Detailed Explanation of Key Technical Points for Spring Sowing of Cotton

Determine the density according to variety, soil fertility and planting method, and plant at a reasonable density to achieve full emergence from a single sowing. Generally, for single-cropping spring cotton varieties, the density should be kept at about 3,500 plants per mu, with a row spacing of 1 m and a plant spacing of 19 cm; for semi-spring varieties, the density should generally be kept at about 4,500 plants per mu, with row spacing and plant spacing of 15 cm; for summer cotton varieties, on plots with good fertilizer and water conditions, the density should be kept at about 6,500 plants per mu; on plots with average soil fertility, it should be kept at about 7,500 plants per mu; and on dry, barren, low-yield plots, it should be kept at about 8,000-10,000 plants per mu.

Full emergence from a single sowing is the foundation for increased yield and a good harvest. In production, to achieve full emergence from a single sowing, the first step is to select seeds of relatively high quality. Second, before sowing, necessary seed treatment must be carried out, such as seed selection and sunning the seeds, to improve the germination rate and germination vigor. To prevent seedling-stage diseases in cotton, seed dressing with chemicals should also be carried out. Third, attention should be paid to sowing quality, sowing with sufficient soil moisture and at the proper rate. Generally, the sowing depth should be kept at about 4 cm. In addition, for spring cotton, attention should be paid to applying sufficient base fertilizer, generally applying more than 5 cubic meters of organic fertilizer per mu and about 20 kg of ammonium dihydrogen phosphate.