Watermelon "emptiness" has now become a major obstacle to the high yield of watermelon. Now the reasons and prevention measures of watermelon "vacant" are described as follows:
First, fertilizer and water rations are irrational: cause the stems and leaves to produce flowers or puppies, reduce the rate of sitting and forming "empty." Measures: Control the application amount of nitrogen fertilizer and the time of watering. The watering should be done when the melon fist is reserved. For those appetite-oriented or obstinate fields, they should be pressured to tap or mechanically pick up the leading, or even pick up the heart, supplemented by artificial pollination or hormone treatment to increase the fruit setting rate and prevent "empty defects."
Second, poor flowering environment conditions: First, flowering temperature or high temperature. The optimum temperature for the germination of watermelon pollen is 20°C-25°C. When the temperature is higher than 35°C or lower than 15°C, pollen germination or pollen tube elongation will be seriously affected, which will affect pollination and fruit setting. Second, flowering rain or watering, high humidity in the field, affecting normal pollination, at the same time, water inflow or splash into the flower caused by falling flowers and melons; measures: first flowering does not water; followed by protection of flowers before the rain, such as pollination after the set Bags, covered or buried in soil, will be released in time after the rain. The third is spraying at full bloom. Spraying the spray into the flower will affect pollination, and at the same time, it will also affect insect pollination. Measures: The flowering period is generally not suitable for spraying. If the pests and diseases are seriously in need of leaf medicines, care should be taken to protect the flower plants, after 4:00 pm.
Third, the planting density is too large: poor ventilation and light transmission, plant growth is weak, internodes, petiole slender, thin leaves, pale leaves, small ovary, easy to produce falling flowers or melons, there "empty." Measures: Proper density planting, according to the characteristics of the varieties and the conditions of the soil, it is not suitable for planting density.
Fourth, the degree of difficulty in sitting between the varieties is different: some varieties grow steadily and easy to sit melon, and some varieties have strong early growth, not easy to sit melon. To this end, scientific management should be carried out according to the characteristics of the species, so as to prevent leggy and increase the fruit setting rate.
5. Diseases and Insects: Diseases such as watermelon virus disease, M.blight disease, anthracnose, etc., Insect pests such as aphids and red beetles will affect the flowering and pollination of watermelons and fruit development in varying degrees. In severe cases, they cause melons, rotten melons, and malformed melons to lose. Commerciality. Measures: Strengthen forecasting and forecasting, select high-efficiency and low-toxicity pesticides for targeted use, and carry out prevention and control scientifically and appropriately.
First, fertilizer and water rations are irrational: cause the stems and leaves to produce flowers or puppies, reduce the rate of sitting and forming "empty." Measures: Control the application amount of nitrogen fertilizer and the time of watering. The watering should be done when the melon fist is reserved. For those appetite-oriented or obstinate fields, they should be pressured to tap or mechanically pick up the leading, or even pick up the heart, supplemented by artificial pollination or hormone treatment to increase the fruit setting rate and prevent "empty defects."
Second, poor flowering environment conditions: First, flowering temperature or high temperature. The optimum temperature for the germination of watermelon pollen is 20°C-25°C. When the temperature is higher than 35°C or lower than 15°C, pollen germination or pollen tube elongation will be seriously affected, which will affect pollination and fruit setting. Second, flowering rain or watering, high humidity in the field, affecting normal pollination, at the same time, water inflow or splash into the flower caused by falling flowers and melons; measures: first flowering does not water; followed by protection of flowers before the rain, such as pollination after the set Bags, covered or buried in soil, will be released in time after the rain. The third is spraying at full bloom. Spraying the spray into the flower will affect pollination, and at the same time, it will also affect insect pollination. Measures: The flowering period is generally not suitable for spraying. If the pests and diseases are seriously in need of leaf medicines, care should be taken to protect the flower plants, after 4:00 pm.
Third, the planting density is too large: poor ventilation and light transmission, plant growth is weak, internodes, petiole slender, thin leaves, pale leaves, small ovary, easy to produce falling flowers or melons, there "empty." Measures: Proper density planting, according to the characteristics of the varieties and the conditions of the soil, it is not suitable for planting density.
Fourth, the degree of difficulty in sitting between the varieties is different: some varieties grow steadily and easy to sit melon, and some varieties have strong early growth, not easy to sit melon. To this end, scientific management should be carried out according to the characteristics of the species, so as to prevent leggy and increase the fruit setting rate.
5. Diseases and Insects: Diseases such as watermelon virus disease, M.blight disease, anthracnose, etc., Insect pests such as aphids and red beetles will affect the flowering and pollination of watermelons and fruit development in varying degrees. In severe cases, they cause melons, rotten melons, and malformed melons to lose. Commerciality. Measures: Strengthen forecasting and forecasting, select high-efficiency and low-toxicity pesticides for targeted use, and carry out prevention and control scientifically and appropriately.
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Shunwang Agricultural Products Co., Ltd. , http://www.qd-foods.com