Fertilization 1. Spike fertilizer. Generally, nitrogen fertilizer is applied in the big bell mouth period, accounting for about 50% of the total amount of cropping, and 30-40 kg of standard nitrogen fertilizer per mu. 2. Granular fertilizer. Generally, it accounts for about 10% of the total topdressing amount, and 10 kilograms of ammonium bicarbonate is applied per acre. When fertilizing, the groove is 10-15 cm wide at a distance of 10 cm from the plant, and the ditch is 9-12 cm deep. After fertilization in the ditch, the cover is covered with water.
Prevention and control of pests and diseases at the ear and stage (2326, -3.00, -0.13%) can be used in the large bell mouth period, using 1.5% of 3% phoxim granules per acre plus 5-6 kg of fine sand, or 50 The % phoxim emulsifiable concentrate is formulated into a 0.1% dose of toxic soil and mixed well in the corn heart. Control corn leaf spot disease, spray with 50% carbendazim 500-800 times solution; control corn rust and brown spot disease, spray 75-100 ml of water with 20% triadimefon emulsifiable concentrate per acre at the beginning of the disease.
Going to the male corn to help the male to help increase production. De-male can reduce nutrient consumption, promote the development of the ear; reduce the plant height, improve the ventilation and light-transmission conditions, enhance the anti-reverse ability; overcome the flowering and dislocation phenomenon of the male and female ears, facilitate the flowering period to meet, improve the seed setting rate; It is necessary to master the time, to go to the early operation difficulties, and the tassels are too tender, easy to pull off or bring out the heart leaves; too late, the nutrient consumption is too much, and the increase in production is not significant. The time for emasculation is about one-third to one-half of the tassel's heart. At this time, the hand is pinched and pulled out with a little force. It is better to operate from 9 am to 4 pm on a sunny day so that the wound is easy to heal. The number of male plants usually accounts for about one-third of the total number of whole plants, and no more than half of them, usually interlaced or detached. The two lines on the ground and the two on the ground should not go to the male, so as not to affect the pollination. The effect of assisted pollination is better when combined with emasculation.
Appropriate harvesting farmers are accustomed to harvest when the corn leaf is yellow and the top of the grain is hard. According to many years of practice, the harvest is early, and the thousand-grain weight is low, which affects the output. The sign of maturity of corn should be the disappearance of the grain milk line. At this time, the harvest is 1000-grain weight, which can increase the yield by 8%-10% compared with the traditional harvest. On the same ear, the upper grain milk line first formed and disappeared early; the grain milk line at the base of the ear formed late and disappeared late. When determining the suitable harvest period, the grain milk line at the lower part of the ear should be taken as the standard.
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