Youyan 9 is the first recessive genic male sterile two-line yellow-seed double-low, high-efficiency and high-quality hybrid rape variety bred by Guizhou Oil Research Institute. Its high-yield cultivation and management techniques: fine soil preparation, adequate basal fertilizer application, timely sowing, reasonable close planting, strengthening fertilizer and water management and pest control.

1. Intensive cultivation: After harvesting the late rice with sufficient base fertilizer, the accumulated water should be removed in time, the fields should be aired, and the tractor should be used to plow and break the soil. The width of the whole carriage is 1.5m-2.0m, and the row spacing is 40cm. Compound fertilizer (20:10:15)10 kg mixed Longyan was applied per mu to produce organic matter.

If drilling is used, a ditch with a depth of 5- 10cm and a row spacing of 3cm shall be opened first, and a drainage ditch shall be opened at the same time.

Second, sow in time and evenly. The sowing time should be from the end of 65438+ 10 to the beginning of 165438+ 10, which is determined according to the previous crops. Early sowing is beneficial to prolong the vegetative growth period, and the plants are strong and the flowers are large in the later stage. Therefore, the fields planted with rape should choose the fields planted with single-season rice in the first half of May, harvested in the first half of June at 5438+ 10, or harvested with double-season rice in the first half of June. When sowing, if drilling is used, the seed consumption per mu is 300 grams (germination rate is above 80%); If the amount of seed for direct seeding is 350g per mu, mix the seeds with fine sand with1.5kg borax, and then sow evenly.

Third, timely thinning, fixing and replenishing seedlings When rape has 6-7 leaves, thinning and fixing seedlings should be carried out about 30-35 days at the seedling stage according to the ratio of 15cm? 25cm standard seedlings should be transplanted and replanted in the open space where seedlings are lacking and do not emerge, and about1.5-1.8000 basic seedlings should be planted reasonably close per mu. After the seedlings are fixed, root fertilizer is applied to the water with 1000 kg manure water or 6.5 kg urea per mu.

4. Fertilizer and water management 1, moisture preservation and drought resistance. After sowing, the surface of the compartment should be thoroughly watered to keep the surface moist, which is beneficial to seed germination; In case of drought at seedling stage, it should be watered in time to facilitate the growth and survival of seedlings; Irrigation with flowering water and pod water after bolting takes a long time to blossom and bear fruit, and requires a lot of water. Irrigation can be carried out for 3-4 times according to soil moisture.

2. Fertilize rationally, add boron fertilizer and topdressing seedling fertilizer, and topdressing 46% urea10-12kg per mu when five true leaves grow. After bolting stage, external fertilization is mainly carried out. 0.5 kg of potassium dihydrogen phosphate, 0.2 kg of urea and 50 kg of water are used per mu during flowering to prevent rape from flowering and fruiting. The yield and quality of rapeseed can be improved by spraying 2%-3% calcium superphosphate aqueous solution on the leaves of pods at mature stage.

When boron fertilizer is added, a large number of flowers will appear in rape without knowing it, or the petals will dry up and shrink, and the yield will be seriously reduced. Spraying 0.02% boric acid solution at bolting stage and early flowering stage combined with root topdressing can improve the effective branch number, pod number per plant and 1000-grain weight of rape and prevent flowering and fruiting.

Five, pest control The main diseases that harm rapeseed are Sclerotinia sclerotiorum and virus disease. Sclerotinia sclerotiorum mostly occurs in the flowering and fruiting period of rape, and it can be prevented by spraying thiophanate or carbendazim aqueous solution. Viral diseases can be alleviated by controlling aphids.

To control aphids, 650g of 40% dimethoate emulsion can be used per mu, and 1500-2000 times of water spray or 3500-5000 times of 50% pirimicarb wettable powder spray can be used.