Autumn corn cultivation techniques

Autumn corn refers to the addition of one-season corn on the basis of the three crops of "Wheat - Spring Maize - Red Root" in the early rice field or dry land. This will make full use of the autumn temperature and light resources and increase the multiple cropping index. Its technical points: 1 Use early-maturing varieties. During the growing season of autumn corn, the weather conditions are special: high temperature in the early stage and low temperature and rain in the late stage. Therefore, high-temperature early-maturing varieties with fast grain filling and fast maturation and good resistance should be selected. The varieties of autumn corn planted in our province include Shidan No.3 and Huangqi Shanjiao. 2 Select lands that are convenient for irrigation and irrigation and have high fertility. Many early autumn corn drought, more late autumn rain, but also early corn or spring corn corn planting, it must be selected for irrigation and irrigation is convenient, fertile soil, deep soil, water and fertilizer cultivation of land cultivation. Such as rice trench groove, one, two platforms and so on. 3 timely nursery transplanting and suitable planting density. The autumn corn must ensure that it does not affect its predecessor, and at the same time, its loose powder period must catch up before the advent of autumn rain. Early rice and spring corn in our province are usually harvested in the middle and early July. The sowing date of autumn corn is arranged 10 to 12 days before harvest, using fattening seedlings and transplanting 2 to 3 leaves. Mainly organic fertilizer. In general, 3000-4000 plants per 667m2 are planted in double lines and leave two plants. The spacing is 80-90 cm and the spacing is 40-50 cm. Each pair of nests is separated, and the nests are planted in the wrong nests to reduce the shade. 4 Strengthen field management 4.1 Scientific fertilization. Autumn corn has high temperature and rapid growth, so it should be "heavy bottom early recovery." Per 667m2 (the same below) with 30 kg of phosphate fertilizer and 1,500 kg of manure water as the base fertilizer; 4 leaves (turning green) 3.5 to 4.0 kg of pure nitrogen, about 1500 kg of manure removal water, Drought irrigation drought 6-7 leaf stage application of pure nitrogen 4.0 ~ 4.5 kg, about 1500 kg of manure scum removal stalks, combined with cultivator weeding; during the big bell mouth period pure nitrogen 6.0 ~ 6.5 kg, while earth up. 4.2 timely pest control. Autumn corn is in a hot and humid season with serious pests. It is sprayed with 800-1000 times of insecticides such as enemy killing and chrysanthemum emulsifiable concentrate in the 4-leaf stage, 6-leaf stage, and big bellmouth stage to prevent and treat corn borers and aphids. Other pests. 4.3 Artificially assisted pollination. During the powdery season of autumn corn, the temperature is unstable, and the males and females often do not coordinate with each other. In addition, the autumn rain is more, natural pollination is not ideal, and artificial pollination should be strengthened. Reduce baldness and seize high yields. After most of the plants spit out, mixed pollen was collected for artificial pollination twice. Improve the seed-setting rate. At the same time, the loosened male flowers are occasionally removed to enhance light and permeability and reduce pests and diseases.

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