During the growing period of shed vegetables, high temperature affects geometry High temperatures can directly lead to sunburn. Under high light and high temperature, the transpiration of the plants is large, especially the leaves and fruits. Under direct sunlight, the temperature of the leaves and fruit surfaces is high. If the water supply is not timely, it will directly lead to burning of the melon leafy vegetables. , that is, the leaves turn green and turn white, and then it turns yellow. For the solanaceous vegetables, the leaf margins will shrink and die. On the surface of the fruit, the phenomenon of sunburn will appear directly, that is, the sunny side will appear yellow-white. Severe dry white skin. High temperatures exacerbate respiration and consume large amounts of nutrients, leading to reduced yields. High temperature not only inhibits the persistence of photosynthesis, reduces the synthesis of organic nutrients, but also accelerates the respiration. The decomposition consumes a large amount of organic nutrients, and eventually the flower buds, young fruits, etc. do not receive sufficient nutrition to become deformed, empty, or even fall off. At the same time, high temperatures affect the formation of pigments, which is not conducive to fruit color conversion. Fruits of Solanaceous vegetables can be rapidly generated at about 24°C during the color change period. If the temperature exceeds 30°C and reaches 35°C or above, the production of lycopene will be severely hindered, and yellowish-white symptoms will appear. Scientific and reasonable shade, how to properly measure The shading net has a good shading and cooling effect, shading coverage of the entire shed can reduce the heat storage capacity of the booth during the day, so that the entire greenhouse is under the optimum environmental conditions of temperature and humidity and day and night temperature difference. In general, when the temperature in the booth is longer than 35°C for a long period of time, a shade net must be installed. At present, the shade nets used by vegetable farmers are roughly divided into two categories: black shading nets and white or silver shading nets. The shading and cooling effect of the black shading net is better than that of the white shading net, but the disadvantage is that it needs to be pulled every day, and it is not possible to cover the shading net throughout the day so as to avoid the formation of a weak light environment in the shading, resulting in insufficient photosynthesis and when the flowering result is black. The shade net is only used when the sunshine is strongest at noon on sunny days. It is time-consuming and labor-intensive to use. The effect of white or silver shading nets is not as good as that of black shading nets, but it is more convenient and can be covered all day. Managing high temperature vegetables, how to prevent them Prevention of apprentices must first pay attention to increase the temperature difference between day and night; next, the amount of nitrogen fertilizer application should not be too large, try to increase the amount of phosphorus and potassium fertilizers, promote plant set fruit. If necessary, tomato, bell pepper, spray more than 3000 times or 750 times the control of auxin, 750 times the control of the melons and vegetables can be sprayed with 750 times the strong or strong CK inhibitor 1500 times. Anti-high temperature barriers enter the month of May. The temperature is high and the light is strong. Vegetables are prone to sunburn and other high-temperature disorders. It is suggested that in the recent vegetable management, picking up leafhoppers should not be excessive. In addition to anti-high temperature, but also timely foliar spray of boron and calcium fertilizers, in order to promote flowering fruit set, anti-umbilical rot and other physiological diseases. After the temperature of hormone poisoning is raised, when the vegetables are used for flowering or picking melons, the concentration of the anthers should be reduced accordingly, and the principle of using the hormone concentration limit at high temperatures should be followed. If vegetable hormone poisoning is detected, alizarin lactone (Yunda 120) can be sprayed, love more than 6000 times or nucleotides (green wind 95) 400 times to ease.
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In the spring and summer, the management of high temperature shed vegetables was busy.
The pace in the spring is getting far behind, and the smell in summer is getting more and more concentrated. At present, with the advent of the high temperature season, greenhouse vegetables have to undergo a baptism of extreme heat. At this time, the temperature in the greenhouse will often exceed 30°C. If the ventilation is poor, the temperature in the shed may be as high as 35°C or more. Such high temperatures can cause problems such as falling flowers, falling fruit, yellow leaves, and premature aging. Therefore, it is very important to grasp the management of shed vegetables during the high temperature period. A scientific and reasonable countermeasure is the key to ensuring the increase in yield and efficiency of shed vegetables.