Rapeseed after freezing
In the event that the weather is suddenly cold, and other measures of insulation and frost resistance are less than enough, a layer of vegetation ash is applied to the leaves and fields of rapeseed, which can directly protect the foliage. Wherever conditions permit, weeds, sawdust, husks, rice straw, etc. are used for smoke prevention and frost protection at the low temperature nights in the rape field to cover the ground with a layer of smoke to form a farmland microclimate and prevent the occurrence of freezing damage.
Spray water on the leaves in time to remove snow, ice, and frost from the foliage to prevent the rape leaves from wilting. Spray defrosting should be performed before defrosting in the morning to reduce the effect of frost on the blades.
For rape which has emerged "root pull" phenomenon, timely cultivate 7 to 10 centimeters in thickness with smashed earth to prevent rooting and dead seedlings.
For frozen canola, it must be removed on sunny days in order to promote the growth of the base and to compensate for the loss of freezing. Clearly remove the frostbite leaves with obvious water stains, and remove the leaves that are obviously whitened or dried.
After the ice and snow, the “Three Ditches†should be dredged in time to drain the water in the fields, improve the soil permeability, and reduce the damage to freezing and water.
Timely fertilization to supplement nutrients, where conditions should be followed by fire and soil fertilizer, grass ash and other hot farmyard fertilizers, can also apply topdressing available nitrogen fertilizer and phosphorus potassium fertilizer. After the harvest, the plots were fertilized as appropriate, and 5 to 7 kg of urea was applied per acre to promote branch growth. Frozen rapeseed leaves, to be generally top dressing, topdressing 3 to 5 kg of urea per acre, the poor growth of the plot can be increased by the appropriate amount, so that as soon as possible to restore growth. On the basis of topdressing nitrogenous fertilizer, apply potassium fertilizer in an appropriate amount, apply 3–4 kg of potassium chloride per acre, or spray 1–2 kg of potassium dihydrogen phosphate from outside the root to increase the cytoplasmic concentration and enhance the cold resistance of the plants. Promote grouting strong seeds. In addition, spray 0.1-0.2% boron fertilizer solution per acre about 50 kg, in order to promote flower bud differentiation, early recovery rapeseed growth, to reduce losses.
After thawing, the cultivator loosens soil in time to increase the ground temperature and promote root development. And to strengthen pest control work, the occurrence of sclerotinia and other timely spraying carbendazim, sclerotia, etc. for prevention and treatment.
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