What problems should be paid attention to in greenhouse vegetable planting in high temperature weather?

First, avoid the problem of high temperature and low illumination. In summer, the outdoor temperature is often higher than 35℃, and the indoor temperature will rise above 40℃. The most effective cooling method is to use sunshade net to cool down. In addition, shading should be reasonable, too much shading will easily affect pollination, and it should be flexibly mastered according to the weather conditions and the requirements of light intensity and temperature at different growth stages. Generally covered in sunny days, not covered in cloudy days; Cover at noon and uncover in the morning and evening; Cover in the early stage and uncover in the later stage of growth. If it is rainy and the temperature is not too high, it is not necessary to cover it all day, but it must be covered in time for a long time in order to avoid injury.

Secondly, avoid partial application of nitrogen fertilizer. Manure is the main base fertilizer, and the content of nitrogen fertilizer is the highest, while the content of phosphorus and potassium fertilizer is low. The excessive application of manure makes the nitrogen nutrition in the soil surplus before and after planting, or the application of nitrogen-containing substances after planting leads to excessive vegetative growth of plants and affects reproductive growth.

Finally, avoid watering too often. Eggplant vegetables, such as peppers, should not be watered too often after planting. Usually, after the first watering, water the seedlings for the second time every five days or so. After that, it is not allowed to water more until the first ear or fruit is set. Water control is the main method, and amino acids, chitin and alginic acid products can be combined with slow seedling water to improve plant stress resistance.