Rape winter and spring field management technical points

1, thinning. Due to large seeding volume and uneven sowing, coupled with the drought in this year's autumn crops, seedlings are crowded and ridges are often cut off. For plots that have not yet been seedlings, they should grasp the seedlings and remove them by thickening and thinning.
2, before the winter soil, cover grass. Protecting the stem and heart is the key to antifreeze. By cultivating soil and covering grasses to ease the rapid changes in the temperature of the stem segments, the transpiration rate of the leaves is also reduced. In the case of warm and wet winter weather, the roots can be rammed. In addition, 150-250 kg of straw can be used per acre to cover the seedlings before winter, and the temperature can be kept to prevent air leakage.
3, re-apply wax fertilizer, stable application of fertilizer. In the early winter, topdressing organic fertilizers between rows, such as compost or human excreta 15 to 20 Tam/mu, plus pond mud 100 to 150 Tam/mu. The application of manure before or during the convulsions of rapeseed is generally applied at a rate of 10 to 15 kilograms per gram of urea. Poor seedling growth, but also insufficient wax fertilizer, there is a tendency to force the field, the manure should be applied early and heavy stable. On the contrary, do not apply fertilizer or see seedlings. For the field where no fertilizer is applied to the base fertilizer, boron fertilizer must be sprayed during the flood season, spraying 50 kg of 0.2% borax solution per acre.
4, to prevent early death and early flowers. According to the weather forecast, this year is warm winter weather, prone to early pods and early flowers, so that the cold resistance of rape can be reduced, and susceptible to frost damage caused by reduced production. Therefore, the rapeseed field with early, vigorous growth, and tendency to grow crops should be controlled long before and after December 20th for spraying rapeseed paclobutrazol solution. If there is already an early harvest, choose sunny days when the temperature is high and pick up the appropriate amount of quick effect. Nitrogen fertilizers increase branch angles.
5, Qinggou anti-staining. Open a good three ditch, so that the three-channel support. Pay attention to frequent dredging, so that there is no stagnant water in the fields after the rain to prevent waterlogging and diseases.
6, control of pests and weeds. (1) Sclerotinia: In the first flowering stage of rapeseed to flowering stage, (that is, the flowering of the main inflorescence of 95% of the plants in the whole field starts, the first spraying is performed), generally 50% of the carbendazim WP per acre. 80 to 100 grams of water spray 75 kg. Spray once every 10 days, continuous control 2 to 3 times. (2) Control of aphids: When seedlings and convulsions have 20% of alfalfa strains, they can use 10% alfalfa net wettable powder 3000 to 5000 times liquid and spray 75 kg per acre. (3) control of weeds: generally available per acre 10% Gaixiling 50 ml, in the weeds 3? 5 leaf phase, watered 40 kg spray.

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