It is hot and rainy in summer, how to manage vegetable greenhouses?

In the summer, the weather is sometimes hot and sometimes showery, and the management of the greenhouse is also busy. High temperature can easily lead to poor growth of vegetables, high temperature obstacles, and seriously reduce planting benefits. Rainfall is conducive to the occurrence of diseases and affects the growth of vegetables. Therefore, summer greenhouse management has become the most concerned issue for vegetable farmers!

Take precautions against rainstorms

1. Before the rainstorm comes, pay attention to check the facilities of the shed. For example, whether the ventilation openings are tightly closed, whether the shed film is broken, whether the drainage channel in front of the shed is unblocked, etc., make preparations in time to prevent the shed from being flooded by heavy rainfall.

2. Drain the water in time after the shed is flooded. After the rainstorm, if water enters the shed, it is recommended to rinse it with clean water (without any fertilizer) in time after drainage to provide sufficient oxygen for the root system, reduce root rotting, heat generation and dead tree phenomenon, that is, "waterlogged garden". If there is more muddy water on the plant, it is recommended to use a sprayer to clean it. In the future management, it should be managed normally, and fertilizer should be applied. If the greenhouse to be planted after the application of the base fertilizer is flooded, the fertilizer will be lost. It is recommended to re-apply the base fertilizer and dig the soil deeply to ensure the normal growth of vegetables.

Third, strengthen the maintenance of roots and leaves. After the rainstorm, high temperature and strong light are very likely to occur. The greatest impact of high temperature on vegetables is due to the strong transpiration of leaves. If the root system is not developed enough, the water absorbed by the root system from the soil cannot meet the needs of plant evaporation, and the nutrient supply is insufficient. It will cause the leaves of vegetable plants to curl and fall off, resulting in an increase in deformed fruits, a decline in quality, and even premature aging and withering.

High temperature days bring "fire" to the greenhouse

Shading nets should pay attention to the coverage time. Shading nets have good shading and cooling effects. When the temperature in the shed is above 35 °C for a long time, shading nets should be installed. At present, the shading nets used by vegetable farmers are roughly divided into two categories, one is black shading nets, and the other is white or silver shading nets. Although the effect of the white shade net is not as good as that of the black shade net, it is more convenient and can be covered all day. The black shading net should only be used on a sunny day when the sunlight is the strongest at noon, and its specific use time can be around 10:30 am to 2:30 pm. When setting the shading net, the shading net can be propped up, leaving a gap of about 20 cm from the shed film, so that after forming a ventilation belt, the effect of shading and cooling is better.

Splashing mud to prevent rain erosion Splashing mud is a soil method, and it does not cost money. Although the effect is not as good as the sunshade net, it can also reduce the temperature in the shed. When the light is strong, splash more, and when it is not strong, splash less. But splashing mud also has drawbacks, it is easy to spray unevenly, and it is easy to be washed away after rain. If the spray is too thick, it is equivalent to covering the sunshade net all day, and it is easy to cause low light hazards for a long time. In order to prevent the mud from being washed away by rain, some vegetable farmers have greatly improved its erosion resistance by adding a certain amount of flour to the mud.

Guarantee the golden period of vegetables

The temperature in summer is hot and the light time is sufficient. In addition to this year's rain, it is the golden period for the growth of vegetables, and it is also the golden period for the breeding of weeds and microbial pests. In order to ensure the golden period of vegetables, eliminate the growth of weeds and curb microbial pests Growing, vegetable farmers need to pay attention to the following aspects: First, after the rainy day, the water in the vegetable garden should be drained in time, the land should be ploughed in time, the evaporation of excess water in the soil should be strengthened, and the air flow in the soil should be strengthened. Avoid causing vegetable root rot and death. Second, for green vegetables, timely remove the rotten leaves at the bottom, the spent leaves and the dry leaves, so as to prevent the disease and insect microorganisms produced by the leaves from affecting the growth of the vegetables. At the same time, vegetable farmers need to speed up the harvest of mature vegetables. Rain and cooling in dog days have both advantages and disadvantages for vegetables. As long as vegetable farmers make reasonable use of them, stable and high yields of vegetables are inevitable.