First, to strengthen ventilation, reduce the greenhouse vegetable farmers in the cultivation of summer vegetables, in order to avoid greenhouse diseases in the greenhouse, we must pay attention to open the upper and lower air outlet of the greenhouse, so that the cold outside the greenhouse into the shed, and the shed The hot air forms convection to accelerate the discharge of hot air, thereby facilitating the reduction of the temperature in the shed. It is necessary to remind the vegetable farmer that when the air is released, a windshield film should be installed below the air outlet to prevent the cold air from blowing directly onto the fruit surface of the vegetables, resulting in the appearance of rind and cracks in the fruit.
Second, the use of shade net cooling When the greenhouse temperature can not be controlled within the requirements of the appropriate range of vegetable growth, the best use of shade net shade cooling. The vegetable grower should put down the shade net when the temperature in the morning shed is close to the maximum temperature suitable for growing vegetables. When the temperature in the afternoon shed is lower than the maximum temperature for the growth of suitable vegetables, the shade net can be rolled up, but pay attention to put down the shade net. Can not block the outlet. In the purchase of shade nets, vegetable farmers can buy an opacity rate of about 60%, because this kind of shade net can play the role of shading and cooling, prevent sunburn fruit, and allow some of the light to reach the interior of the greenhouse. Improvement of photosynthesis in vegetable leaves.
Third, noon spray cooling at noon in the summer, because the greenhouse temperature is higher, the leaf evaporation, root water absorption can not meet the needs of vegetable transpiration, and tomato leaves appear on the roll phenomenon. The vegetable growers can install micro-spray spray in the shed to reduce the temperature of the shed. This can also increase the air humidity in the shed, prevent the stigma from drying, promote pollination, and prevent vegetables from falling.
Fourth, spray foliar fertilizer vegetable farmers can also be like the greenhouse vegetable leaves spraying chitin, amino acids, alginate and other leaf fertilizer method to promote the healthy growth of vegetables, improve its resistance to high temperature.
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