1. The purpose of ventilation in greenhouses: After emergence, rice should be ventilated and tempered according to the temperature in the shed and the outside air temperature, mainly to reduce the temperature inside the shed, increase the air flow inside the shed, remove moisture, and prevent the seedlings from becoming obscene. As soon as possible, seedlings adapt to the outside temperature and improve the quality of transplanting.
2. Ventilation mode of greenhouses: At present, the reclamation area and local areas mainly include two ventilation methods: ventilation of the greenhouse, ventilation of the shoulders of the small windows, and three ventilation methods of the shoulder of the shutter. Practice has proved that the best ventilation of the roller shutter shoulder, ventilated roof and ventilation of small windows has been gradually replaced. The ventilation of the roller shutter has the advantage that the cold wind does not directly blow on the seedlings, which has little damage to the seedlings, thorough ventilation, rapid cooling, and is conducive to cultivating strong seedlings.
3. Principles of Ventilation in Greenhouses: Principles should be based on the principles of "Temporation of temperature, lift up of greenhouses," "first open small mouth, and then open large mouth", "first back, then positive", "sunny pass, rainy day also pass" and other principles Ventilation management.
4. Suggested ventilation method: Clear air ventilation in the morning and close the shed in the evening. If ventilation is performed at the highest temperature at noon, the seedlings are hot and cold, prone to bacterial wilt; vents must change with the age of the leaves, ventilation The location of the mouth should also be changed to avoid prolonged ventilation and the dwarf seedlings near the tuyere are dwarfed due to the low temperature. Rice 1 leaf 1 small ventilation period, in the greenhouse to the top of the greenhouse film to open a foot high triangular shape, the temperature in the greenhouse is not higher than 28 °C; 2 leaf 1 heart ventilation, in the greenhouse to open the film one meter High triangular shape, greenhouse temperature does not exceed 25 °C; 3 leaves after 1 heart period of large ventilation, greenhouse two shed film fully uncovered, shed temperature at 23 °C; after 3 leaves follow "Ning cold do not heat" The principle is that when the temperature is around 10°C at night, it is not necessary to close the shelter. In the high-temperature winds of high winds, do not worry because of the shed of the shed of the shed of the film and the shed is shed. The pods are roasted and burned by high temperature, and yellow leaves will appear on the leaves, affecting photosynthesis and becoming weak seedlings.
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