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Covering nonwovens in winter greenhouses
In winter, greenhouse vegetable, eggplant, beans, and other off-season vegetables are produced in greenhouses. Generally, plastic films are used to cover or cover shade nets and rice straw sheets. If a single layer of plastic film is used for covering, although a good heat preservation effect can be obtained, the humidity in the shed is relatively large and there are water droplets on the leaf of the crop, which easily leads to leaf disease and fruit rot. If stamped rice straws are used to cover the flowers, the scale of the horticultural production will not be able to be adopted. Even individual farmers, a 1 mou shed, will take 2-3 hours to uncover every day. In recent years, we have used long-fiber non-woven fabric test to cover non-woven fabrics in small and medium sheds in greenhouses. This is better than multi-layered film coverage. The results of many years of testing are summarized below. First, the insulation effect is good. Non-woven fabrics (80-100 g/m2) + plastic film covering, generally keeping the temperature above 8°C in the growing layer of the crop, harvesting tomato, eggplant, pepper, cucumber, etc. in the middle and lower reaches of the Yangtze River Anti season vegetables. Specific methods: mulching film, trench covered with straw, and then according to the size of melon, eggplant and other vegetables in the greenhouse to take a small shed or in the shed, the evening cover a layer of non-woven fabric, and then cover a layer of film, or Cover the film first and cover the non-woven fabric. If the outdoor minimum temperature in winter is between 0 and -2°C, at least 8°C can be maintained in small and middle sheds. If special cold currents are encountered, a layer of non-woven fabric and a film can be added on the top. Even if the outdoor extreme temperature drops below -5°C, the small-medium shed can still be maintained above 5°C. The method of heat preservation can make normal vegetables such as tomato and eggplant grow in the greenhouse during the whole winter and the results can be normal, and obtain good economic benefits. Second, strong moisture absorption. With non-woven fabrics, there is no water droplets on the crop leaves in the shed, which can prevent and reduce the occurrence of leaf diseases and rotten fruit. Non-woven fabrics are exposed to sunlight during the day and the moisture in the fabric evaporates. In the evening, the moisture evaporating from the leaves can be absorbed. According to our results of several years of testing, disease rarely occurs. Third, save labor. Using non-woven fabrics and films, taking 1 mu of sheds as an example, two people can cover or uncover them in 10 minutes (with rice straws covering at least 1 hour each morning and evening), which can save labor. Due to the timely unveiling, it can increase the light receiving time of crops and accelerate the growth of crops. Fourth, long service life and low cost. The one-time investment of non-woven fabric (80-100 g/m2) per mu of greenhouse is about 1,500 yuan. Generally, it can be used well for more than 5 years. The annual cost is about 300 yuan. (Source: "Agricultural Technology Service" period 2004.8)