Large temperature difference between day and night to prevent fruit from breaking
After entering October, a series of vegetable problems will follow one after another, such as cucumber gum and tomato cracking. The emergence of these problems is mainly caused by the excessive temperature difference between day and night in the shed and the drastic changes in the dry humidity and the failure to adjust the shed management measures in time. Some vegetable farmers will ask, hasn't it been advocated to "widen the temperature difference for high yield"? Now is the good time, why is it not working? Temperature difference refers to the appropriate temperature difference, about 10 degrees Celsius to 15 degrees Celsius, more than 15 degrees Celsius will affect the normal growth of vegetables. Take cucumber as an example. When the temperature difference between day and night exceeds 20 degrees Celsius, the accumulation of organic nutrients increases, and the growth of the flesh is fast, but the growth of the skin is slow, and the skin is broken, forming some small cracks and flowing out of rubber particles.
Therefore, vegetable farmers should do the following 4 points in time according to weather changes.
1. Reasonable ventilation and control the temperature difference between day and night.
Do not ventilate before and after day and night. At night, you need to close the air vent properly or pull a small air vent to avoid low night temperature, resulting in excessive temperature difference between day and night. At present, the relative humidity in the shed is very high, and the fruit surface and leaves are prone to condensation. In addition, there are more windy weather in autumn. If there is more dew on the fruit surface, if the wind is suddenly released in the morning, the fruit surface moisture will evaporate quickly and the dry humidity will change too quickly, which will cause the fruit surface to crack or even crack the fruit. Therefore, it is possible to take early release and gradually increase the volume of air to prevent it during the day.
2. Water to flush fertilizer at the right time to control the humidity in the shed.
According to the soil moisture in the shed, it is necessary to topdress and water in time to ensure that it is not too dry or wet, not too much water and too much fertilizer, "small water and frequent watering" is better, and try to avoid uneven droughts and floods to prevent the occurrence of cracking. Watering and fertilizing can be selected in the sunny morning, and the wind can be released in time to avoid high temperature and humidity in the shed and prevent the occurrence of diseases. In the fruiting period, the main fertilizer is high-potassium water-soluble fertilizer. In order to avoid premature aging of yellow leaves, the nitrogen-phosphorus-potassium balanced water-soluble fertilizer is flushed with two water intervals. If the plant growth is weak, it can be combined with chitin, amino acid and other root fertilizers to restore the plant growth as soon as possible.
3. Pay attention to the concentration and timing of spraying to prevent disease.
In autumn, while spraying to prevent disease, you should also pay attention to the concentration and time. If the temperature is too high when spraying or the spraying time is scheduled at noon, the liquid will evaporate quickly, and the concentration of droplets remaining on the fruit surface will increase rapidly, and the peel is easy to crack, resulting in cracked fruit. Therefore, spraying can be done in the morning after the fruit noodles are dew, try to avoid spraying at noon high temperature.
4. Add boron and calcium fertilizers to the leaves to enhance the crack resistance of the fruit.
As the temperature difference between day and night increases, tomatoes, cucumbers and other vegetables are prone to cracking. It is recommended to spray foliar fertilizers containing trace elements such as boron and calcium regularly to increase the toughness of the fruit cell wall and prevent fruit cracking or cracking.
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