First, to eliminate impurities, to strictly comply with the cabbage seeds used in production in recent years, the vast majority of which are hybrids. The cross-breeding parents are self-incompatible lines selected by scientific research departments. Each parent has a certain degree of Typical plant traits. The system must be based on the characteristics of their parents, strictly go to miscellaneous, detrimental, to diseased plants, rather than the suspicious plant Ningba not stay, which is an essential measure to ensure the purity of seeds.
Second, the isolation conditions must ensure that the natural hybrids of different varieties and varieties of Chinese cabbage are prone to biological hybridization. Therefore, the Chinese cabbage farming system must be combined with other Chinese cabbage varieties as well as Chinese cabbage, rapeseed, rapeseed, turnip, and mustard. Other farms are isolated and the distance is more than 1,000 meters. If there is a vegetable production field in the quarantine area, if there is a commodity crop (such as canola) that has been convulsed beforehand, the twitching plants should be removed promptly. When all the fields are in flowering, other cruciferous pollen that can be strung together with Chinese cabbage biparental strains is not allowed in the isolation area. This is the key to ensure the purity of Chinese cabbage seeds.
Third, the flowering period meets the seed production according to the characteristics of the parent, the use of staggered sowing date, separate management of the parents, control of good temperature, light, water and fertilizer and pruning and other methods to adjust the parents to meet the flowering period, the two parents relative to the pollen amount of the seed ratio is 1 : 1 or 1:2. If the flowering period does not meet well, or the pollen amount cannot satisfy each other, it will produce inferior seeds and affect purity. Therefore, when entering the initial flowering period, if a parent is found to flower, it is necessary to get rid of the early flowers, and to be a parent in the final flowering period. At the end of the flowering period, another parent must use bamboo rafts to remove all unopened flowering branches in the early morning to prevent single-parent insemination. This is an effective measure to increase the grain weight and ensure the hybridization rate.
Fourth, bee pollination should be fully cabbage is an insect flower crop, the main medium for pollination is the bee. When the natural bee source is insufficient, it is best to plant a box of bees in the flowering period of the 1-2 mu farming field to increase the chance of insect-medium hybridization. How much pollinating bees directly affect the seed hybridization rate and yield, but it should be noted that when spraying pesticides to control aphids to avoid bee poisoning death, aphids and other pests must be completely eradicated before flowering, if the aphids are harmful during flowering, 50% can be sprayed. Fog (anti-Wei Wei) WP 2000 times liquid lice, harmless to bees. Practice has proved that the higher the yield of Chinese cabbage seed, the higher the hybrid rate and the better the purity.
5. Mechanical hybrids should prevent the seeds of different varieties from being mechanically mixed in the process of harvesting, drying, threshing, bagging, screening, packaging, storage and transportation. There must be labels inside and outside the bulk seed pockets, indicating the species name, origin, and Date, person in charge, etc. to prevent mistakes.
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