When interviewed in rural areas, many vegetable farmers who plant summer vegetables said that due to the high temperature in the greenhouse (the maximum temperature in the greenhouse reached 40°C at noon), the vegetables grown in the greenhouse grew poorly, such as the appearance of tomato leaves. Burning, serious flowering phenomenon, pepper is a large number of sunburn fruit and umbilical rot disease fruit, legumes are showing serious decline in falling flowers, etc., and these are due to high temperatures in the greenhouse caused by high temperature barriers. So how should the vegetable farmers reduce the temperature inside the greenhouse and prevent the occurrence of high temperature barriers in the greenhouse?
First, strengthen ventilation and reduce the temperature of the greenhouse. When vegetable growers plant vegetables in summer, in order to avoid high temperature barriers in the vegetables in the greenhouse, attention should be paid to opening all the upper and lower air outlets of the greenhouse. After the cold air outside the greenhouse enters the greenhouse, convection will occur with the hot air in the greenhouse to accelerate The hot air is discharged so as to facilitate the reduction of the temperature in the booth. 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, use shade nets to cool down. When the greenhouse temperature cannot be controlled within the required range for the growth of suitable vegetables through the ventilation method, it is better for the vegetable grower to use the shade net to cool the shade. 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.
Again, noon spray cooling. At noon of summer, due to the high temperature in the greenhouse and the large evaporation of the leaves, the water absorbed by the roots could not meet the needs of transpiration of the vegetables, and the tomato leaves appeared to be rolling up. The vegetable growers can install micro-spray spray in the shed to reduce the temperature of the shed. This can also increase the humidity in the shed, prevent the stigma from drying, promote pollination, and prevent vegetables from falling.
Finally, vegetable farmers can also spray chitin, amino acids, alginate and other foliage fertilizers on vegetable leaves in the greenhouse to promote robust vegetable growth and increase their resistance to high temperatures.
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