Watermelon is hard to bear fruit in hot weather.

It's not the high temperature, it's the difficulty of using more nitrogen fertilizer. It's too late to spray chlormequat chloride, and the amount of nitrogen fertilizer should be controlled. For plants that have grown ineffectively, appropriate pruning and topping can be used to inhibit their vegetative growth. If the whole plant grows in vain, pruning can be taken to control its vegetative growth. On the day when watermelon blooms, 1% nongshiduo solution can be used to smear fruit stalks to promote watermelon fruit setting. It is written in the book that an apprentice can support him.