Middle and late management points of corn

Timely fertilization of corn from jointing to booting is the period with the most need for fertilizer, especially the big bell-mouth period is the key period for determining the size of the ear and the number of grains. This period should be re-application of nitrogen fertilizer, urea can be applied 20 to 25 kg per mu; fertilizer to deepen the ditch, fertilization depth of 8 to 10 cm, 12 to 15 cm from the plant; in the tasselling to flowering to apply fertilizer, generally each Mushi urea 7.5 ~ 12.5 kg.

The water-cutting corns will enter the vigorous growth stage from the jointing stage to the tasselling stage, especially about 10 days before the tasselling. The water requirement is higher, and it is the critical period of water demand. At this time, the relative soil moisture content is suitable for 70% to 80%; corn water until the flowering period is the peak period of water demand, the relative soil moisture content should reach about 80%; grain formation to the wax mature phase requires sufficient water, this period The relative soil moisture content is preferably 70% to 75%. If the soil moisture content is below the lower limit, it should be watered.

Timely Control of Pests and Diseases In the middle and late stages of corn growth, when the average amount of pupa per 10 corns reaches 500 or more, 40% omethoate EC can be sprayed with 1000 to 1500 times of liquid to prevent and control; corn pods are the main pest during the ear, and 250 can be used per mu. Gram 3% phoxim granules, mixed with sand 5 to 6 kg, sprinkled on corn leaf or leafhopper, tassel leaves and ears; control corn leaf spot, 50% carbendazim or 50% retreat Special 500 times spray of bacteria, spray once every 5 days, even spray 2 or 3 times; corn leaf spot can be sprayed 50% of carbendazim WP 500 times in the end of the heart to the tasselling period or the initial stage of disease. Or 75% chlorothalonil WP 800 times, every 10 days to prevent one time, continuous control of 2 or 3 times.

Excluding weak and small strains before and after corn tassels and silking, a small number of weak and weak strains with no knotting ability were eliminated, which not only saved water and fertilizer, but also facilitated ventilation and light transmission in the fields.

Artificial emasculation When the tassels have bare the parietal lobe, and there is no loose powder, the tassels are removed from the septum or septum so that the nutrients are concentrated to supply the ears.

Artificial pollination pollen tassel loose powder in the late period, to be checked one by one, to the no-fat filaments, to artificially assist pollination.

Appropriately late harvesting should be carried out in a timely manner if it does not affect the sowing of late crops. The corn glutinous leaves turned white, loose, the grain lines disappeared, and the contents were completely hardened and harvested.

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