How to grasp field management in winter rapeseed
The growth of winter rapeseed is divided into three stages, the pre-winter growth period, the wintering period and the winter growth period. Field management should focus on technical management in phases.
First, winter field management
1. Timely seedlings: After emergence, generally 2 to 3 true leaf time seedlings, 4 true leaves when Dingmiao, planting density of 4 to 60,000 per mu. 2. Weeding and weed control: 1 to 2 cultivators are used after emergence to eliminate weeds, increase the temperature, keep the moisture content and promote seedling growth. Chemical weeding can be carried out when 2 or 3 true leaves of rapeseed are used, and 12.5% ​​of herbicide can be applied to 40 liters of water per acre with 40 ml of herbicide, and sprayed when the weather is fine. 3. Irrigation fertilizer: The land with irrigation conditions should be combined with soil moisture and timely irrigation and topdressing, topdressing with nitrogen fertilizer, generally about 5 kg of urea topdressing per mu, in order to promote seedling growth, to ensure strong seedlings before winter.
Second, wintering field management
1. Overwintering winter water: The winter rapeseed area in our province is arid, windy, with little precipitation, and with severe water evaporation. Winter irrigation should be carried out in areas where conditions permit, and it is usually advisable to freeze the soil before freezing overnight. 2. Repression and compaction: Repression can reduce the porosity between soil particles, damage the soil capillary, cut off the evaporation channel, thereby reducing water evaporation, and play a role in water conservation. In general should be suppressed after all the leaves dry 1 or 2 times. 3. Protect the leaves and prevent foraging. In winter, management should be carried out to prevent the winter rape field from feeding by livestock and other animals, destroying the growing point, and causing the wintering rate to decline.
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