Rape is a cross-pollination crop. The natural outcrossing rate of Brassica napus is more than 80%, while the natural outcrossing rate of Brassica napus is only about 10%, but its floral structure is still suitable for cross-pollination. Therefore, if rapeseed is not isolated, pollen is spread by insects and winds, and it is easy to pollinate with other rapeseed varieties. At the same time, rapeseed and cruciferous vegetables such as cabbage and radish are also easy to cross, resulting in biological miscellaneous, so that improved varieties The purity is reduced and the species is degraded. Here are three methods for farmers to keep their own seeds.
In the flowering stage of rapeseed, a good number of excellent plants with the characteristics of the variety, the same length, and robust and disease-free were selected and marked, and they were selected again before harvesting. Elimination of diseased strains and miscellaneous strains. The selected single strains were mixed and threshed and screened to remove small particles and pods and then left for seed use. In general, about 1 kg of seeds per 100 strains were selected.
Before harvesting rapeseed, select the robust, disease-free and consistent plants in the field with high purity before harvesting. Cut the main shaft to remove the tip. Take the best pods in the middle and mix and thresh seeds. Each spindle can have more than 30 to 40 middle pods, and about 500 to 600 spindles need to be cut out for every 1 kg.
In the rapeseed fields with high purity, strong growth, and consistent growth, or in several of them, the selection blocks are removed at the seedling stage, flood season, flowering stage, and maturity stage, and the diseased plants are removed, then single harvested and singles are harvested. Single possession.
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