Field Management in the later stage of planting Maize

1 removal of weeds and weak plants in the field

With the popularization of mechanized harvesting of wheat, the shielding of wheat straw and stubble reduces the control effect of herbicides, and the weeds left over in wheat fields also increase the difficulty of weeding. The weeding effect of chemical weeding is not good, and it is necessary to pay close attention to ploughing and weeding in the fields where there are many weeds. Combined with weeding and removing diseased plants, small plants, weak plants, miscellaneous plants and tillers, it is necessary to remove plants properly if the density of remaining seedlings is too high, so as to maintain a reasonable and good population structure in the field. In the corn field, there are always a certain number of plants forming empty stalks or low plants with sterile ears, which not only consume nutrients in vain, but also affect the photosynthesis of other plants. For such a gaudy plant, it must be pulled out so as to concentrate the limited nutrients on the normal plant. Corn can grow several ears, but only one is ripe, and the maximum is 2. In order to promote early maturity and increase yield, each maize plant had better retain the uppermost ear and get rid of all the others, so as to ensure the fullness of the main ear and increase the yield.

2 cultivate soil in time to prevent lodging

Because it is windy in autumn in Anyang area, it often causes maize lodging. Therefore, it is necessary to cultivate the soil in time after topdressing corn to prevent lodging. If the lodging phenomenon occurs in the growing period of corn, it will seriously affect the formation of yield, which can lead to no harvest. Soil cultivation can increase the formation of aerial roots and enhance the lodging resistance of maize.

3 timely prevention and control of diseases and insect pests

In recent years, summer maize basically adopts no-tillage direct seeding, and the damage of diseases, insect pests and weeds tends to be aggravated. The prediction and control of diseases such as top rot, sheath blight, stem rot, and insect pests such as aphids, corn thrips, corn borer, etc., should be strengthened. In the middle stage of corn, we should focus on strengthening the control of corn borer, armyworm, cotton bollworm and large and small spot, especially on corn borer. In the later stage of corn, red spiders and aphids were mainly controlled, and comprehensive measures were taken, such as castration, shearing, field spraying and so on. The best time to control corn borer is in the trumpet stage. Use 1.5% sulfuric acid granule 1 ~ 1.5 kg per 667m2, put it in a large cola bottle, put 7 ~ 8 small holes in the bottle cap, and infuse it for prevention and treatment. The armyworm was sprayed with 40 ml water and 60-75 kg per 667m2 with 20% quick killing butyl EC. Aphids were sprayed with 40% omethoate EC 1 000 ~ 1 500 times. Corn leaf blight can be sprayed with 50% carbendazim wettable powder 500 times or 75% chlorothalonil wettable powder 800 times from the end of the heart leaf to the male stage or early stage of the disease, once every 10 days, and continuously controlled for 2 ~ 3 times.

4 appropriate late harvest

If the sowing of the following crops is not affected, it should be harvested late appropriately. Corn bracts are harvested when the bracts are white, loose, the grain lines disappear and the inclusions are completely hardened. The results showed that the 1000-grain weight increased by about 3 g per day when harvest was delayed by 1 day. This technology does not increase any investment, but the effect of increasing production is obvious.