Watermelon is a cross-pollinated crop. Under natural conditions, insects spread pollen. Early female flowers are exposed to lower temperature conditions, and insect activity is less, which affects pollination and fruiting. Artificial assistant pollination can significantly improve the rate of results. The method of pollination is to open the male flower buds that can be opened on the same day when the female flowers in the ideal fruit setting are open, and put them in a small box to make them open naturally. When the female flowers are open in the field, the male flowers are also open, peeling off the male flower corolla and spreading the twisted anthers on the On the stigma of the pistil. Each male flower can be pollinated with 2 to 3 female flowers. When pollinating, care should be taken not to damage the ovary, so as not to affect the results. The pollination time should be early, because the amount of pollen of the newly opened female flower is large, the viability is strong, and the result rate is high. After 10 o'clock, the stigma secretes mucus, which affects the pollination result. The success rate of artificially assisted pollination is related to the climatic conditions at that time and the quality of the ovary. The pollination rate on sunny days is as high as 83%, and the cloudy rate is only 30%. The female flower buds are well developed, showing that the flower stalk is thicker, the ovary is large, the shape is normal, the color is bright green and lustrous, and the ovary is densely bred, which is easy to set fruit after artificially assisted pollination. The female flower handle is thin, and the ovary is small and thin, and the fruit setting rate is low. When the temperature rises, the watermelon flower is developing normally, the insect activity is frequent, the natural fruit setting rate is high, artificially assisted pollination is not necessary, and when low temperature, rainy or plant growth is strong, artificial assisted pollination should be used.
Rainy day sets of rainproof bags and paper bags also have a certain effect. The method is to use a small paper tube to prevent rain before the opening of the female flowers in the morning. At the same time, the male flower buds are removed and stored indoors. The female flowers in the field are open at the same time, and the rain bag is pollinated, and then put on. The paper tube is rainproof. After 4 to 5 hours of pollination, there is no rainstorm to wash off the rainproof bag. Some female flowers can produce results.
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