In the autumn awning, which is mainly planted with peppers and eggplants, when the minimum temperature in the outside world drops to 10°C, two membranes should be installed to enhance the insulation of the greenhouse. When the minimum temperature in the shed drops to 8°C, three membranes can be added to the wire to further improve the insulation. As the temperature continues to drop, the growth of vegetables will be stagnant. The vegetable cultivator can unwind all the vines, bring the plants together, and then cover the plants directly with the film to ensure that the vegetables on the plants are not affected by freezing injury and extend the storage time so as to sell Better price.
For the arbors planted with Artemisia halodendron, the setting of the second film and the third film can be consistent with the situation of the film forming of the spring wolfberry vegetables. On the other hand, the small arch of the four membranes can see the width of the dice and select the proper arch to prop up the small arch.
In the past two years, the spring planting of watermelon has been performed well. In early spring, watermelons in greenhouses are in low temperature season. To improve the insulation of greenhouses, vegetable farmers have come up with many tricks, and the coverage of 6 to 7 membranes is one of them.
A three-layer membrane is arranged on the arch shed structure, and a film means a bare greenhouse film outside the arch shed; two membranes may be 20 to 30 centimeters from the lower end of the shed film, and a bamboo pole and an iron wire are erected according to the arc of the arch shed using the post, and are set on the bamboo raft and the iron wire. Membrane, both sides of the bottom of the cover with soil tight, each piece of film overlap at about 10 cm, with iron clips tightly sealed; three membranes are under the two membranes, installation measures can be the same as the two membranes, and two membranes Can be increased appropriately. A film, two films and three films not only require better light transmission, but also have better anti-fog properties and drip properties, so as to avoid adverse effects due to dripping and fogging.
Within the shed, small arches can be propped up, covering the arches with different lengths and covering the membrane. If the membrane is covered by 7 membranes, three small arches are to be set from the outside to the inside. The length of the used bamboo rafts is 4 meters, 3 meters, and 2 meters in order. If some vegetable farmers choose to cover 6 membranes, only 2 small arches are added. Yes, that is, the length of bamboo pole used is 4 meters and 2.5 meters.
A layer of plastic film covering the ground is the seventh film. The seventh film is the film closest to the vegetable, and the quality of the film has a great influence on the heat preservation. Immediately after planting, the watermelon should cover the mulch, which will not only play a role in keeping warm but also have a certain weeding action. To choose the same transparency, the appearance of smooth, bright, uniform thickness, horizontal and vertical tensile force are better to cover the film.
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