Three-cotton cotton seed production technology

Single plant selection should be carried out in the plant nursery or the original plant nursery, and the initial production of the original plant can be performed in the seed field or in the field. 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 primaries at the Chengling period, select and mark according to plant type, bell type, and leaf type; select the fiber length after roughing the primaries, check the fiber length, moisture level, and observe the maturity sooner or later and the boll opening The situation is decided and the individual is selected to hang cards and the variety number is indicated. 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. The line planted the seeds of the single plant selected in the previous year and planted the seeds of each plant in a row. The seeds of each plant were planted in a row with a length of 10 meters and a row spacing of 60--70 centimeters. The distance between the points was 30--40 centimeters. - 4 capsules, one 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. The plant nursery will plant the seeds of the line that were selected last year and plant them into small plots. Each plot will have 2--4 lines and a line length of 15--20 meters. Row spacing, hole spacing, hole sowing and Dingmong will be the same as above. 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. The original species 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 at the seedling stage and the flowering period, and the mixed plants should be immediately removed, and then the normal flowers before the frost should be mixed, and the seeds after special ginning are planted. As a zero generation original species.