Vegetable experts pointed out that severe weather such as continuous cloudy (snow) days has a great impact on the growth of vegetables in winter. The majority of vegetable growers must not only do a good job of “insulation, fill light,†but also prevent vegetables from “light damage†after the weather turns fine.
Wang Shufen, a researcher at the Vegetable Research Institute of the Shandong Academy of Agricultural Sciences, told the author that in the winter, a few days of cloudy (snow) days have a great impact on the growth of greenhouse vegetables, which could easily lead to production cuts and even yield losses. In order to reduce losses, vegetable farmers should listen to the weather forecast in time and spray anti-diseases or cold-resistance agents in advance before the arrival of the shade (snow) days. The ventilation should be as low as possible, and the grass should be covered in advance in the afternoon to make more savings in the shed. Heat, but also should increase the insulation measures.
Experts suggest that, as long as there is no snow during the cloudy days, the farmers can uncover the haystacks on the roof before the noon, so that the crops can be scattered in the sun. If there is light compensation, they can turn on the lights and fill in the light at the same time. thatch. If the night temperature is low, conditions can be properly replenished.
"After the weather turns fine, special attention should be paid to preventing vegetables from suffering from 'light damage' during the exposing process." Wang Shufen said that under strong sunlight, the transpiration intensity of the leaves is large, while the lower ground temperature affects the roots to absorb water, and plants do not receive water supply. The leaves will lose water quickly. "Like a person's dehydration, when it is severe, the leaves will wilt at a noon time."
Vegetable experts warned that we should adopt a method of gradual disclosure to avoid "light damage." If the plant leaves are found to be wilted after the exposing process, cover the grass plant immediately and wait until the vegetable plants recover. If the plants are found to be wilting, they can be sprayed with warm water or nutrient solution (0.2% to 0.3% of a mixture of urea and monobasic potassium dihydrogen phosphate) at the same temperature as the shed. Amino acid fertilizers can also be sprayed to reduce wilting. It can supplement nutrition.
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