Cultivation techniques of Spring Maize

According to local conditions, Yedan 13, Xiyu 3, Huayu 4, Zhongdan 32, Chenghai 1 and Expedition 808 were selected to popularize in plain and hilly areas; Yedan 22, Yedan 51 and 9362 with short stalk and short growth period were selected for interplanting in cotton fields; waxy corn varieties such as Zhongnuo 1 could be planted in suburban areas, and Eyu 4, 78211, Yedan 19 and Eyu 6 were popularized in western Hubei. According to the results of scientific experiment of applying sufficient base fertilizer and skillfully applying topdressing, the yield of corn is more than 500kg per mu, which requires about 2500 kg of farm manure, 30 kg of ammonium bicarbonate, 40 kg of calcium superphosphate, 8 kg of potash fertilizer and 1 kg of zinc sulfate. Topdressing seedlings skillfully apply 5-6-leaf stage, early topdressing and attacking seedlings, applying urea 4-5 kg per mu, heavy application to small and weak seedlings to promote balanced growth. When the 10-11 leaves were unfolded, they were re-topped with ammonium bicarbonate 40 kg per mu, burrowed fertilizer, and 3-4 kg urea per mu in the heading stage. Standardized cultivation, reasonable planting corn planting system has net seed, intercropping and intercropping. The net corn box width is 120cm, two rows of corn are cultivated in the middle of the box, the row spacing is 40mm, the plant spacing is 25cm, 4400 plants per mu; interplanting with wheat and rape, 170cm wide, sowing (planting) two rows of corn in the middle of the reserved row, the row spacing is 40cm, the plant spacing is 20cm 23cm, 3500 plants per mu; intercropping with cotton, planting a row on the side of the box, planting about 1200 plants per mu. In plain and hilly areas, sowing and raising seedlings in mid-March and transplanting in early April; plastic film covering sowing in late March and mulching in mountainous areas in mid-April; in areas with high level of scientific planting, popularizing nutrient bowl to raise seedlings, transplanting in 3-leaf stage, and then covering with plastic film. Scientific management, the cultivation of strong seedlings is lack of seedlings to make up for planting, early breeding of prepared seedlings, found that lack of seedlings as soon as possible transplanting. The second is to control diseases and insect pests, using poison bait to control ground tigers and insect pests at seedling stage, such as trumpet stage, using furan mixed with fine soil to make poisonous soil granules into corn heart leaves, losing 3 grains per plant to control corn borer; in the later stage, Jinggangmycin was applied to control sheath blight and peel off the basal leaves. The third is to cultivate soil and support, jointing stage combined with topdressing soil 10 cm to promote aerial root growth. Fourth, clear ditches and drain stains, and corn in paddy fields should be well ditched and waterlogged to prevent waterlogging damage. Fifth, auxiliary pollination corn, cotton field intercropping corn, low planting density, low rate of mutual pollination between plants, artificial pollination should be carried out in the period of male silking to improve seed setting rate and obtain high yield and bumper harvest.