1, ensuring natural ventilation. In order to avoid the influence of high temperature on vegetables in the shed, it is necessary to open all the upper and lower air outlets in the shed, so that cold air outside the shed can enter the shed and form convection with hot air in the shed, thus accelerating the discharge of hot air and reducing the temperature in the shed.

2. Use a sunshade net to cool down. Shading can block out too much sunlight, protect crops from strong light and create suitable growth conditions for crops. At present, it is necessary to pay attention not to cover the black sunshade net all day to avoid forming a weak light environment in the shed, which is not conducive to the growth of vegetables. Black sunshade should be used between 10 and 14. When setting the sunshade net, the sunshade net can be propped up, leaving a gap with the shed film to form a ventilation belt, which will have better sunshade and cooling effect, but be careful not to block the air outlet when putting down the sunshade net. When purchasing a sunshade net, choose one with a sunshade rate of about 60%. This sunshade net can not only shade the sun and cool down, but also irradiate some optical fibers inside the greenhouse, which is very helpful for photosynthesis of vegetable leaves.

3, timely spraying. At noon in summer, the temperature in the shed is high, and the water evaporation of leaves is large, so the water absorbed by roots can not meet the needs of vegetable water evaporation, which makes vegetable leaves roll up. Sprayers can be installed in the shed to reduce the temperature of the shed, and also increase the air humidity in the shed to prevent the style and stigma of vegetables from drying, promote pollination, and prevent vegetables from falling flowers and fruits.

4, facilities insect net. Some growers are only used to installing insect nets on the front of the shed or on both sides of the arched shed, but they often ignore the top tuyere, which provides convenient conditions for the invasion of pests. In this case, it is very conducive to the spread of viral diseases by toxic pests, and it will also lead to a large number of aphids, resulting in a reduction in vegetable production and a great discount on quality.

5. Avoid excessive water control and sparse leaves. The high temperature in summer increases the evaporation in greenhouse, which leads to the increase of allowable water content of crops. But too much watering will affect the growth of crops. It is suggested to use small amount of water and frequent watering to ensure the normal growth of vegetables. The time and frequency of watering can be determined according to the wet and dry conditions of the soil and the weather conditions in the greenhouse.