Winter greenhouse vegetable watering principles
The specific time for watering sunny and not overcast should be selected according to different weather conditions. Strictly abide by the principles of watering on sunny days, little or no watering on cloudy days, and no watering on rainy and snowy days, especially to avoid watering in cold and overcast weather. So as not to cause the ground temperature to drop, cause the roots of vegetables to die, or cause the air humidity in the shed to increase, leading to the occurrence and spread of diseases.
Watering small and not large, the temperature is low in winter, and the water demand of vegetables is small, so the watering frequency should be less and the watering volume should be small. Under normal circumstances, small amounts of water are interlaced, and the amount of watering is only half of that in summer. For example, overwintering cucumbers can be watered in alternate rows, twice in small rows, once in large rows, and alternately.
If the water temperature is not cold, the water for watering should be preheated in the shed first, and then watered when the water temperature is close to the ground temperature, and the water temperature should not be lower than 12 ℃. Can not directly use river water, reservoir water, and cold water in ponds for irrigation. After watering is complete, close the vents or even the vents, so that the temperature in the shed reaches 30 ° C or higher, and it is stable for 1 to 3 hours.
Watering the vegetables in the dark and not in the winter should insist on under-membrane dark irrigation, or micro-irrigation under the membrane, which can effectively prevent evaporation of ground moisture, reduce air humidity in the greenhouse, and prevent diseases. The use of micro-irrigation has a positive effect on the balance and coordination of water, fertilizer, gas and heat required for vegetable growth, especially the use of micro-irrigation in the early and mid-terms is conducive to promoting root control, controlling air humidity in the shed, and reducing the occurrence of pests and diseases. It can also effectively control the amount of water, reduce the leakage of deep water and fertilizer loss, improve soil structural performance, promote crop growth and development, and improve the quality of vegetables.
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