It depends on sowing method, germination rate, seedling density and soil moisture. Drilling requires 10 ~ 12 kg of hairy seeds per mu. Sowing or hole sowing, 3-5 hairy seeds per hole, 5-7 kg seeds per mu; Each hole is coated with 2 ~ 3 seeds, and each acre needs 3 ~ 4 kilograms of seeds. The sowing amount should not be too large, otherwise it will not only waste seeds, but also easily form tall and weak seedlings after emergence, causing serious diseases. At the same time, water and fertilizer management should be strengthened, and cotton Zhuangdiling should be sprayed once in the bud stage, young fruit stage and cotton peach expansion stage, so as to improve cotton peach expansion vitality, protect cotton peach, speed up cotton tree circulation and germination, and improve fiber quality.

The general sowing depth is 3 ~ 4 cm. After sowing, cover the soil in time and suppress it appropriately.

Dongping county is often dry in spring, and in cotton fields where soil moisture conditions are not available, the method of "water seed package" is generally used for drought-resistant sowing. The technical points are as follows: according to the requirements of row spacing, shallow ditch is opened with a depth of 2.5 ~ 3 cm; The water flow is steady, and the water quantity should be connected with the bottom moisture; After underwater infiltration, sow according to the requirements of plant spacing; Then cover the soil and ridge, wet soil at the bottom, dry soil at the top, and moderately suppress it. The ridge is 3 ~ 5cm high and10 ~13cm wide; When 70% of cottonseed takes root, break the ridge and cover the soil in time and scrape it flat at one time.

The slow temperature rise and unstable temperature in spring are important factors to limit the whole cotton seedling and promote the early development of strong seedlings. Plastic film mulching has the functions of heat preservation, temperature increase, moisture retention and moisture improvement, which can ensure the whole planting and early maturity of cotton seedlings. According to the procedures of sowing and covering, cotton covered with plastic film can be divided into sowing first and then covering and sowing first. Generally speaking, sow first and then cover. When mulching with plastic film, the plastic film should be in close contact with the ground, and the edge of the plastic film should be pressed vertically into the ditch as far as possible, and the buried depth should be not less than 5 cm. At the same time, after mulch, soil should be pressed on the mulch, and a pile of wet soil should be pressed every 3 ~ 5 meters to prevent strong wind from blowing the mulch or inciting the mulch to hurt cotton seedlings.