Watermelon vines grow vigorously and have strong branching power, so they must be pruned during the watermelon extension period. This can not only make the plants well ventilated, increase the light, regulate the growth of the plants, but also reduce the pests and diseases and promote the early sitting. The number of vines should be determined according to the selected variety, planting density, climatic conditions and soil fertility. There are three methods of single vine pruning, double vine pruning and three vine pruning.
Single vines have fewer female flowers. There is a limited room for selection of fruit-bearing parts. Generally, only single-crop pruning is adopted in greenhouse cultivation or planting, and other watermelon fields are rarely used.
There are two methods for double vine pruning: one is to choose a strong side vine at the base of the plant at the base of 5-8, except for the main vine. The remaining side vines on the main vine are removed, and the distance between the main vine and the side vine It is 30-40 cm. The plants with double vines have more leaves and female flowers, and the fruit setting rate is higher. The other method is that after the main vines are topped, the two strong side vines at the base of the selected plants are grown in parallel, and the remaining vines are all removed. Double vine pruning is widely used in early maturing watermelon varieties.
The so-called three-vine pruning is based on the retention of the main vine, and then the two side vines are selected, and the other side branches are immediately removed. The excess side vines are not managed so strong, and should not be removed early, otherwise it will not only consume nutrients, but also affect the growth of melons and melons.
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Ventilation is one of the most important components in a successful greenhouse.
If there is no proper ventilation, greenhouses and their growing plants can become prone to problems. The main purposes of ventilation are to regulate the temperature and humidity to the optimal level, and to ensure movement of air and thus prevent build-up of plant pathogens (such as Botrytis cinerea) that prefer still air conditions. Ventilation also ensures a supply of fresh air for photosynthesis and plant respiration, and may enable important pollinators to access the greenhouse crop.
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