The influence of high temperature weather on vegetables in autumn and how to manage and fertilize vegetables in high temperature weather.

Excessive water control has become like high temperature and drought. In the shed at noon, plants wither due to physiological water shortage, which is not only not conducive to the normal growth of vegetables, but also easy to affect the absorption of trace elements by plants due to soil drought, such as umbilical rot caused by calcium deficiency, and it is also easy to cause viral diseases. It is suggested to use small amount of irrigation. In order to ensure the water needed for the normal growth of vegetables, the time and frequency of watering in the shed should be determined according to the dry and wet conditions of the soil and the weather conditions, and fertilization should be carried out.

The training of leaves must be moderate, following the principle that there are many fruits in the upper leaves without crowding, and the fruits in the lower leaves are "few and thin". Fruits can ensure the normal growth of photosynthesis of leaves, and the fruits on the upper leaves are shaded to avoid direct glare caused by excessive picking of fruits on leaves and reduce fruit quality. In summer, migratory insects, such as whiteflies and aphids, begin to move into the shed, especially those adjacent to field crops, which are more vulnerable to pests. In the past, some vegetable farmers only set insect nets in front of the shed or on both sides of the arched shed, but did not set insect nets at the top air outlet in time, which provided convenient conditions for pests to invade. After pests enter the greenhouse, they spread virus diseases, causing a large number of coal pollution diseases and reducing the yield and quality of vegetables. Therefore, it is necessary to set an insect net at the top air outlet.

When the temperature in the shed exceeds 35℃, try to reduce the temperature in the shed. On the premise of increasing ventilation, measures can be taken to solve this problem, such as setting up a sunshade net, covering crop straw in the production line and watering frequently. Set a sunshade net on the roof to cool down, and pay attention to the time covered by the sunshade net from 1 1 to 2 pm, so as to avoid covering all day, so as not to affect the normal photosynthesis of vegetables. The basic principles are: cover in sunny days, not in rainy days; Cover at noon, sooner or later. According to the planting situation of different crops, the use of sunshade nets is also different.

If tomatoes like light, the covering time should be about 4 hours around noon; Sweet pepper is resistant to light and weak light. If it coincides with the autumn tiger attacking the high temperature season, the coverage time can be extended. Cover the rows with crop straw. Some vegetable farmers have added air vents and set up sunshade nets, but sometimes they still can't reduce the temperature in the shed. It is suggested that vegetable farmers cover vegetable production lines with crop straws, which can not only avoid the rapid rise of ground temperature, but also reduce the evaporation of soil moisture and avoid the spread of weeds, bacteria and other hazards. After the vegetable rows are covered with crop straws, the ground temperature can also be reduced by 4-5℃.