1, the flowering temperature is not suitable for watermelon flowering fruiting period suitable temperature 25-30 °C, the minimum daily average temperature of 20-21 °C, unfavorable temperature conditions will seriously affect watermelon pollination and strong. When the temperature exceeds 35°C, the function of the pollen grains decreases as the temperature rises. If the high temperature of 2 hours and 40°C is encountered, the germination of the pollen grains and the elongation of the pollen tube significantly decrease. Due to the short life span of the pollen grains, the fertilization can cause fertilization. obstacle. In this way, many flowers fall, even though the results are often misshapen. When the ovary develops and the flowering temperature is below 18°C, most of the fruits formed are oblately deformed, with thick skin, hollow and low sugar content. 2. During the rainy days of flowering, the watermelon flowering period is affected by the rainy weather, which affects the normal pollination, especially when the rainy days last longer and it is more difficult to sit on melons. The main reason is that there are more rainy days than usual, and the development of the ovary and floral devices is affected. In addition, the rain can easily flush out the pollen on the female stigma or break the pollen to lose the ability to germinate, making it difficult to complete the fertilization process. 3, vegetative growth and reproductive growth loss of adjusting branches and leaving vines unreasonable, planting density is too large, vine leaf cover, poor ventilation and light transmission, or plant growth is weak, poor pollination and fertilization is also caused by falling flower or melon. Prevention measures: 1. Cut off the main vine when using side vines. When it is found that the melon field grows vigorously and shows a “leggy†phenomenon, it can leave the main vine to leave 5-10 leaves and cut it, using side vines. 2. When female buds are female buds, the leaves of the female buds are left at the top to remove the excess lateral vines, so that the nutrient is concentrated to supply the female flowers. 3. Artificially pollinated watermelons are insect-borne flowers. If the insects are less likely to affect pollination, artificial pollination is an important measure to increase the rate of sitting. Especially in rainy days, artificial pollination should be strengthened. On the first day of the afternoon, the female flowers and male flowers that were to be opened the next day were put on plastic bags to prevent the rain from seeping the buds. After the pollination, the plastic bags were put on and immediately picked off after the rain. 4, when the weight of vines found that Guaman "crazy" difficult to sit melon, in the melon after 2 sections, 2 points before the melon digging pressure vines, reduce nutrient delivery to the growth point, you can control leggy, promote sitting melon. After the baby grows to the size of the bowl, the vine will be pressed and the vines will be taken to the bright spot to prevent infection. 5, gently pinch the stem before the melon section, gently pinch the stem, weakening the advantages of the apex, so that nutrients concentrated supply of young melon, the so-called "head ahead of Kabak, sitting behind the melon.
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