The main types of cotton production include three nursery systems, two nursery systems, and self-intermingled and mixed methods. Among them, the technical points of the three nursery system are as follows: 1. Single plant selection should be carried out in the plant nursery or original plant nursery, and the first production of the original plant can be carried out in seed field or in Daejeon. According to the characteristics of the original species, select the typical and consistent individual plant. The field selection of individual plants was divided into primary and final selections twice. In the first round of jingling, select and mark according to plant type, bell type, and leaf type; select the fiber length before roughing, and check the length of fiber on the basis of primary selection. The decision was made on the basis of boll-opening. The single player was put on a card and the variety number was marked. After the harvest, the indoor test will be carried out, and the final selection will be made according to the test results. Usually, about one plant per mu will be selected for about 120 bells per plant. 2. The line garden nursery planted the seed of the single plant selected in the previous year in the row and garden plant. The seeds of each plant were planted in a row with a length of 10 meters, a row spacing of 60-70cm, a hole distance of 30-40cm, and 3-4 grains per hole. , keep a strain after the seedlings. While doing a good job of observing records in the field, conduct another election and eliminate those that do not meet the requirements. In order to enter the selected line, 20 cotton bolls must be collected as indoor test materials. According to the results of the test and the indoor test, the high yield and good quality line should be selected and the ginseng should be reserved. 3, strains and nurseries will be selected last year, the rows of seeds, respectively, into a community, each cell 2-4 lines, length 15-20 meters, line spacing, hole distance, hole sowing, Dingmiao ibid. Observe records during the production period, and those strains that do not meet the typical cultivar of the original cultivar and the rate of miscellaneous plants above 10% will be eliminated. For the selected strains, after the indoor test, the final selection is performed, and then the ginseng collection is mixed. 4. The original plant nursery planted the mixed seeds of the selected strains of the previous year in the original plant nursery. Attention should be paid to the observation of the seedling stage and flowering period, and it is found that the miscellaneous plants should be immediately removed, and then the normal flowers before the frost should be mixed, and the special machine should gin after the ginning. The seed is the zero-generation seed.
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