When the cotton grows out of three true leaves, it will be seeded. Early seedlings and Dingmiao seedlings not only prevent the formation of tall seedlings due to crowding between plants, but also reduce nutrient consumption. It is a cultivation and management measure advocated in production. However, due to the premature arrival of seedlings, the emergence of dead seedlings due to pests and diseases and adverse weather conditions, resulting in lack of seedlings broken ridge, not worth the candle. Because the cotton 3-leaf stage is the most vulnerable period of life in cotton, the secondary roots of cotton have grown, but it is still underdeveloped, and the nutrient supply capacity of the two cotyledons of the main source of cotton seedling nutrition disappeared. It is also in late May. It is a period of high incidence of cotton seedling disease, especially early-onset wilt, and the occurrence of ground tigers, cotton aphids, and blind apes. Therefore, for the seriously ill and disease-resistant varieties, as well as the heavier viscous and heavy soils in the ground tigers, the pests should be properly controlled at the same time as the pest control, so as to solve the problem of lack of seedlings and ridges.
Another issue involving cotton seedlings is how to achieve proper close planting. This is an important measure to increase cotton production and increase efficiency. The density of cotton should be determined according to different regions, different fertility levels, different planting patterns, different varieties and planting habits (experiences). If you determine the number of young plants left in your year, and if you meet the rainy year in your management level, the dense and dry years will not be too thin, and you will reach the standard of reasonable close planting. This is based on experience and predictions of the weather.
For the cotton area, there is no fixed number of remaining seedlings, only suitable range, such as the cotton in the middle and lower reaches of the Yangtze River generally 1300-800 strains per acre, the cotton area in the Yellow River Basin in the case of conventional pruning, generally 3000-1000 per mu. 4000 strains. How many acres of seedlings will be determined depends on the conditions of land and the level of management. High fertility, large plant type, simplified pruning, intercropping and interplanting should be properly kept seedlings; poor soil fertility, compact early maturing varieties (preferably 5000-6000 strains per mu in summer cotton), traditional fine pruning methods, and cotton planting Experience can be adequately maintained. In addition, the experienced cotton farmers can determine the number of retained seedlings based on the post-cotton plant height. Under conventional pruning, the general plant height is 100-120 cm, and the seedlings are 3000-3500 plants per acre; plant height is 80-100 cm, per acre. Seedlings 3500-4000 strains; plant height 70-80 cm, 4000-5000 strains per mu; plant height below 70 cm, about 6000 strains per mu.
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