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I. Variety: When selecting watermelon varieties, it is necessary to plant teratogenic varieties according to local climate conditions, such as special Daqing Hongbao, Changlong, Xinong No.8, Meiya Julong, Fufeng, Jinglongbao, etc. It is also possible to plant high round or spherical seedless watermelon varieties.
2. Pollination: In the case of insects or artificial pollination, the ovary to which the stigma of the pollen was not given corresponds to the ovary due to the lack of stimulatory stimulation. Therefore, when pollination of watermelon, artificial pollination can be used to evenly spread the pollen of male flowers on the three stigmas of female flowers, thereby reducing the formation of partial fruits.
Third, bruises: When artificial pollination of watermelon, the monks touched the peduncle or ovary of the female flower, which would damage the hair above it; or excessive force, damage the stigma of the female flower. Therefore, in the artificial pollination, the operation is light, and the hand cannot touch the pedicel and ovary of the female flower.
Fourth, pests and diseases: When the melon seedlings virus disease, disease and other viral diseases, the new leaves will shrink, twist, poor flower development, difficult to pollination and fruit set, even if the fruit can be set, but also easy to form deformed fruit. Prevention and control of watermelon plant diseases and pests, early observation, early prevention and control, try not to spray pesticides during the results of flowering pollination, reduce fruit deformation.
Fifth, water and fertilizer: In the early stage of fruit enlargement, drought and water shortage, and later watering too much will limit the expansion of melon, then it is easy to form micrantha. If you don't supply water early, you can easily grow into a "cucurbit" melon (big head). Therefore, in the fruit enlargement period, we must pay attention to timely water supply, late should control the flood, do not stop the water supply prematurely, but also increase potassium fertilizer, to promote nutrition can not be concentrated on the fruit, so as not to cause malformation.
In the production of watermelon, if there are many factors such as continuous low temperature, dryness, lack of light and high temperature, drought or rainy weather, or uneven temperature and humidity adjustment, insufficient fertilizer and water, etc., it is easy to cause fruit dysplasia. The fruit of various shapes, such as gourd, is a deformed fruit. Control methods: