The greenhouse vegetable production in winter was affected by the sudden drop of outside air temperature or wind and snow weather, and the ground temperature and room temperature decreased, and vegetables were often frozen and harmed. Conventional heating methods (stove, liquefied gas cylinders, etc.) can only increase the indoor air temperature and the ground temperature rise is not significant. For this reason, the author conducted a trial of the benzene board for full greenhouse warming and received good results.
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First, the new greenhouse foundation, wall, rear slope benzene board placement method.
1. The basic benzene board is placed according to the design specifications of the greenhouse. The foundation is excavated after being laid, deeper than the frozen layer, and the width is designed to be 20 cm wider than the wall. Determine the height of the benzene board according to the basic depth, place the benzene board upright on the inside of the foundation, and keep the gravity perpendicular to the soil. Then fill the ground with the sand and pour it with water.
2. The thickness of the wall of the benzene board placed brick-concrete structure is 12 cm + benzene plate thickness + gray mouth + 24 cm, benzene board is placed between 12 cm and 24 cm, 12 cm is inside, the wall is laid Water scum sand, to maintain the basic benzene board is not oppressed by the wall weight. The two walls sandwiching the benzene board are fastened to the wall height with iron reinforcement every 50 cm.
3. Post-slope benzene board is placed on the top of the greenhouse and is the top of the road. Because the strength of benzene board itself can not be placed outside the top of the slope, can only be placed on the inside. So take a solution from the inside of the hanging shed, which can be nailed to the side slope beam on the back side of the slope, and the benzene board is stitched with white ash and water to add “107 glueâ€.
Second, the old greenhouse greenhouse, wall benzene board placement method
1. The basic benzene board is placed in the greenhouse and excavated from the foundation about 25 centimeters. The width is enough for operation. After the frozen layer is over, the benzene board is placed vertically on the side of the wall and filled with water for compaction.
2. The sloping benzene board placed on the back wall shall be placed in the way of erecting the rear slope of the new greenhouse.
Third, the insulation effect
1. The ground temperature was tested in a greenhouse with benzene plates and greenhouses without benzene plates. The result was that the former was 6°C-8°C higher than the latter in the evening and 4°C-5°C during the day.
2. The temperature of the former is 4°C-6°C higher than the latter in the evening and 3°C-5°C higher during the day.
The experiment shows that this method is simple, the source of the material is easy to obtain, the effect of heat preservation is good, and the occurrence of cold injury of vegetables is reduced. At the same time, the planting species have been expanded and improved
