Ventilation is an important factor in the cultivation of protected vegetables. Poorly ventilated sheds have high humidity and are prone to vegetable infection. In actual production, due to the insufficient height of some sheds, the environment of the shed is difficult to adjust, resulting in serious diseases such as gray mold and disease in the shed. If the height of the greenhouse is 5.5 meters and the span is 12.5 meters, the high span ratio is within the appropriate range, the environment inside the shed is good, and the disease occurs less. In contrast, there are still many sheds with a high degree of uniformity, spanning 15 meters, so that the sheds with large height and small span are poorly ventilated, resulting in serious vegetable diseases in the shed.

It is understood that in actual production, many sheds have a situation where the height is not large enough. Although such sheds also have ventilation effects, the air is difficult to circulate to the front face, resulting in a large front face humidity, which makes certain diseases The period of occurrence is prolonged and difficult to control. Therefore, for a shed with a large height and a large span, it is important to enhance the ventilation effect in the front position of the shed. In this regard, the author makes the following recommendations:

First, install ventilation equipment

Fans, fans and other machinery are commonly used ventilation equipment in factory nursery sheds. Through mechanical ventilation, the air circulation in the shed can be smooth, which is convenient for adjusting the environment inside the shed. In view of the current comprehensive power layout in the vegetable farm, the author suggests that the vegetable farmer may install such a fan fan to enhance the ventilation effect in the front position of the greenhouse. In general, installing 3-4 units in a 100-meter greenhouse is enough to circulate the air in the front of the booth.

Second, according to the external temperature, properly expose the front face

For the undercut shed with a large height and a large span, in order to improve the ventilation effect in the front position of the shed, the front face can be appropriately opened for ventilation according to weather and temperature conditions. The front wall of the digging-type greenhouse is high, and the ventilating opening of the front face is usually located at the top of the vegetables, and the vegetable farmers can appropriately open the front air outlet according to the outside air temperature, which is also a better measure to promote the ventilation of the greenhouse. As far as the current temperature is concerned, it can be opened when the outside temperature reaches 15 °C in the morning, but it cannot be opened too much at one time, so that the ventilation is not strong to the insulation of the greenhouse or affect the growth of vegetables.

The third is the open front face ventilation can be set to adjust the wind film

There are many sheds whose front face is open, that is, the height of the front face wall is low. When the front face of the shed is opened and the wind is blown, the air enters from the bottom, which may affect the fruit in the middle and lower parts. In order to ventilate and dehumidify, and not affect the growth and quality of the fruit, a wind regulating membrane can be placed at the front face. The setting of the wind regulating membrane can be borrowed from the installation method of Zhang Guanzhuo, Xiaonanzhuang Village, Luocheng Street, Shouguang City, Shandong Province. The front face (the arch shed is on both sides) is first installed with inverted “L” type steel bars, and then the wind regulating film is laid. On the steel bar, the upper end of the wind regulating film is kept at a distance of 10 cm from the film, while the lower part is compacted. In this way, the air entering from the front face tuyere is blocked by the wind regulating film, and then enters from the opening of 10 cm between the wind regulating film and the shed film, and the air blocking and ventilation through the wind regulating film is slowed down, thereby achieving the middle position. The ventilation effect can avoid the rapid airflow during ventilation and the large temperature change affecting the fruits of vegetables.

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