In the northern winter, continuous yin weather, snow and windy weather, and long days of haze and sunny weather often cause serious damage to greenhouse vegetables. Therefore, to ensure safe winter vegetables and improve the yield and quality of winter greenhouse vegetables, we must actively take measures to prevent the impact of severe weather on greenhouse vegetables in winter.
First, snowfall weather
It is estimated that when the thickness of snow is about 20 cm, snow can reach 20 kg per square meter, and the snow pressure per roof of a shed of 667 square meters can reach more than 13 tons. After the snow stopped, the grass curtains were rolled up and the snow on the shed film was immediately cleaned. Be careful not to scratch the shed film. Snowfall at night, but also pay attention to the timely removal of snow on the straw, should be used in advance to wrap the straw with a plastic film, to prevent the straw curtain water absorption, resulting in the overweight of the shed body to make the arch distortion, or even collapse. After the snow stopped, the snow around the shed was cleaned and transported out of the shed area to improve the ground temperature and reduce waterlogging. You can also use snow tricks to harm your health. In the melted snow water, the nitride content is 4 times higher than that of the same volume of rainwater, the heavy water content is 1/4 less than the normal water, and the content of poisonous and harmful substances such as phenol and mercury is also lower than ordinary water. Heavy water is a kind of radioactive material and it has a strong inhibitory effect on various life processes. Therefore, it is called "dead water." Using snow water instead of ordinary water soaking, watering vegetables, can greatly reduce the harm of heavy water and increase vegetable production. According to the experiment, the cucumber seeds soaked with snow have a germination rate that is 40% higher than normal; watering cucumber seedlings with snow can increase production by 1 time.
Second, windy weather
When the shed film has a bulging phenomenon, immediately squeeze the film line or put down some grass curtains and press it in the middle of the greenhouse before the greenhouse. It is best to place a straw curtain across the front of the greenhouse and press it firmly with stones.
Third, Lianyungang
When encountering continuous dark weather, the light is weak, the calories is low, the temperature is low, the photosynthesis is slow, the material accumulation is small, and the energy consumption is large, resulting in malnutrition of the plants, slow growth, development inhibition, no easy-to-stiffness seedlings, no flowering, fruit drop, induction Disease. As long as the temperature is not too low, we must uncover the straw curtain. If the sun is exposed for a short time, the amount of light and temperature in the shed will increase; in the greenhouse, a reflective curtain will be placed on the back wall, which will also add light and warm the sky. The role; winter cloudy days should be covered in early film, can increase the temperature, reduce the incidence of low temperature damage; fill light to increase temperature, electric light and the sun is not essential difference, can be used to fill the light or short-term heat of the fire, so that the greenhouse The temperature inside should be kept above 12°C; the use of anti-dropping agents should prevent the falling of flowers and fruits; P.20 and potassium dihydrogen phosphate should be applied alternately to stimulate the trees, break the stiff seedlings, and promote hair tree; use smoke or dust for treatment. Reduce the humidity in the shelter to avoid the occurrence of diseases.
Fourth, long cloudy sky
For a long period of overcast and foggy weather, once it is sunny, the transpiration of vegetables will be strengthened, the roots will not be absorbed, the plants will wilt and the temperature will continue to rise, which will cause “roasted seedlingsâ€. If the ventilation is too aggressive, it will cause flash seedlings. One is to ventilate and cool down early, and pay attention to covering the straw curtain to prevent flashing seedlings. Can spray water (or foliar fertilizer) to the shed to ease the wilting. Second, after sunny days, watering as slowly as possible must be done before the roots are rejuvenated and then watered, otherwise it is easy to cause dead roots. If you need to top-dressing with water, you should pour small water, and apply the quick-dissolving fertilizer with water. The concentration should be small. The third is to use the root-promoting agent to irrigate the roots, spray the multi-element fertilizer on the leaves, and make up for the lack of root absorption.
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