This year, due to the overcast and rainy weather in October and December, the temperature in the county was relatively low, and the waterlogging of rape was more obvious. The growth of rapeseed was not optimistic. Based on the current situation of the seedlings and winter spring trends, the following technical advice on field management of rapeseeds in winter and spring is proposed.
First, strengthen the forecasting report and eliminate it in time. Strengthen forecasting and timely prevention and control. When the strain rate of rapeseed field reaches 8%, the back of rape leaf can be sprayed with 10% imidacloprid wettable powder 40-60 g and 40-50 kg water per acre.
Second, Qinggou dregs, warming and keeping seedlings. This year, my county has more rain in autumn and winter, and rape roots are underdeveloped. The rainy weather often occurs in March and April of the calendar year, which will affect the development of the root system, especially the rice-rice rapeseed. The water in the field is serious and is prone to waterlogging. Therefore, during the overwintering period, clearing and digging should be promptly conducted to keep the “three channels†open, prevent stains from falling, and promote root growth. At the same time, Qinggou clay was cultivated in the root of rapeseed, inhibiting the growth of weeds and increasing the temperature and preventing freezing. Rape rape can be combined with weeds for cultivating soil in the cultivator to increase the temperature of soil in the root of rapeseed, control the growth of aboveground of rapeseed, promote the development of root system, enhance the cold resistance of plants, and reduce the threat of freezing damage. Ensure rapeseed seedlings are overwintering.
Third, to control the moss, control Wang antifreeze. For rapeseed that has been bolting and has a height of 30 cm or more and the growing point (inflorescence) is exposed or has blossomed, the main moss should be removed with a blade on a sunny day to eliminate the threat of freezing damage during the winter and reduce the main The nutrient consumption of stems is conducive to the germination of the lower dormant buds and the loss of yield due to freezing damage of the main stem. For some of the prosperous plots, 40-50 kg uniform spray of 80-100 ppm paclobutrazol solution per acre should be selected to prevent excessive growth of rape and enhance the cold resistance of rapeseed.
Fourth, the use of moss fertilizer, anti-increase income. The fastest growing rapeseed in spring is the period when the rapeseed needs the most fat. Should apply fertilizer in time to increase the number of branches and buds. Fertilizer application should be classified according to growing conditions. Generally can apply Urea 8-12 kg. On the bottom of the foot, Miaofei more, steady growing, good seedlings should be less applied, so as not to cause greed and green lodging; the seedlings weak seedlings, weakness in the field soon to apply early, and appropriate amount of multiple facilities. Potassium chloride 4-6 kilograms may be added at the same time when applying the nourishing fertilizer to promote the growth of rapeseed, increase lodging resistance, and resistance to disease. Boron-deficient soil and base fertilizer without application of boron fertilizer should be sprayed with 1-2 times of 0.2% borax aqueous solution (dissolved in warm boiled water) during the bud stage to prevent rape from “floweringâ€.
Fifth, do a good job in the detection and prevention and control of Sclerotinia. The prosperous plots in the previous period had poor ventilation and light transmission, and the disease resistance of rapeseeds was reduced. Sclerotinia sclerotiorum was prone to occur during the flowering stage and during the fruit development stage. It is necessary to intensify the monitoring and reporting, and do a good job of prevention and control in a timely manner to reduce the risk of S. Before the flowering stage, when the incidence of plant leaves reaches 10%, it is necessary to snatch the net with 40% sclerotium net 0.1-0.2 kg or 50% carbendazim WP 0.1-0.2 kg watered 40-50 kg Focus on the plant The lower stems and leaves are sprayed on the ground.
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