The main cause of spontaneous seedlings is seed germination and emergence from the fields that were left in the year or the following year. After rape matures in the field, some of the grains will fall into the soil due to natural defoliation and stacking, spraying, and drying in the fields. When the suitable conditions are met, they will gradually germinate and emerge in the autumn, the next year or longer. . At the same time, if self-produced rapeseed is not controlled, it will continue to bloom in the fields, and it will form a cycle. In addition, if the farmyard manure is not adequately cooked, especially if the manure is made from rapeseed husks, self-generated seedlings will also emerge from the germination and growth of the seeds remaining in the farmyard manure.

How to distinguish the seedlings from the time point of view, showed early emergence. Because it is drought-tolerant, resistant to waterlogging, and has a strong ability to resist adverse environmental conditions, the root system develops earlier than sowing rapeseed and absorbs fertilizer. The field-grown seedlings observed in the field are larger and stronger than the seedling rape seedlings. From the morphological point of view, it is very different from the seedling rape seedlings, autumn seedling rape seedlings grow neatly consistent, and the self-seeding seedlings are of different shapes and distribution. Planted rapeseed varieties are generally of the cabbage variety, while self-producing seedlings are mostly of different types of cabbage and mustard varieties. There is a clear difference in leaf shape and leaf color from cabbage oilseed rape. From the standpoint of growth, seedling seedlings are inconsistent in genetic isolation, drift, or germination, and the seedlings in the field are not neat. The emergence varies from morning to evening, and the lengths range from high to low, while the autumn seedlings grow neatly and consistently.

Prevention measures Because field seedlings are mostly descendants of offspring or isolated products, the erucic acid content in the variety traits rises significantly, and its yield potential cannot be compared with Daejeon's autumn rapeseed. If it is not cleared, the rapeseed will be affected. Yield and quality. Self-seeding seedlings compete with seeding seedlings to compete for fertilizer and compete for light, and form a strong competitive relationship with the normal rape seedlings in autumn, which is not conducive to the growth and development of rapeseed, so that it loses the favorable conditions for autumn and winter.

Take the following measures to prevent it. 1 Conditional rotation should be adopted as much as possible. It is best to use dry crop rotation to avoid continuous cropping with cruciferous crops. Through crop rotation, the viability of the rapeseed seeds in the soil is weakened, or other crops in the first season are changed in the winter, and the rape seedlings are eliminated with the herbicide during the management, so as to clear the hidden troubles for the next autumn rapeseed sowing. 2 Weeding and killing seedlings with pre-emergent herbicides before sowing. 3 Strengthen the seedling selection and cleaning of bed seedlings in transplanting rapeseed, and prevent the seedlings of the seedbed from being brought into the field. Before the seedlings are seeded, the live rapeseed must be carefully removed and removed from the seedlings to ensure the uniformity and purity of the rapeseed. 4 timely harvest. Try to harvest before rape matures. It's best to hold the cut rape out of the field and spread it to thresh, so that the grain will not fall out of the field. 5 Use adequately cooked farmyard fertilizers to prevent the introduction of fertile seed oil seeds through the fertilizer.

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