It's hot! This high temperature is rare during the same period! The vegetables in the greenhouse are cooled down, hurry up and arrange them

Since June, the temperature has risen, the rainy season is coming, and the air humidity is high, which is conducive to the occurrence of various diseases and insect pests. In order to ensure the normal growth of vegetables and increase production and income, vegetable planting friends must do a good job in the management of greenhouse vegetables in high temperature weather.

Do a good job of temperature and humidity control

◆Temperature control: When the light is strong and the temperature is high during the day, it can be properly ventilated and cooled to control the vigorous growth of the plants and enhance the resistance of the plants. The temperature in the shed can also be reduced by covering the sunshade net.

◆Humidity control: Greenhouse vegetables have a slow volatilization of moisture in the greenhouse due to the strong sealing property of the plastic film. If the humidity in the shed is too high, it is easy to aggravate the occurrence of diseases. Therefore, attention should be paid to strengthening ventilation, promoting the exchange of gas between the shed and outside the shed, and effectively reducing the relative humidity of the air in the shed. Generally, the relative humidity of the air in the shed is kept at 70─80%.

Strengthen fertilizer and water management

◆Rational fertilization: Fertilization should be combined with watering according to the different growth stages and different growth characteristics of each vegetable.

◤Adhere to scientific formula fertilization, completely change the previous trend of dinitrogenous fertilizer and light phosphorus and potassium fertilizer; generally, nitrogen fertilizer is mainly used in the early stage, and potassium fertilizer is mainly used in the middle and late stage. ◢

◤ Adhere to organic fertilizers and inorganic fertilizers (chemical fertilizers) as a supplement, which can effectively reduce the occurrence of fertilizer damage, increase soil organic matter, improve soil, promote root development, and increase vegetable yield.

◆Water management: According to the water demand law of vegetables in different growth periods and soil moisture, watering should be carried out in a timely and appropriate amount. Watering method: It is best to implement drip irrigation or hidden pipes under the membrane. Avoid flood irrigation. There is a lot of rain in summer. Pay attention to dredging the ditches so that the water in the field can be drained in time.

good plant adjustment

Plant adjustment can improve the ventilation and light transmission conditions, improve the nutritional status of vegetables, and improve the yield and quality of vegetables. Specific management measures mainly include hanging vines, pruning, topping, thinning flowers, thinning fruits, and removing diseased leaves from the lower part. When vegetable products reach commercial maturity, they should be picked and harvested in time to ensure product quality, reduce nutrient consumption, and increase yield per unit area.

Improve pest control?

In the prevention and control of pests and diseases, it is necessary to follow the principle of "prevention first, comprehensive prevention and control", implement the principle of "mainly agricultural control, physical control, biological control, supplemented by chemical control", and actively promote harmless control technology.

◆Agricultural prevention and control: Cultivate strong seedlings, adjust plant density in a timely manner, carry out pruning rationally, promote ventilation and light transmission, increase phosphorus and potassium compound fertilizers, and enhance vegetable disease resistance.

◆Biological control: Use fungi to control insects, use insects to control insects, use antibiotics to prevent and control diseases and insect pests, or use various biological agents to prevent and control diseases and insect pests, which can directly replace some chemical pesticides.