Management requirements of flowering and Grain stage of High-yield Maize against early senescence and lodging

The period from heading to maturity of corn is called flowering and grain stage. The central task of maize flowering and grain stage management is to create a good growth environment for pollination and fruiting, improve photosynthetic efficiency, prolong the physiological activity of roots and leaves, prevent premature senescence and prevent lodging. To achieve the goal of many grains, grain weight, grain fullness and high yield. There are mainly the following measures.

Maize flowering and grain stage

First, the amount of topdressing grain fertilizer is insufficient at the ear stage, and when there is a phenomenon of de-fertilization in the later stage, it is necessary to apply flower-grain fertilizer to promote corn grain satiety, grain weight and high yield. There are three principles to be grasped in topdressing. First, topdressing should be early; second, it should be appropriate, which should be decided according to the soil fertility and the growth of corn; and third, 0.4% potassium dihydrogen phosphate can be sprayed, spraying 80 100 kg per 667 square meters.

Second, drought prevention and waterlogging flowering stage is the peak period of water demand for maize, if water shortage in this period will affect grain formation and grain filling is not full, resulting in ear baldness, grain deficiency, grain blighted and thin, yield decreased. Therefore, it is necessary to irrigate in time in case of drought to meet the water demand of corn grain filling. However, in the later stage of maize growth, the root activity and waterlogging tolerance gradually decreased, and the waterlogging should be drained immediately in case of heavy rain or continuous rain. it is best to plough the low-lying fields after drainage, break the consolidation, loosen the soil, and promote ventilation. Prolong root activity.

Third, to prevent lodging maize from lodging has a great impact on yield, so measures should be taken to prevent it. The first is to make the seedlings sturdy and strong; the second is to cultivate soil to increase the number of supporting roots and improve lodging resistance; the third is to spray potassium dihydrogen phosphate on the basis of base fertilizer and potassium fertilizer to enhance the toughness of the plant. However, during the growth period of corn, it was hit by an irresistible storm, which caused lodging, and positive remedial measures should be taken. If lodging occurs after jointing, ploughing and soil cultivation should be carried out to restore the corn itself. When maize lodging occurs after heading, it should be picked up manually and cultivated in time to reduce the loss.

Fourth, the prevention and control of diseases and insect pests should be strengthened. When large and small spot disease occurs in corn, corn borer should be controlled in time.

5. Appropriate late harvest can postpone the harvest time, increase the grain weight and increase the yield without affecting multiple cropping. When the corn bracts are dry and loose and the grains become hard and bright golden yellow, it is the corn mature stage, and the harvest yield is the highest at this time.