Spring awning awning watermelon generally adopts multi-membrane coverage. As the temperature rises, the shed film has gradually changed from three layers to two layers. Many melon farmers are accustomed to seeing only one-time ventilation. In fact, there are many drawbacks in doing so. Disposable ventilation tends to change the temperature and humidity in the shed quickly, which can easily lead to “flash seedlingsâ€. The leaves of the lighter leaves are green and dry, and the entire leaves are dry. In case of high humidity, bacteria can easily be induced. Disease.
The correct approach should be based on the growth of watermelon stems determine the timing of ventilation. If the stem vines grow too profusely, ventilation should be advanced in advance. Otherwise, the delay can be appropriately delayed. However, the temperature in the shed cannot exceed 35°C.
Close the vents are also quite particular, one is the time to close the vents, in general, the south wind is warm, the north wind is cool, so the ventilation time can be extended appropriately when blowing the south wind. The second is to close the vents in batches. When the temperature in the booth is lower than 22°C, close the vents on the outermost film. When the temperature continues to drop below 19°C, close the vents on the two membranes. Finally, cover all the planting arches.
This ventilation is not only effective in cultivating robust plants, but also conducive to the transformation of watermelon from vegetative growth to reproductive growth. There are many male flowers, and the amount of pollen per plant is also large. When the watermelon is pollinated, the cucurbits are relatively coarse and can be significantly increased after pollination. Sitting on melon rate.
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