1. Temperature is uncomfortable during flowering The suitable temperature for watermelon flowering and fruit setting is 25-30 °C, and the lowest daily average temperature is 20?21 °C. Unsuitable temperature conditions will seriously affect the pollination of watermelon. When the temperature exceeds 35 °C, the function of pollen grains decreases with the increase of temperature. If the temperature is high at 40 °C for 2 hours, the germination of pollen grains and the elongation of pollen tube decrease significantly. Due to the short life of pollen grains, fertilization is caused. obstacle. This will result in more flowers, even if the results are mostly deformed. When the ovary development and flowering temperature are lower than 18 °C, most of the fruits formed are oblate, deformed, thick, hollow, and low in sugar content. 2, flowering rainy days, watermelons in the flowering period in the rainy weather, affecting normal pollination, especially in the rainy days last longer than hard to sit. The main reason is that rainy days are more than normal, the development of ovary and flower organs is affected, and the rainwater is easy to flush the pollen on the head of the female flower or the pollen rupture loses its germination ability, and it is difficult to complete the fertilization process. 3, vegetative growth and reproductive growth loss adjustment branches and vines are unreasonable, planting density is too large, vine leaves are depressed, poor ventilation and light, or plant growth is weak, poor pollination and fertilization is also the cause of falling flowers or melons. Prevent countermeasures: 1. Cut the main vines and use the side vines. When the growth of the melon field is found to be strong and the phenomenon is “longâ€, the main vines can be cut from the roots by 5-10 leaves, and the side vines are used. 2. Now that the female female buds are budded, leave 2 leaf mites in front of the melon to remove the excess side vines, so that the nutrients are concentrated to feed the female flowers. 3. Artificial pollination of watermelon is an insect-mediated flower. If insects are less affected by 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 afternoon, the female flowers and male flowers to be opened on the second day are put on plastic bags at the same time to prevent the rain from drenching the flower buds. After pollination, the plastic bags are continuously put on, and immediately removed after rain. 4, heavy pressure vines found that melon vine "crazy long" difficult to sit melon, after the melon 2 knots, the first two sections of the melon dig pit vines, reduce nutrients to the growth point, you can control the length, promote the sitting melon. When the young melon grows to the size of the bowl, the vine will be opened and the vines will be taken to the spot to prevent infection. 5, lightly squeeze the stem in the front section of the melon, gently pinch the stem, weaken the apex advantage, so that the nutrients are concentrated to supply the young melon, the so-called "front head, sitting behind." Disclaimer: Some articles on this website are transferred from the Internet. If legal rights of third parties are involved, please inform this website. phone Nebulize, Nebulize Machine,Portable Nebulizer,mesh nebulizer Shenzhen Urion Technology Co., Ltd. , https://www.urionhealth.com