Several layers of film are needed for arch insulation
For autumn stubble sheds that are mainly planted with peppers and eggplants, when the minimum external temperature drops to 10 ° C, two membranes should be set to enhance the thermal insulation of the shed. When the minimum temperature in the shed drops to 8 ° C, three membranes can be added to the hanging vine wire to further improve the thermal insulation. As the temperature continues to drop and the vegetable growth stagnates, the vegetable grower can untie all the hanging ropes, close the plants together, and then directly cover the plants with a film to ensure that the existing vegetables on the plants are not frozen, and extend the storage time to sell Better price.
For arched sheds such as Artemisia annua, the setting of two films and three films can be the same as that of spring stubble vegetables. The four-membrane small arch shed can be seen from the width of the rafters, and the appropriate arch is selected to support the small arch shed.
In the past two years, the cultivation of spring watermelon has been good. In the early spring, when the watermelon was planted in the arched shed, it was in the low temperature season. In order to improve the thermal insulation of the shed, the vegetable farmer came up with many tricks, and the 6-7 layer film covering method was one of them.
Three layers of film are set on the arch shed frame. The first film refers to the bare greenhouse film outside the shed. The second film can be 20-30 cm away from the lower end of the shed film. The poles and wires are set up according to the arc of the shed. Film, the bottom ends of the two sides are covered with soil tightly. The joints of each film are overlapped by about 10 centimeters and clamped tightly with iron clips; the third film is under the second film. The installation measures can be the same as the second film and the distance from the second film Can be increased appropriately. The first film, the second film, and the third film not only require better light transmittance, but also better anti-fog and dripping properties, so as to avoid the opposite effect caused by dripping water and mist.
Small arch sheds can also be supported in the arch sheds, which are covered with films after inserting arches of different lengths. If it is 7-membrane cover, three small arch sheds should be set from the outside to the inside. The length of the bamboo wedge is 4 meters, 3 meters, and 2 meters in order; while some farmers choose 6-membrane cover, only 2 small arch sheds are added Yes, the length of the bamboo wedges used is 4 meters and 2.5 meters.
A film covering the ground is the seventh film. The seventh layer is the layer closest to the vegetables, and its quality has a great effect on heat preservation. After the watermelon is planted, it should be covered with mulch immediately, which not only plays a role of heat preservation, but also has a certain herbicidal effect. It is necessary to choose a mulch with uniform transparency, flat and bright appearance, uniform thickness, and good horizontal and vertical tensile forces.
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