Wintertime management of greenhouse vegetables
In wintering greenhouse vegetables, there are many kinds of severe weather. Unfavorable climatic conditions have an impact on solar greenhouse vegetables. In this period, the field management of solar greenhouses must be strengthened.
Warming and Insulation Measures For the sheds that have less grass curtains, thinner back walls, and poorer insulation, the thickness of the sheds should be increased. Double curtains should be used as much as possible. dry. If the temperature in the greenhouse is lower than 6°C, stoves should be used to warm up; cucumbers, tomatoes, and fruits and vegetables are mainly used for root protection, preservation and preservation.
Even the management of the cloudy days is overshadowed, and as long as the temperature is not low, we must unveil the straw curtain. If the sun is exposed for a short time, the temperature inside the shed will increase. Hanging a light curtain on the back wall of the greenhouse will also play a role of lightening and warming on cloudy days. Keep room temperature at night not less than 10°C, and strive to store more heat on the sunny back wall. The daytime temperature should be controlled at 25°C~28°C, and more than 30°C should be promptly windproof. When there are more cloudy days in winter, it should cover the mulch film earlier, increase the temperature of the ground, and reduce the occurrence of low-temperature freezing damage.
After a long period of haze and haze, the management is overcast and foggy. If it is sunny, the transpiration of vegetables will be strengthened and the roots will not be able to keep up. After sunny days, a large number of dead seedlings will grow. First, we must pay attention to covering the straw curtains to prevent flashing seedlings. After the sunny weather rises, the temperature will rise rapidly and the seedlings will drastically wilting. Attention should be paid to changes in seedlings from around 10:00 in the morning, and appropriate measures should be taken to cover the straw curtains, spray water (or foliar fertilizers) into the sheds, etc.; Water must be 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, apply the quick-dissolvable fertilizer with water, the concentration should be small; finally, after sunny days, rooting with root-promoting agent, spraying multi-element micro-fertilizer on the leaf surface to make up for lack of root absorption.
Management of snowfall During the daytime snowfall, we must roll up the grass curtains. After the snow stops, we immediately clear the snow on the shed film. The parts of the greenhouse slope that are difficult to clean are gently scraped down with a smooth wooden stick. Shed film. Snowfall at night, but also pay attention to the timely removal of snow on the straw, should use plastic film in advance to wrap the straw, to prevent the straw curtain water absorption, resulting in excessive weight of the shed body to make the arch distortion, or even collapse.
Windy Weather Management When there is a bulging phenomenon in the film, it is necessary to immediately squeeze the film line or put down some grass curtains and press it in the middle of the roof in front of the greenhouse. When the wind is encountered at night, it is best to place a straw curtain across the front of the greenhouse and press it firmly with stones.
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