Winter Drought How to Manage Rape Fields
Since the beginning of autumn this year, my county has had a certain impact on the growth of large areas of rape because of less rainfall, higher winter temperatures, and lower soil moisture. The survey shows that wintering seedlings on different plots differ greatly. A few sowing, transplanting early, water and fertilizer conditions are good land, rape growth is prosperous, but most of the rapeseed seedlings are small, weak seedlings, growth is obviously insufficient, leaf area coefficient is low, sealing line is late, and some even The phenomenon of “poorly bolting†appears, which is detrimental to the high yields in the coming year. In light of the current situation of rape seedlings, we should focus on the following management work:
1, drought relief. For paddy fields with irrigated conditions and obvious unsatisfied soil, water should be used for irrigation in sunny afternoons when the water temperature is relatively high; for dry lands closer to the water source, winter fertilizer can be used in combination with drought resistance to supplement drought; near home, can be picked Diluted manure water resists drought. Through the use of water-based fertilizers, it will promote the early recovery of oilseed rape.
2, robbing fertilizer. After a continuous drought, fertilizers are less effective and more depleted. In the event of a rainy weather, fertilizers should be grabbed. In particular, poor soil fertility, no application of base fertilizer or severe shortage of base fertilizer, and weak seedling growth, we must pay attention to re-apply wax fertilizer, grab the topdressing available nitrogen fertilizer, and promote seedlings to expand growth, accumulation of nutrients, multiple branches, increase production .
3, to prevent freezing injury. The more winter-warm and dry years, the more susceptible the rape is to frost damage, the more attention should be paid to warming and freezing. The main measures are: first, after topdressing topdressing, loosen roots to prevent the roots and stems of rapes from freezing; second, rapeseed growing too vigorously, with 25% paclobutrazol 50g watering 30 kg uniform spray, promote seedlings by Mong Turn strong, enhance the ability to resist cold; Third, before the advent of low temperatures, the surface of the leaves will be sprinkled with a layer of grass ash, can be appropriately mitigated freezing injury.
4, remove grass damage. Dry winter rapeseed closures are postponed and grass shortages are prone to occur in the spring. Can be combined with cultivator manual weeding, or herbicides for chemical weeding. In the climate drought, soil weeding under severe environmental conditions, we must pay attention to adequate watering, the amount of liquid per acre of not less than 45 kilograms, spray as evenly as possible to ensure the weeding effect.
5, pay attention to pest control. In the winter dry years, the occurrence of locusts is generally heavy. In particular, the plots with early sowing and transplanting, fertilizer and water sufficient growth, and locusts are more serious, affecting not only the growth of rapeseed but also the transmission of diseases. Attention should be paid to timely spraying and prevention. At present, the insecticides with better effect on controlling locusts are Lebenben, Dagongchen, Yijingjing, Imidacloprid, Pibiwu, and Quxuanjing. Pay attention to water when spraying, spray should be careful and thoughtful. As the locust colonies often feed on the back of rape seedlings, the back is the focus of spraying. Generally according to the occurrence of aphids, continuous spraying 2 - 3 times, each time interval 7 - 10 days.
6, removal of early moss: winter dry year temperature is high, plants are prone to early moss early flowers. After bolting oilseed rape, the ability to resist coldness decreased significantly, and it was more susceptible to freezing injury in the event of low temperatures. Therefore, for rapeseed that has been bolted prematurely, it is better to remove the early moss and chase the fertilizing material on a sunny day to enhance the ability to resist cold, and at the same time promote branching and increase yield. In addition, the growth of thin rape can increase the available nitrogen fertilizer, to prevent the early moss has a certain effect.
6, make-up boron fertilizer: Boron year drought easily fixed by the soil, resulting in rape is difficult to absorb, and then induce boron deficiency, resulting in flowers but not real. Therefore, it should be combined with disease prevention in the early flowering period of rapeseed, and the quick-effect boron fertilizer, such as “Sonic Boron†sprayed on the foliage.
7, clean up the ditch: long drought will have long rain. Rapeseed is most afraid of waterlogging in spring, so it is actively fighting drought and preventing drought in the spring, as well as paddy field and flatland rape with high groundwater level, easy waterlogging, and cultivator clearance in combination with cultivator to ensure smooth drainage and convenient drainage. To prevent excessive water damage from spring rain.
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