The first is to choose suitable varieties. Select high-yield, multi-resistance double-low rapeseed varieties, the upper reaches of the Yangtze River can choose oil research, Rongyou, Sichuan oil, noxious and yellow and other low-quality varieties. In the middle reaches of China, hybrids such as Huaza, Zhongyouza, Zhongshuang, Huashuang, Xiangza miscellaneous oil can be used. In the downstream areas, Yangyou 6, Ningyou 14, Suyou 1, Zheshuang 72, and Huyou 16 can be selected.
The second is to focus on contiguous planting. It is forbidden to plant flowers with non-high-quality varieties to ensure that the double-low varieties are contiguous, and where conditions permit, they will strive for one product in one town to ensure the quality of double-low rapeseed.
Third, timely sowing and nurturing strong seedlings. To select a soil with fertile soil, convenient irrigation and drainage, and a non-cruciferous vegetable plot as a seedbed, the ratio of seedbed to field is 1:5, and the maximum is 1:10. And to do a fine land preparation, ditching, basal fertilizer, Mushi human livestock manure 1000 kg, boron 0.5 kg. The suitable sowing date for the upper and middle reaches of the Yangtze River is generally at mid-September and mid-September, and the suitable sowing date for the lower reaches of the Yangtze River is in mid- and late September.
The fourth is to open up the land preparation and scientific fertilization. Timely ditch and ditch, so that the three-channel support, rain and dry fields, combined with the application of basal. The total amount of fertilizer applied in Daejeon is 12.5 to 15 kg per hectare of pure nitrogen, 6 to 8 kg of phosphorus pentoxide, and 8 to 12 kg of potassium oxide. 50% of total nitrogen application, 80% of total phosphorus and potassium fertilizers were used as base fertilizers. The application of borax 0.5-0.75 kg per acre at the end of the rapeseed and bud stage spraying 0.2% borax solution, live rape in particular pay attention to late fertilizer, to prevent premature aging.
The fifth is to reasonably determine the planting density. According to the characteristics of varieties, soil fertility levels, transplanting methods, and early cultivars, it is reasonable to determine appropriate transplanting or direct seeding density. Transplanting generally about 8000 per acre, about 15,000 live broadcasts.
Sixth, prevent pests and weeds in time. Before the winter, according to the field sod instead. In the early flowering period, prevention and treatment of sclerotinia should be done well. When there are 20% locust strains in the field and more than 300 pods per 100 strains, pesticide sprays should be used in a timely manner.
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