I. Planting density Watermelon planted in a solar greenhouse is generally a yellow-leaf gift watermelon and a seedless watermelon. Its planting density must be determined according to the maturity of the variety, the number of mangoes per plant and soil fertility. Premature varieties were 1500-1800 strains per mu (double vine pruning), 1500 medium-maturing varieties, and 1200 late-maturing varieties.
Second, temperature management According to the different growth and development of watermelon, the need for temperature control. The daytime temperature is generally controlled at 30°C to 36°C, and the night temperature must not be lower than 15°C. During fruit setting and fruit development, the night temperature should not be lower than 18°C. Ground temperature should be maintained above 18 °C.
III. Water and Fertilizer Management The suitable soil moisture for watermelons is 65%-78% of the maximum water holding capacity in the field. Dry soils can occur when the soil moisture is lower than 48%. The requirements of soil moisture for watermelon are high germination period, few seedling period and appropriate extension period. The result is that the middle period is the peak period of water demand, and it is necessary to fully irrigate the water. In the later stage, irrigation should be reduced.
The fertilization of watermelon should be based on the application of base fertilizer, top dressing, in the expansion of the fruit per kilogram of potassium sulfate 3O kg, diammonium 30 kg. Before and after the melon “setâ€, the mixture of 0.2% urea and 0.2% potassium dihydrogen phosphate can be sprayed on the condition. Observing whether the watermelon lacks fertilizer depends on the color of the leaves. If the base leaves are dark green, the middle leaves are green, and the top leaves are light green, indicating that the growth is normal; if the whole plant is yellow-green from the top to the bottom, it indicates lack of fertilizer; if the leaves color It is dark green from top to bottom, indicating that excessive nitrogenous fertilizer can cause madness and need attention.
4. Pruning Sunlight Greenhouse Watermelon adopts double vine pruning. The main vine spreads its fruit and climbs to grow. The auxiliary vine grows as a nutrition vine. When the vine grows 50-60 centimeters, it begins to prune, and the lateral branches before sitting in the melon section should be removed in time. For the weaker varieties, more vines or not pruning can be left.
Fifth, the parts of fruit setting and pollination that retain melon have a direct effect on the size and yield of fruit. The main cultivars should be chosen to stay on the second and third female flowers to keep the melons. When the fruit grows to the size of the eggs, the fruit can be selected. The ovary is hypertrophied, the melons are normal, and the fresh and shiny baby is selected. The rest is eliminated. Due to the low activity of insects in the solar greenhouse, artificial pollination is required to ensure fruit setting. After 9:00 in the morning, female flowers are opened and artificial pollination is performed when the male flower is loose powder. In order to make the yellow skin watermelon evenly, the yellow skin is the same, and it should start to turn melon about 20 days after flowering, so that the bottom melon skin is bright and beautiful. Fold melons when the sun goes west.
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