is weak, and the seedlings are short; Should be planted in paddy fields with irrigation conditions; after sowing, if the soil water holding capacity is lower than 60%, it is easy to burn the dead buds and need watering and heat preservation; after emergence, if the leaves curl up, they must be protected against drought and seedlings; the jointing period should be maintained at about 70% during the booting stage. Water holding capacity, such as dew-whitening, requires irrigation; when the tasseling period encounters 1000 droughts, the irrigation yield is more than 30% higher than that of non-irrigation; in order to prevent water shortage, artificial pollination can be used, that is, when the filaments are exposed, the sunny dew is 9-11. Artificial pollination is performed once every other day for 3-4 times.
Avoid sowing too late. If the corn is heading after September 20, it is susceptible to low temperature or cold dew. If the temperature is below 20°C, fertilization is blocked, and baldness is lacking, so it must be sown at the beginning of August.
Avoid sowing too late autumn corn high temperature, shorten the sun, so that early reproductive growth of corn, vegetative growth period shortened. Therefore, the density should be increased, and the plant should be planted in wide and narrow rows with a width of 46 cm, a narrow row of 33 cm and a spacing of 22 cm and 5500 plants per mu.
Avoid fertilization too late autumn corn is generally less than one month after the start of the jointing season, the need for fertilizer early, so the fertilizer can be used twice in the jointing period and the big bell-mouth period; when the fertilizer is low, it can concentrate on top-dressing the joint fertilizer, promoting The young panicle develops well; on the basis of applying the base fertilizer, 4-5 leaves chase the joint fertilizer by water, apply 5 kg of urea per mu, 5 kg of potash, 8-9 leaves of panicle fertilizer, and 45% of compound fertilizer by mu. Kilograms, combined with irrigation ditch application or acupoint application; for the supply of concentrated nutrients, remove one-third of the total male flowers in the field at the beginning of tasseling.
Insect pests are most seriously harmed by corn borers and aphids. In the maize seedling stage and the big bell-mouth period, 3% carbofuran per acre can be used to control corn borer with 1.5 kilograms of dried fine loess cake. Controlling aphids can use 10% osmium net 2500-3000 times liquid + new high fat film. ; Paddy field corn should also pay attention to the control of sheath blight and other pests and diseases.
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