What are the high-yield techniques of vegetables in greenhouse in summer? It is very important to do these five points well!

The high temperature in summer promotes the increase of diseases and insect pests, and the growth of vegetables will be restricted to a certain extent. at this time, in order to ensure the yield of vegetables, we should learn to use some seed skills. What are the high-yield techniques of greenhouse vegetables in summer? It is very important to do these five points well!

High-yield techniques of vegetables in greenhouse in summer

1. Ensure natural ventilation

In order to avoid the influence of high temperature on vegetables in the greenhouse, we should pay attention to open all the upper and lower air vents of the greenhouse, let the cold air outside the shed enter the shed, and form convection with the hot air in the shed, so as to accelerate the discharge of hot air and reduce the temperature in the greenhouse.

2. Use sunshade net to cool down.

Sunshade can block out excess sunlight, protect crops from strong light burns, and create suitable growth conditions for crops. At present, the use of black shading net should not be covered throughout the day, so as not to form a weak light environment in the shed, which is not conducive to the growth of vegetables. The black sunshade net should be used between 10:00 and 14:00. When setting the sunshade net, you can prop up the sunshade net and leave a gap with the greenhouse film to form a ventilation belt after the sunshade cooling effect is better, but be careful not to block the vents when putting the sunshade net down.

When choosing and purchasing sunshade net, the shading rate is about 60%. This kind of sunshade net can not only shade and cool down, but also illuminate part of the optical fiber inside the greenhouse, which is of great help to the photosynthesis of vegetable leaves.

3. Timely spray

At noon in summer, the temperature in the greenhouse is higher, the water evaporation of leaves is large, and the water absorbed by roots can not meet the needs of water evaporation of vegetables, which makes the leaves of vegetables appear curling phenomenon. Spray spray can be installed in the greenhouse to reduce the greenhouse temperature, which can also increase the air humidity in the greenhouse, prevent vegetable style stigma from drying, promote pollination, prevent vegetables from falling flowers and fruits, and so on.

4. Insect prevention net for facilities

Some growers are only used to setting anti-insect nets on the front face of the shed or on both sides of the arch shed, but 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 virus diseases by pests. It will also lead to a large number of aphids and other occurrence, resulting in reduced production of vegetables, quality is also greatly reduced.

5. Avoid excessive water control and leaf thinning

The high temperature in summer makes the evaporation in the greenhouse large, which leads to the increase of the allowable water content of crops, but too much watering will affect the growth of crops. It is suggested that frequent watering with small water should be adopted to ensure the normal growth of vegetables. The watering time and times can be determined according to the dry and wet soil and weather conditions in the greenhouse.

Summer is the peak period of vegetable growth, and many vegetable farmers will carry out leaf thinning in order to ensure the nutritional needs of crops, but they should pay attention to moderate leaf thinning and follow the principle of "more but not squeezed" in the upper leaves of the fruit and "less but lean and dry" in the lower leaves of the fruit, so as to avoid sunburn caused by excessive picking of leaves and reduce the quality of the fruit.

As long as the above techniques are followed in greenhouse vegetable cultivation in summer, it is easy to obtain high yield.