Since the autumn broadcast last year, the temperature in the main producing areas of the Yangtze River has been relatively high. The growth of rapeseed seedlings is generally better than in previous years, and the growth process is 7 to 15 days ahead of schedule. In response to the current rapeseed growth and spring climatic conditions, the Ministry of Agriculture Oil Materials Experts Steering Group and the National Agricultural Technology Extension Service Center have proposed the 2017 spring rape field management technical guidance. The first is to pursue the manure. Spring rapeseed grows rapidly and is an important period for fertilizer. According to the seedling situation this year, the general field can apply 5-8 kg of urea when the height is about 15 cm, and appropriately add 3 to 5 kg of potassium chloride to enhance the resistance and resistance of rapeseed. For fields with obvious de-fertilization and insufficient growth, early application and multi-fertilization should be applied, and less or no fertilizer should be applied to the field with good fat and good seedlings. The second is to clear the ditch. The rape flowering period is sensitive to waterlogging. This year's flowering period is significantly advanced, which will cause the extension of the flowering period and the spring rainfall. It is also easy to cause root hypoxia and vitality, increase the incidence of root rot and other diseases, and seriously affect the yield and quality. Drainage and dehumidification should be done in advance to keep the “three ditch†unblocked, improve soil permeability, and mitigate the effects of waterlogging and sclerotinia. The third is "one promotes four defenses." This year's rapeseed growth process is 7 to 15 days earlier than normal, which may aggravate the spread of sclerotinia sporozoites and cause premature aging. In the early flowering period, we should do a good job of “one promotion and four preventionsâ€, spraying 25% of prochloraz 50ml, 30g of available boron, 60g of potassium dihydrogen phosphate and 500g of urea per acre. At the same time, with the application of a protective agent such as Bi-protection, the yield-increasing effect is better. The fourth is to control mites. Due to the high temperature in winter last year, the occurrence of aphids in the main producing areas of the Yangtze River was heavier than in previous years. In the later period, the climate uncertainty is large, and the locust damage may be aggravated in some areas. It is necessary to do a good job in controlling the locusts. When the rate of mites is 8%, the amount of 10% imidacloprid WP can be sprayed with 40-60 g of water and 40-50 kg of water per acre to control the mites. More pesticide knowledge , please pay attention to China Pesticide Network
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