In the process of seed production, spring rape must strictly abide by the techniques and requirements for the breeding and protection of hybrids, and also must grasp the following technical points: To ensure the purity of the parent seed, which is the basis for guaranteeing the quality of seed production. The male and female planting densities were appropriately adjusted so that the maturation of the female parent was early and concentrated, and the male flowering period was extended as much as possible. The specific density depends on the line spacing and the proportion of the parents. The average male and female planting density is 1:2----1:3. In the seedling stage and early flowering stage, the work of removing impurities and impurities is completed, and the bad strains, abnormal strains and other rapeseed varieties in the female parent are eliminated, and in particular, the fertile strains in the clean female parent are eliminated to ensure the purity of the hybrid seed. Timely cut off the father. The mother's final flowering time cuts off all the fathers in time, so as not to mix the father with the mother. It can improve the maternal fertility conditions, which is conducive to the development of pods and seeds. Guarantee the purity of seed production and increase the seed production. Improve maternal fertility rate. If the parents do not meet during the flowering period, part of the female parent's flowers will not be able to reduce the maternal seed-setting rate because they cannot receive the pollen of the paternal parent, which will affect the seed production. The flowering period can be met by adjusting the cultivation techniques such as topping and partial fertilization. In addition, artificially assisted pollination or stocking of pollinating bees at the flowering stage can also increase the pollination rate and ensure the seed production. Timely harvest. When more than 75% of the pods in the field turn yellow-white, they are hand-harvested.
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