First, the main symptoms of mild frost injury: only a few large leaf victims, the local atrophy of the damaged leaf layer was gray.
Technical measures: 1. Clear up the ditch, gutter, and ditch in time, eliminate snow water, reduce the humidity in the field, and use the soil in the ditch to root the roots and promote the growth of rapeseed.
2, with boron fertilizer 50g, potassium dihydrogen phosphate 100g, carbendazim 150g mixed with water 50Kg, evenly sprayed on sunny days. Where conditions permit, we can spread manure such as plant ash.
Second, the main symptoms of moderate freezing injury: Half of the victims of the leaf, the victim leaf layer partially or most of the atrophy, scorch, but the heart is normal.
Technology and measures: 1. Clear up the ditch, waist ditch, and ditch in time, eliminate snow water, reduce the humidity in the field, use the soil in the ditch to cultivate roots and promote the growth of rape.
2, according to growing conditions, can be applied urea 3-5Kg per acre, combined with boron fertilizer 50g, potassium dihydrogen phosphate 100g, carbendazim 150g mix mixed water 50Kg, evenly sprayed on sunny days. Where conditions permit, we can spread manure such as plant ash.
Third, the main symptoms of severe freezing injury: Most of all the victims of the leaves, the victim's leaf local or most atrophy, scorch, the heart is normal green leaves, plants can still grow
1, promptly clean up the ditch, waist ditch, ditch ditch, eliminate snow, reduce the humidity in the field, the use of clean soil ditch roots, promote rapeseed growth.
2, according to growing conditions, can be applied per acre topdressing urea 5Kg, combined with boron fertilizer 50g, potassium dihydrogen phosphate 100g, carbendazim 150g mix mixed water 50Kg, evenly spray on sunny days. Where conditions permit, we can spread manure such as plant ash.
Fourth, lethal freezing injury: all large leaves and heart are wilting and scorching, tend to die.
Technology and measures: The dead plants are ploughed into the soil as green manures to increase soil fertility and control soil-borne diseases. Where conditions permit, fresh potatoes, fast-growing vegetables, etc. can be changed to try to recover losses.
V. Early prevention of frost damage in the future to ensure a good rapeseed harvest
1. Select cold-resistant and frost-resistant rapeseed varieties that are mainly pushed by the agricultural sector, and do not purchase uncertified rapeseed varieties.
2. The sowing date is generally from September 15 to October 17, premature and late will reduce the anti-freeze ability of rapeseed.
3, seedlings should be a reasonable fertilization, cultivation of winter seedlings. It is necessary to appropriately increase the application rate of top dressing to promote early-onset and strong-seedlings, and to appropriately control nitrogen fertilizer and increase the application rates of phosphate fertilizer and potash fertilizer.
4, before the winter solstice, cultivator weeding, earthworms, timely cleaning Sangou, reduce wet damage. Where conditions permit, straw mulching can be carried out to increase the temperature and maintain water, so as to improve the cold-resistance and anti-freeze ability of rapeseed.
Disclaimer: Some articles in this website have been transferred from the Internet. If you are involved in third party legal rights, please inform this website. phone
Shaanxi Kang New Pharmaceutical co., Ltd. , https://www.anabolicsteriod.com