Since the summer maize planting this summer, there has been more precipitation, and there has been rainy weather. Because the summer maize seedling stage should not be dry, the long-term continuous rain and illuminating will cause the stem length, plant height and ear height to increase, and the risk of lodging will increase later, which will cause pests and diseases, and reduce the high yield of summer corn. Stable production. Therefore, it is necessary to take timely supplementary management measures to reduce the adverse effects of continuous rainy weather on summer maize.
Excluding stagnant water
If the precipitation intensity is large, a large amount of water will accumulate in the field, and the water should be removed in combination with the actual situation of the plot. At the same time, the lodging of the corn plant should be righted and fixed, and the sludge on the surface of the leaf should be washed away to facilitate photosynthesis and promote plant growth. .
Cultivating
Long-term flooding or excessive soil moisture, soil permeability is deteriorated, it will inhibit the growth and development of summer maize roots. It is necessary to timely cultivate the loose soil to enhance soil permeability, improve the soil environment for root growth, promote root growth and enhance absorption. . It is also an effective method to prevent root rot in summer maize seedling stage. Clay plots should pay more attention to ploughing and digging after continuous rainfall.
Control pests and diseases
Precipitation has a long duration, high humidity, and insufficient light, which may lead to sudden emergence of pests and diseases, especially before and after jointing, which are root rot, brown spot disease, larvae, hummer, cotton bollworm, and sunflower stalk. During the period of development, and because the summer corn field has not been closed, the weeds in the field are growing vigorously, so it is necessary to timely prevent and control the pests and diseases. The root rot can be controlled by the treatment of mancozeb and metalaxyl root spray; brown spot disease can be controlled by spray rusting and difenoxazole spray; the genus can be used to spread the organic phosphorus agent. Remove the spray control around the spray; the cotton bollworm and the thrips can be sprayed with phoxim, beta-cypermethrin and avermectin; the weed control can be used after the herbicide, but pay attention to when spraying the herbicide Can not be mixed with other pesticides to avoid phytotoxicity.
Supplement fertilizer
After the flooded summer corn is removed, it is necessary to promptly ditch the appropriate amount of quick-acting nitrogen fertilizer to supplement the lack of nutrients caused by rainwater leaching and ensure the nutrient demand of summer corn. Depending on the growth of summer maize and the pre-fertilization situation, 10 to 15 kg of urea can be applied per mu. When urea is applied, it can be combined with ploughing and ploughing, and the fertilizer is buried below the soil to reduce the nitrogen loss caused by high temperature. It can also be combined with the prevention and control of pests and diseases after the rain. 150-200 g of potassium dihydrogen phosphate is used in the mu, and 30 kg of water is sprayed on the leaves.
Chemical regulation
Continuous rain will cause the “slim seedlings†in the summer maize seedling stage, and the corn growth regulator should be used for the regulation of the “slim seedlingsâ€. In 7 to 10 pieces of leaves, use 30 ml of Jindele, 15 to 20 kg of water, or 10 ml of jade gold, spray 30 kg of water, which can effectively shorten the internode length, dwarf plant height and increase. Thick stalks for enhanced resistance to lodging. When spraying, it is necessary to know the appropriate concentration of the agent to be used, and spray it evenly on the upper blade so that it does not spray or leak.
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