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The Causes and Countermeasures of Umbrella Facilitating Melon in Early Spring
In early spring, the summer squash is cultivated, and it is easy to appear that the fruit enlargement stops halfway, yellowing, and wilting. In the end, it is dry, and this symptom may appear before and after flowering. It is commonly called melon. The following are the main reasons for causing melons: (1) In early spring cultivation, the leaf assimilation function declines, and the photosynthetic accumulation of plants is less. (2) Since squash are cross-pollinated vegetables, pollen development is poor under low temperature and high humidity, and pollen is not easily distributed. Female flowers cannot receive fertilized pollen and cause melon. (3) Cultivation of greenhouses in early spring is affected by short-day low-temperature sunlight, which causes squash to open more female flowers and less male flowers, resulting in poor pollination and melon production. Some varieties of pollen undergrowth at low temperatures can also cause melons. Control methods: First of all, to cultivate robust plants and promote the growth and development of plants; Second, to control the night temperature, to prevent the night temperature is too high, in order to reduce respiratory consumption; At the same time, before the application of carbon dioxide gas ventilation, promote assimilation; Is the use of artificial pollination or hormone treatment. Artificial pollination should be carried out before 9:00 a.m. on sunny days. The male flowers that are in full bloom in the day should be taken off and the petals removed. The entire stamens should be placed directly on the stigma of the male flowers for artificial pollination. Or use 20-40 mg/L of 2,4-D to coat the fruit stalk and spray with 80-150 mg/L gibberellin, which also has good flowering and fruit protection.