How to raise the roots of greenhouse vegetables in the high temperature "sauna" season?

As the temperature gradually increased, the weather gradually entered "sauna mode". High temperature weather is a torment for human beings, and it also brings severe tests to greenhouse vegetables. Therefore, everyone usually has the experience that over-summer vegetables are difficult to grow and the yield is low. Among the many factors that affect vegetable yield, weak root system is undoubtedly a very important reason. How to raise roots for greenhouse vegetables in high temperature season?

The factors that affect the root growth of greenhouse vegetables in high temperature seasons mainly include the following aspects:

high temperature

The suitable temperature for vegetable roots to grow is 20°C-25°C, while the soil temperature is above 30°C in many summers, especially for newly planted vegetables. If there is no shade, the temperature in the shed will be high, especially around noon on sunny days. , the soil temperature far exceeds the suitable temperature for vegetable roots, resulting in poor root growth and easy aging of yellow roots.

Soil moisture is not good

In summer, the temperature is high and the soil dries quickly, and the vegetable farmers' friends water too often or not in time during the management, which will adversely affect the root system of vegetables. Too much watering will result in poor soil aeration and roots floating on the surface. If the water is not timely, the soil is hot and dry, and the root system is damaged.

malnutrition

This happens mostly on vegetables that are in the middle and late stages of fruiting. In the high temperature season, vegetables grow quickly and consume a lot of nutrients. If the organic nutrients produced by the leaves are insufficient, the root system will be malnourished, the growth will be weak, and it will be more susceptible to disease infection.

management advice

Lower the temperature in the shed

Reduce the temperature in the shed during production.

1. Shade: including shading nets, spraying cooling agents, splashing mud, etc. When shed planting shade, we must pay attention to avoid excessive shading. The weak light environment is not conducive to vegetable photosynthesis. It can be shaded at noon, and open in the morning and evening. The shade net should not be too dense, the shade rate should be about 60%, and the cooling agent should not be sprayed too much.

2. Ventilation and cooling: Do not be too hasty when ventilating the shed during this operation, and the front and rear air vents can be equipped with insect-proof nets.

3. Water replenishment and cooling: reduce the temperature in the shed by watering and spraying water, and pay attention to controlling the water spray when the temperature in the shed is within 30 ℃. Water as early as possible.

4. Reduce ground temperature: Ground temperature directly affects the growth and activity of vegetable roots, and also indirectly affects the absorption of water and nutrients by roots. Too high ground temperature will accelerate the senescence of the root system, and it is easy to be susceptible to diseases. Under normal circumstances, the soil temperature is 5-7 °C lower than the air temperature during the day, and the upper limit of the greenhouse temperature is kept at 28-30 °C. The ground temperature is relatively suitable for root growth. Therefore, in the In summer, small water should be used frequently, soil cultivation and other methods to reduce the ground temperature and protect the root system.

5. Balance the moisture in the shed

In order to cultivate a strong root system in the high temperature season, the soil moisture and air humidity should be combined with each other, so as to achieve "dry ground and dry air". On the one hand, soil moisture should be "dry and wet" to ensure that there is sufficient moisture and air in the soil. On the other hand, keeping the air in the shed moist, which not only reduces the temperature in the shed and reduces the occurrence of sunburn, but also reduces the occurrence of viral diseases.

The above is an introduction to the reasons and measures for rooting vegetables in greenhouses in summer. In general, it is very important to raise roots in summer. Farmers and friends must pay attention to it, and take measures to prevent high temperature in summer while raising roots, so as to effectively ensure the healthy growth of greenhouse vegetables.