1, irrigation antifreeze: 5 to 7 days before the frost, a foot of water to the rape field, can be irrigated from the plastic film at the mouth, you can also use mud to block the field outlet, filling the trench 2/3, so that water slow Slowly infiltrate into the cocoon. 4 to 5 days before frost, 300-500 kilograms of fire-soil ash or decomposed dry-pig, cow dung and rapeseed base are used per acre. Before 7 to 10 days of frost, use 15% paclobutrazol wettable powder 60-70 grams per acre, spray 50 kilograms of alcohol, or spray 50-60 kilograms of 0.1%-0.2% potassium dihydrogen phosphate solution.
2, plastic film protection: rapeseed mulch film covering the entire growth period, usually to the Tanaka patrol inspection, found that the wind blown mulch to promptly cover and soil pressure. If there is a small hole in the film, it should be plugged with fine soil in time. If there is a large piece of film damaged, it must be cut in time to cover the new film and compacted with soil.
3, Qiao Shi manure and boron fertilizer: Coated cultivation of rapeseed manure than the conventional cultivation of 6 to 7 days ahead of time, generally in the high 4 to 5 cm when the topdressing, preferably in the rain before the snow 1 ~ 2 days; rapeseed fields with medium soil fertility and seedlings can be topped with 10-15 kg of urea per acre. When topdressing, use a bamboo spatula to break a hole in the mulch to deepen the urea into the soil. Boron-deficient rapeseed fields can be sprayed with 50-60 kg 0.1% borax solution or 0.1%-0.2% potassium dihydrogen phosphate solution for 1 to 2 sprays per acre during flood season and flowering period.
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