First, encountered unusual weather conditions. Watermelon flowering and fruit setting, the occurrence of high temperature, low temperature, rain, drought and other adverse weather conditions will lead to abnormal growth of watermelon plants, plant growth appears weakness, watermelon ovary incomplete or thin, especially continuous rainy weather will make watermelon not normal Pollination and fertilization result in serious imbalance of vegetative growth and reproductive growth, plant growth, excessive nutrient growth, resulting in a large number of young fruit mellow phenomenon, leading to the occurrence of watermelon hard, sitting late, serious fruit and more serious consequences.
Second, improper fertilizer and water management, nitrogen fertilizer is too large. If improper management of long-term fertilizer and water will cause malnutrition of the plants, stems and leaves will grow in length, resulting in falling flowers or melons. In particular, when the amount of nitrogen fertilizer is too large and phosphorus and potassium are insufficient, it is very easy for the plants to reduce their rate of sitting.
Third, watermelon flower pollination female flower pollination is poor. During the flowering period, if the temperature is low, it is not conducive to insect activity, which affects the pollination of insects and will reduce the fruit setting rate. Such melon fields should be artificially pollinated. If the female flower pollination is uneven, it will cause problems of low fruit setting rate and fruit deformity.
Fourth, lack of understanding of the characteristics of varieties, failed to achieve good breeding methods. The understanding of the characteristics of watermelon varieties is not enough, and cultivation management cannot be carried out according to the characteristics of the varieties. In particular, the measures for control of fertilizer and water and assisted artificial pollination in the flowering and fruit setting stage of the large-fruit type watermelon are not well established, and the watermelon seed quality is not achieved. Nothing to do.
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