(1) The ridge cultivation combined with the mulching film is effective.
(2) Construction of underground fire or geothermal pipes and geothermal lines This measure is most effective for improving ground temperature, but the cost is too high. At present, there is basically no application in China.
(3) Reasonable temperature control during artificial concentrated pre-cooling.
(4) The bio-heater uses the straw fermentation to release heat to increase the ground temperature.
(5) Digging the cold-proof ditch This measure has low cost and remarkable effect. If the thickness of the cold insulation ditch is 5-10 cm, it is better to fill the straw weeds (preferably wrapped with plastic film) to a thickness of 20-40 cm; the depth of the cold ditch is greater than the depth of the local frozen soil 20- 30 cm is suitable; prevent the heat transfer from the soil in the greenhouse to the outside of the greenhouse.
(6) The greenhouse was built to be semi-underground.
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