As the temperature rises, the growth of watermelon plants is accelerated, from vegetative growth to reproduction-based growth, which is also a key stage for the growth of watermelon. In production management, we must focus on the following aspects of work.
First, artificial pollination, improve the quality of watermelon
For the watermelon field that has not been established yet, it is necessary to continue the artificial pollination work and improve the quality of the commodity melon. When pollination should choose the main ranch second or third female flower, pollination time in the morning at 7 to 9 hours, rainy weather, male pollen powder late, can be delayed pollination time. After pollination, it is best to make a mark in order to accurately determine the ripening date of watermelon and facilitate harvesting. For the first batch of melons whose enlargement has ended and the plant growth is still good, the second batch of melons can be selected for the larger melon embryos.
Second, sparse melons, improve the fruit
When the normal development of watermelon fruit grows to the size of the egg, it indicates that the melon has settled. At this time, artificial fruit thinning is needed to ensure the quality of the commodity melon. Sparse disease fruit, fruit cracking, malformed fruit, and excessive young fruit, ensuring 1 fruit in the middle-fruit watermelon, and 1 to 2 fruits in the small-fruit watermelon.
Third, scientific fertilization, promote the expansion of young fruit
For swollen watermelons, apply swollen manure. It is recommended that watermelons cultivated in spring should be applied with 20-25 kg of compound fertilizer per acre and 100 times of water to be applied through a dropper, and the seedlings should be treated in one or two times depending on the growth of melon seedlings. Conditional application of 5-10 kg of sulfuric acid per acre is recommended. Potassium. The specific amount of fertilizer should also be increased or decreased according to the amount of basal fertilizer, the difference in soil fertility, and the growth of plants.
Fourth, control the greenhouse temperature and create a suitable growth environment
For watermelons with fruit enlargement period, the temperature of the greenhouse can be appropriately increased to promote fruit enlargement. Daytime temperature can be controlled at 30 °C ~ 35 °C, 18 °C ~ 20 °C at night. During the first half of maturity, the temperature difference between day and night should be greater than 10°C to facilitate the accumulation of sugar and the improvement of fruit quality.
V. Clean up the ditch and improve the resistance of the plants
As the temperature rises, the amount of rainwater will gradually increase. Therefore, the Daminggou inside and outside the field and out of the water should be regularly cleared to prevent clogging. Too shallow should be deepened to ensure smooth drainage and promote healthy growth of plants.
Sixth, to strengthen integrated pest management
April is the season of watermelon pests and diseases. It mainly includes wilt disease, blight, downy mildew, powdery mildew, bacterial keratopathies, locusts, etc. The principle of prevention and comprehensive prevention and control should be implemented to control the temperature in the shed. Humidity, improve plant disease resistance, once the pests and diseases found, it is necessary to control the use of drugs in a timely manner, while paying attention to the safe interval of application.
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