In recent years, the main problems in the production of sunlit greenhouse vegetables in the facilities park during the wintering period have been: the vegetable farmers have difficulty in controlling the late blight, gray mold, and leaf mold of vegetables during the production management process, thus causing the vegetable production in the greenhouse. Serious harm.
To this end, after a number of years of practice and exploration, science and technology commissar Li Yusu of the Yangling modern agricultural facilities park in Shaanxi, who has been engaged in vegetable cultivation for more than ten years, has found the most likely causes of vegetable pathogenesis and the incidence of vegetables in greenhouses. Through the investigation of Li Yusu, it was discovered that in the interior parts of the two gables of the greenhouse shed and in the front of the shed, due to poor ventilation, poor air convection, resulting in condensation of the plants and the greenhouse film, resulting in excessive humidity in the shed, resulting in serious disease. occur. Later, Li Yusu produced a S-shaped natural draft tube, installed in a greenhouse shed, 1 meter to 2 meters from the gable front of the gable (burying parallel to the shed pipe rack), and installing 2 S-shaped sheds per standard shed. Ventilation pipe, install four S-shaped ventilation pipes in a 100-meter shed, and install three S-shaped ventilation pipes in 70-80 meters.
Then, after pulling the curtain every morning, when the temperature in the shed rises by 2°C~3°C, according to the weather conditions of the day, the S-shaped ventilation pipe in the shed is opened for ventilation for a short period of time for ventilation and dehumidification.
The humidity in the shed is reduced from 80% to 100% to 60% to 70% within 1 to 2 hours due to the humidity in the S-tube, and the humidity in the shed without the S-pipe is reduced from 80% to 100% to 60%. ~70% takes 4 to 5 hours, a difference of about 3 hours.
At the same time, the incidence of vegetable diseases in the sheds where S-shaped pipes are installed is generally 10% to 30%, and the incidence of sheds without S-shaped pipes is 50% to 70%. Due to the decrease in the incidence of disease, the number of medications and the amount of medications dropped drastically. The amount of medicines used in sheds with S-tubes is half as low as that without the use of S-tubes. This saves labor by 50%, and reduces the cost of pesticides by about 500 yuan. Pollution standards.
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