Causes and control measures of watermelon and stiff melon in spring

The causes of stiff melon are as follows: 1. Excessively growing melon vines: the production of nutrient stems and leaves consume too much, can not meet the needs of fruit expansion, and show a state of crazy growth. Strong seedlings should be cultivated to lay a good foundation for normal fruit development. before and after fruit setting, the application amount and time of expanded melon fertilizer should be adjusted according to the size of new leaves, the thickness of vines, the length of internodes, and the length from the top of the vine to the node of open female flowers. If the length from the top of the vine to the node of the open female flower is more than 67 cm, it means that the melon vine is overgrowing and should be restrained; if its length is less than 50 cm, it means that the melon vine is weak and should be fertilized immediately to promote its growth; if its length is within the range of 50-67 cm, it means that the melon vine is growing normally. 2. Dry soil and lack of fertilizer and water: if there is not enough fertilizer and water in the period of fruit expansion, it is easy to form stiff fruit. Therefore, the melon land should be irrigated, and the amount of water should be irrigated from less to more. The retention time of water in the field should not be too long. It should be irrigated in the evening or at night to avoid burning roots at high temperature. In order to develop watermelon in hilly land, the water storage capacity should be increased before winter, and the method of seedling raising and transplanting should be adopted to strive for early fruit setting so as to reduce the effect of drought on fruit expansion. When the young fruit grows to the size of the egg, chase the melon fertilizer in time. 3. Lack of functional leaves: generally speaking, fruits with more leaves grow larger and of good quality, so there should be a considerable number of functional leaves for light and function in cultivation to meet the needs of fruit expansion. 4. During pollination, the amount of pollen from male flowers applied to the stigma of female flowers is insufficient, and the number of seeds has an important effect on the development of fruit. Under the same conditions, the fruit with more seeds grows bigger. Therefore, it is necessary to choose the best time to put as much viable pollen on the stigma as possible, so as to increase the number of seeds and achieve the goal of high yield. 5. the female flowers are slender and thin, and the flowers with few hairs are not easy to set fruit after pollination, even if the fruit is difficult to grow up. Therefore, female flowers with well-developed buds, large and exuberant growth should be selected for pollination. The main characteristics of high-quality female flowers are thick stalk, large ovary, normal appearance, bright green and glossy color, and dense pilose. 6. The leaves seriously damaged by diseases and insect pests can not carry out photosynthesis normally, which affects the fruit development. 7. if the fruit is too close or too far away, the expansion of the fruit will be affected by many aspects.