On the 11th in the morning, the corn varieties selected by the Agricultural Science Department of Siping City, Jilin Province. The variety has the characteristics of high quality, high yield, stable production, disease resistance, etc., and the ripening period is earlier, and it is suitable for planting in mountain areas or early frost areas. 1 Selection and Site Preparation Corn is a fertilizer-fed crop, and it can be used to produce more potential in areas where soil fertility is higher. Therefore, we should choose medium-grown fertility, soil loose land cultivation, avoid heavy weight. Planted plots should be deep-sown in time after the harvest of the previous crop, with a depth of 30-35 cm. After the loosening, it is used to weigh, smash, and smash the mash. If conditions permit, it is possible to use the autumn ridge rake to reach the sowing state. 2 Reasonable fertilization Corn is a crop that requires more fertilizer, and the N, P, and K pure ratios are 1:1.5:0.3. Generally 90 hectares of urea is used as base fertilizer. During the jointing stage of corn or hectares of large flared halves, he applied 75 kg of urea, which has a significant effect on yield increase. It can reduce corn tip and ensure the balanced supply of nitrogen fertilizer in the middle and later stages of maize growth. 3 Seed treatment and sowing 3.1 Seed Selection Artificial seeds were cleaned before sowing to remove crushing particles, insect-eaten grains, and disease-plaque particles to ensure seed germination and purity. Corn seed coating agent can be seeded by 1.5% of seed amount before sowing. 3.2 timely sowing The best sowing date for the early morning of the 11th is May 3-13. If the seeds are planted too early, the seeds of the low temperature type will be easily produced and the emergence will be uneven. If the seeds are sown too late, it will affect the growth of corn and the dehydration in the later period. When planting, the sowing depth should be determined according to soil moisture conditions and temperature conditions in spring. The suitable sowing depth is 3-5 cm, the hectare sowing volume is about 25 kg, and the conservation of seedlings is 600-670 thousand hectares. 4 Field Management 4.1 Cultivating and weeding Mainly by chemical weeding, combined with machinery for cultivating grass. After sowing, 90% acetochlor 1500 mL+70% oxazinoxime 375 g per hectare was applied before the seedlings, and the herbicidal effect was better. 4.2 Seedling Management and Dressing For corn production to achieve high yields, the key is to keep seedlings. After the emergence of corn, timely inspection of the seedlings, in the 2 leaf 1 heart before and after the make-up seedlings, 3 leaf 1 heart to 5 leaf 1 heart during the seedlings, Dingmiao, and in accordance with the growing situation of the field in time for deep pine, cultivator soil management. In the small bell-mouthing period, combined with the second cultivator for extra-root fertilizer, topdressing 105 kg of urea per hectare. 5 timely harvest When the corn grains reach the ripening stage, the moisture can be harvested at around 25%. In the early years of the frost period, early precocious measures can be taken according to the weather forecast, such as sharpening of corn, drying of the fur, etc., which will benefit the dehydration of grains and improve the quality of corn. Http://
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