According to the tolerance of vegetables to humidity, vegetables can be divided into four categories: Humid type: Leafy vegetables such as cabbage and celery have tender tissues and are not drought-tolerant. The suitable air humidity is about 85% to 90%. Humidity-loving type: For example, cucumbers, stems and leaves are relatively thick and hard, and have a certain drought tolerance. The suitable air humidity is about 70% to 80%. Dry type: such as tomatoes, peppers, etc., single leaf area is small, the leaf surface has hairy or thick cutin, etc., more resistant to drought, suitable air humidity is about 55% to 65%. Dry-tolerant type: watermelon, melon, pumpkin, etc. The leaves are deeply cracked or tubular, and the surface is covered with thick wax powder or hairs. It has less water loss, drought resistance, and moisture resistance. The suitable air humidity is about 45% to 55%. Due to the different seasons, the space in the vegetable shed is limited, the airflow is relatively stable, the evaporation volume is large, it is not easy to convection with the outside air, and the air humidity is more difficult to adjust than the open-air vegetables. Generally, it is characterized by low humidity before and after summer, and high humidity before and after winter. When the air humidity in summer is too low, it can be supplemented by spraying and irrigation. However, when the air humidity in winter is high, improper dehumidification measures will induce diseases and reduce planting benefits. In actual production, vegetable farmers usually hang thermometers and hygrometers in the shed to monitor temperature and humidity. Many experienced vegetable farmers also judge the air humidity based on some performances in the shed, such as leaf or fruit condensation, leaf spitting, or shed. The dripping of the film, etc. When dew condensation, spitting water or dripping of the shed film is serious, the humidity should be reduced in time. Take multiple measures to adjust the humidity in the shed Ventilation and dehumidification: In summer, you can increase the top air outlet and the front face air outlet, and extend the air release time to reduce humidity. Cover moisture-absorbing organic matter: It is recommended to lay moisture-absorbing organic matter in the operation line, such as straw, rice husk, straw, etc. These organic matter can not only reduce the evaporation of ground water, but also play the role of moisture absorption and regulation of ground temperature. In summer, it prevents direct sunlight, effectively reduces the ground temperature, and can also reduce the stepping and compaction of the soil when the operating line moves back and forth. Turn these organic matter into the soil when the stubble is turned over. After decay, it can also provide organic matter to the soil, improve soil fertility, increase soil permeability, and alleviate compaction. Disclaimer: Some articles on this website are transferred from the Internet. If the legal rights of a third party are involved, please inform this website for processing. phone Yancheng Rongtai Labware Co.,Ltd , https://www.rongtailab.com