Summer corn late management technology released, the growth is not easy to remedy

  In the first half of this year, the precipitation in our province was less, and the sowing period of corn was slightly delayed compared with the normal year. In some areas, the sowing or emergence of seedlings due to drought affected the field uniformity. Since the end of July, the province's precipitation has been mostly high, especially in mid-August, which was affected by the strong typhoon “Litchma”. The average precipitation in the province exceeded 160 mm, and some farmland appeared to be infested, which seriously affected corn production. At present, the summer maize in our province has entered the flowering pollination period or the early stage of grain filling, which is the most critical period for determining the number of grains and grain weight. The central task of field management at this stage is to improve the quality of pollination, ensure the number of grains, ensure the photosynthetic area and time, prevent premature aging, increase the grain weight, and increase the yield to compensate for the disaster reduction. The main measures are: anti-falling, leaf-preserving, composting, increasing grain weight, preventing pests and diseases, and harvesting in a timely manner.

The first is to dredge the ditch and improve the ability to resist drought and flood. All localities should do well in disaster prevention and mitigation plans in advance, pay close attention to weather changes, fully prepare, take early measures to mobilize the masses, dredge the broken ditch, excavate drains, organize machinery and drainage equipment, etc. When the water is accumulated in the field as soon as possible. At the same time, prevent dry weather, water in the drought, and ensure normal water supply during the corn season.

The second is to apply grain fertilizer to ensure the supply of nutrients in the later period. At present, most of the corn in our province is in the early stage of grain filling, and some plots are in the stage of silking and silking. In this period, the demand for nutrients, especially nitrogen fertilizer, is relatively large. In the early period, the province generally had heavy rainfall, soil nutrient leaching, and easy to remove fertilizer. Nitrogen fertilizer should be added. Urea should be applied 10 to 15 kg per mu to improve the photosynthetic efficiency and extend the leaf functional period. Foliar application of potassium dihydrogen phosphate and urea can also be applied to increase the photosynthetic product conversion and increase the grain weight. High-yield research and development will increase the amount of nitrogen fertilizer as appropriate.

The third is to classify and improve the ventilation and light transmission conditions. This year's drought has caused a prolonged sowing date. The growth of corn in the field is quite different. Especially after the typhoon, some plots will fall, affecting ventilation and light transmission. Corresponding measures should be taken according to the situation. After completing the pollination of the corn on the ear, it is necessary to cut off the broken part in time; the plot with serious lodging, severe stems under the ear, and too late development can not form yield, and should be harvested early as silage.

The fourth is comprehensive prevention and control to reduce the damage caused by pests and diseases. After heavy rainfall, the corn field has high humidity and high temperature, which is prone to the occurrence and spread of pests and diseases. It is necessary to pay close attention to the development trend of pests and diseases, strengthen monitoring and early warning, and do a good job of unified prevention and control. The corn is still in the area where the silking and silking period is to be carried out. It is necessary to implement the “one prevention and double reduction”, mix the sterilization and insecticide, use large-scale application equipment and fly defense to carry out large-scale prevention and treatment, and apply a variety of diseases and insect pests at one time to reduce the pests and diseases. The number of ear worms in the late stage of maize is reduced, and the prevalence of disease is reduced.

The fifth is to tap the potential and harvest to increase the grain weight. At present, most varieties have a long growth period and cannot be fully matured at the time of harvest. Appropriate harvesting can prolong the grouting time, facilitate the accumulation of dry matter, give full play to the high yield potential of the variety, increase the grain weight, and increase the yield. Especially in the case of the early drought affecting the development of corn, it is necessary to continue to train and publicize the corn harvesting technology, increase the maturity of the corn as much as possible, and increase the grain weight to ensure the yield. It is recommended that general plots be harvested at the end of September and early October, and high-yield plots will be harvested around October 10.

Sixth is scientific guidance to improve the quality of straw utilization. It is necessary to actively promote and guide the comprehensive utilization of straw. Straw returning to the field, it is necessary to strengthen the training of the operator to ensure that the straw is chopped and shredded. When deep turning, urea and decomposing agent should be added to accelerate the decomposition of straw; in areas with conditions, corn yellow storage and biomass energy can be developed. Comprehensive use of the test.