During the growth and development of rapeseed, there are often abnormal phenomena such as early moss, early flowering, and secondary flowering, which affect the yield and quality of rapeseed, and necessary measures should be taken to prevent it.
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Control technology for abnormal flowering of rapeseed
1, early prevention and treatment of early flowering moss
The rapeseed blooms in winter, which reduces the cold resistance of the plants and is susceptible to freezing damage. It is necessary to take corresponding measures to control according to the specific situation. For the rapeseed which grows better, the rapeseed will be bolted before the year or before the cold, and the deep-cultivation is 7-10 cm, and some roots are cut to temporarily inhibit the growth. When the leaves of the plant are slightly yellow, the appropriate amount of quick-acting nitrogen fertilizer is applied. For rapeseed which grows poorly and will be bolted, a method of heavy topdressing can be adopted to prolong the vegetative growth period and delay the bolting. The rapeseed that had been bolted to the previous year should be removed in the morning on a sunny day to suppress the growth of the apex and promote the development of the lower part. At this time, for the rapeseed with early moss, it is necessary to do antifreeze and warm work.
2, the flower is not realistic,
The main reason why rapeseed is not flowering is the lack of nutrients in the flowering period. The effective measure to prevent rapeseed is to supplement the boron to ensure sufficient supply of boron nutrition during the flowering period. It is advisable to spray borax solution with a concentration of 0.02% once in the seedling stage, the bud stage and the initial stage. When preparing the borax solution, the borax should be dissolved with a small amount of warm water, then diluted with water and sprayed in time. The spray is applied evenly, and both sides of the blade are sprayed and wet. For rapeseed with severe boron deficiency and obvious deficiency in the field, it should be sprayed twice in the initial flowering period.
3, the prevention of secondary flowers
The secondary of rapeseed can not only be strong, but also consume a lot of nutrients in the body, and aggravate the disease leading to premature aging, resulting in reduced production. Prevention and control of the production of secondary flowers by vegetables, first of all, rational fertilization, to achieve sufficient fertilizer, early application of seedling fertilizer, stable application of fertilizer, not biased with nitrogen fertilizer, increased application of phosphorus and potassium fertilizer, enhance plant lodging resistance; late control of nitrogen fertilizer application, Prevent flowers from being unreal. Secondly, it is necessary to strengthen the field management. In the winter, we must do a good job of soil and roots to prevent freezing damage, and at the same time promote root growth and development, and prevent plant lodging. After the spring, we must do a good job of clearing the ditch. In short, we must ensure the normal development of the pods, reduce the shedding of the flowers, so as to avoid the surplus nutrients to breed secondary branches.
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