After the temperature drops, what adjustments should be made to the management of vegetables in the shed?

1. Widen the temperature difference between day and night to promote the accumulation of nutrients

In order to maintain a balance between vegetative growth and reproductive growth, temperature regulation is the first. Especially for the vegetables in the early fruit stage, the berries are not fully grown, and the appropriate temperature should be maintained to promote the accelerated growth of nutrients.

At the same time, it is necessary to widen the temperature difference between day and night, promote the accumulation of organic nutrients, and improve vegetable production. The supply of organic nutrients of vegetables is mainly carried out by leaves. The daytime temperature is 25-28 ℃, which is most suitable for light action, the photosynthetic rate is the highest, and the organic nutrients produced are the most. Respiration is another major factor affecting the accumulation of nutrients, and attention should be paid to reducing night temperature and reducing respiratory consumption to promote the accumulation of nutrients. It is necessary to make good use of facilities and environmental conditions to widen the temperature difference between day and night and promote the accumulation of nutrients. Generally, the temperature of the shed should be controlled at 30 ° C during the day, and the night temperature should be controlled at about 15 ° C.

2. Prevent fruit chapping early

With the decrease of temperature, the humidity in the shed increases, and the crack phenomenon of greenhouse vegetables also enters a high incidence period. Chapping is particularly prominent on prickly cucumbers, tomatoes and bell peppers. The root cause of vegetable chapping is that the growth rate inside the fruit is not synchronized with the growth rate of the peel, and there are many direct reasons, such as improper ventilation, drastic changes in temperature and humidity, drug damage, lack of boron elements. Remind vegetable farmers to take precautions early.

① Reasonable ventilation, avoid letting out too much or too fast. After the weather turns cool in October, the temperature difference between day and night in the shed is very large, the daytime temperature is as high as 30℃, while the night temperature can drop to about 15℃, the relative humidity is very large, and dew is easy to appear on the fruit surface and leaves. In the case of more dew on the fruit surface, if the morning is suddenly released, the water on the fruit surface evaporates quickly, and the drastic change in dry humidity will lead to cracks or even cracked fruit on the fruit surface. Therefore, it must be timely to let loose. When the temperature reaches 27℃-28℃ in the morning, the dew on the fruit surface is subsided and then ventilated, which is conducive to reducing the cracked fruit.

② Pick leaves in time to reduce dew on the fruit surface. Timely removal of the leaves around the fruit can reduce the flow of dew on the leaves to the fruit surface, but also increase the ventilation of the lower part of the plant and reduce the occurrence of diseases.

③ Water reasonably. When the lower fruits are about to be harvested, the upper fruits of the plant are in the fruiting or expanding stage, and adequate water and fertilizer supply is still needed to increase the yield. After the vegetables enter the swelling period, according to the soil moisture content of the shed, timely fertilizer watering, "small water watering", try to avoid uneven drought and flood, to prevent the occurrence of cracked fruit.

④ Grasp the spraying time and concentration. Pay attention to spray disease prevention at the same time, should also pay attention to grasp the precise concentration and time. If the temperature is too high when spraying, the liquid volatilizes quickly, the concentration of residual drops on the fruit surface will rapidly increase, which is easy to cause peel cracking.

⑤ Install an air baffle in the shed. To prevent the outside cold air into the shed directly blow the fruit, to avoid drastic changes in the temperature inside the shed. The greenhouse windscreen is installed under the top vent, and the air regulating film of the arch shed is not only set at the top vent, but also needs to be set at both sides of the vent.

3. Check and debug the insulation facilities early

As the temperature drops, greenhouse insulation facilities begin to play a role. In order to properly debug the insulation facilities in advance, we should focus on the installation and debugging of the rolling machine and the insulation quilt and the inspection of the shed film in the front of the greenhouse. Heat preservation is good, the key is to constantly debug, only to adjust it to the proper position, will not produce deviation, film pressure, bending situation. After the insulation is laid, the upper and lower ends should be fixed firmly. If the pole roller is used, it is also necessary to adjust the pole Angle in time to prevent the head from "arching" the shed, resulting in the front face of the shed film damage. Repair the broken shed film in time.