Harm to vegetables caused by high temperature in summer
The normal development of all kinds of fruits and vegetables requires an optimal temperature environment. Excessive temperature will cause problems such as poor root growth and absorption, weak yellow seedlings, and prosperous seedlings. In addition, different types of fruits and vegetables have certain differences in high temperature and low temperature tolerance. If the temperature during growth exceeds the maximum or minimum temperature, physiological growth obstacles will occur, and dead trees will occur in severe cases.
In terms of high-temperature growth obstacles caused by high-temperature environments, when the indoor temperature of the shed in summer is in a high-temperature environment of 35°C to 40°C for a long time, the seeds of fruits and vegetables will have difficulty or no germination after sowing. Seedlings will have long stems and leaves, yellow seedlings weak and early bolting. When fruits and vegetables are exposed to unprotected high temperature and high light environment of 40°C and above for a long time, it will lead to rapid death of the injured fruits and vegetables in severe cases.
Methods to alleviate high temperature physiological obstacles in vegetables
The germination should be under low temperature before sowing
For melons, fruits and vegetables grown in summer and autumn, after some seeds are sown in the high temperature weather environment of 35℃～38℃ and above in summer, the seeds in the soil may be difficult to germinate, difficult to emerge, and uneven emergence. Therefore, it is recommended that vegetable farmers conduct low-temperature germination treatment on the seeds before sowing, and then sowing.
Choose heat-tolerant varieties and interplant them reasonably
It is recommended that vegetable growers choose early-maturing varieties with strong heat resistance and high temperature resistance. At the same time, when planting low fruit and vegetables in the early stage, try to interplant them with tall crops or shelves of fruit and vegetables.
Field mulching to prevent soil high temperature
For melons, fruits and vegetables grown in open fields in summer, vegetable farmers can cover the bare ground in the field with crushed straws, straws, etc. This can prevent soil high temperature from harming crop roots, improve soil water retention, and reduce surface soil moisture loss by evaporation the amount.
Strengthen water and fertilizer supply and ventilation management
In terms of water and fertilizer management, no matter what kind of fruits and vegetables are planted, watering and topdressing should be carried out in a timely, timely and reasonable manner according to the actual growth of the seedlings, different growth stages, and weather and precipitation conditions.
When ventilating in hot weather in summer, pay attention to opening both the upper and lower air vents, but pay attention to adding a windshield at the lower air vent to prevent the external cold wind from blowing directly on the leaves or fruit surfaces of the fruits and vegetables Induces rapid wilting of leaves or cracking of young fruits.
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