How to ventilate greenhouse vegetable cultivation:
Ventilation is also a very stressful technique in the process of cucumber seedlings. Ventilation on the seedbed is mainly to adjust the environment of the seedbed, so that the cucumber seedlings can obtain proper temperature and humidity, and the carbon dioxide gas can be replenished in time through greenhouse ventilation.
Vegetable farmers carry out cucumber seedlings in their own plastic greenhouses. Unlike factory seedlings, the conditions for vegetable farmers are generally poor. Especially in controlling the temperature and humidity of seedbeds, all of them must be mastered by hand. If they are slightly lost, they will be abandoned. In the greenhouse, a small plastic arch shed is used for seedling cultivation. When the seedlings are in the morning, the ventilation is started when the temperature reaches 25 °C in the morning. When the temperature drops to 18 °C in the afternoon, the ventilation is stopped. The ventilation should be gradually carried out, and the ventilating port gradually increases with the increase of the temperature to avoid Ventilation is too fast and too strong. Plastic greenhouses usually have two seams or three seams. First open the upper seam to ventilate, and then gradually open the middle seam to ventilate, and finally put the bottom wind. When starting ventilation, it is necessary to ventilate a slit at intervals, and support the film with a wooden stick. The air outlet should be rotated every day. When the wind is relatively large, let the wind blow on the leeward side to prevent the cold wind from blowing directly onto the seedlings.
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The air, which is drawn in by the motor of a Heat gun, is electrically heated. The desired temperature can be set to between 100 to 600 and can be maintained electronically, independent of the required are flow rate. Various possible applications include thawing, drying, tinning, sharping, setting and removal of old coats of paint and staring adhesive processes.
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