Bad climate factors
Watermelon is a thermophilic crop, its growth and development temperature is 15-35 °C, 28-30 °C is suitable temperature, below 15 °C below 40 °C will inhibit growth, birth disorders, female flowers and ovary development leads to fruit drop, and Melon, causing watermelon "empty".
The "empty" caused by low temperature during flowering: The low temperature and low temperature make the plant stems grow, so that the vegetative growth can not be transferred into the reproductive growth normally, resulting in pollen development can not be normally fertilized, and then affect the activities of vector insects can not be normal pollination, resulting in falling flowers and melons "empty."
High temperature and drought caused by "empty": the watermelon encountered in the growing high temperature and dry weather, relatively low humidity in the air, low soil moisture content, causing poor nutrition growth, resulting in weak plant growth, poor male pollen development, female flowers Can not be fully inseminated and the occurrence of falling flowers and melon "empty".
The “emptiness†caused by rain during the flowering period: The rain in the flowering period affected the activity of pollinators and led to “emptinessâ€. The rain falls on the stigma and the anther, causing the pollen to develop into an "empty pod" that cannot be fertilized properly.
Strong sun burns and wind damage cause burns, mechanical damage, and flowering and melon production.
Watermelon "vacant" caused by cultivation techniques
The “emptiness†caused by improper planting time: The watermelon was sown from March to July, showing that the later the seeding period, the higher the female flowering stage. Especially in June-July, the average monthly temperature is above 25°C. There are basically no female flowers below 15 knots in the main vine. Because the female flowers have higher growth nodes, the nutrient and water supply are not balanced or insufficient, resulting in falling flowers or melons. ".
Immature planting density caused by "empty": the watermelon planting density is too large, its nutrient growth is strong and positive temperature, high temperature and rainy season, so that the degree of deterrence among plants increased, not air, light, resulting in falling flowers and melons " Empty."
Watermelon “empty†caused by management measures
Improper seedling management makes the seedling grow weaker, female flower and ovary development is not good, so that the fruit set rate is reduced, causing watermelon "empty"; extension of vines at the beginning of field management can not keep up, resulting in vegetative overgrowth, light transmittance between plants, reduced ventilation performance Caused by falling, falling fruit caused by watermelon "empty"; pruning pressure vine unreasonable "promote" and "control" relationship is inconsistent, vegetative growth can not normally transform reproductive growth affect fruit setting, causing "empty".
Improper management of water and fertilizers results in imbalance of growth physiology, inappropriate proportions of nitrogen, phosphorus, potassium, calcium and organic fertilizers, inadequate supply of nutrient elements, or inconsistent nutrient supply, resulting in plant growth and reduced resistance, resulting in flowering and mellow melons. Partial application of available nitrogen fertilizer promotes vigorous nutrient growth, inhibits the normal vegetative growth and transforms the reproductive growth process, causes ovary dysplasia, affects normal fertilization and causes flowering and melon "empty pods", watermelon blooming and top dressing before fruiting Diligence, the use of plant nutrients over-prosperous and produce falling flowers and melon "empty".
Spraying pesticides during flowering period affects pollinator activity and causes watermelons to fail to pollinate normally, resulting in flowering and mellow melons.
Watermelon "empty" prevention
Because of the low temperature during the flowering period, the watermelon "empty" prevention and control method for the flowering temperature of the pollen development can not be normally fertilized plants, should rely on artificial pollination, artificial promotion of sitting melon, to prevent "empty".
Because of high temperature and drought caused watermelon "empty" prevention and treatment methods in the process of growth of watermelon encounter high temperature and drought weather, resulting in male flower dysplasia, can not complete the normal fertilization and can lead to flowering and melon "empty" plants, the production of general use of phosphate fertilizer Water the roots or use 0.50% potassium dihydrogen phosphate water to irrigate the roots, or use large-water irrigation to change air and soil moisture to improve the microclimate in the field, promote pollen development to improve fertilization, and prevent flowering and melons from emptying. Since the plants are free from female flowers due to high temperature and drought, when the melon vines grow to 3-5 meters and still have no female flowers, they should be cut off. Each vine should be 1.50 meters long and then poured 0.50% potassium dihydrogen phosphate water or phosphate fertilizer water. To thoroughly penetrate, to make new hair again, stay in the new vines, prevention and treatment of "empty".
Causes of Watermelon “emptiness†during flowering and rainy days. Rainfall during flowering. Rain prevention measures should be taken in advance according to the weather forecast. The rainy paper hat should be worn on the first day of the afternoon for female flowers to be opened on the 2nd day. To pick the male flowers that will be open to the field, put them in a room with appropriate temperature, and wait until the female flowers at 6-9 o'clock are open to pollinate them with spare male pollen. After pollination, wear a paper hat on the female flowers to prevent raindrops from falling on the top and affect pollination, resulting in falling flowers and melons.
Strong sunburn and wind damage caused watermelon "empty" prevention and treatment methods to prevent burned young larvae, weeds can be used to cover young larvae, to prevent young melon burn, deformity and falling flowers, melon "empty pimple" have a certain role; to prevent wind Harm, we can use wet soil pressure before and after the two stem section of the young melon, to prevent the stems and leaves from shaking caused by the melon "empty".
Watermelon is a thermophilic crop, its growth and development temperature is 15-35 °C, 28-30 °C is suitable temperature, below 15 °C below 40 °C will inhibit growth, birth disorders, female flowers and ovary development leads to fruit drop, and Melon, causing watermelon "empty".
The "empty" caused by low temperature during flowering: The low temperature and low temperature make the plant stems grow, so that the vegetative growth can not be transferred into the reproductive growth normally, resulting in pollen development can not be normally fertilized, and then affect the activities of vector insects can not be normal pollination, resulting in falling flowers and melons "empty."
High temperature and drought caused by "empty": the watermelon encountered in the growing high temperature and dry weather, relatively low humidity in the air, low soil moisture content, causing poor nutrition growth, resulting in weak plant growth, poor male pollen development, female flowers Can not be fully inseminated and the occurrence of falling flowers and melon "empty".
The “emptiness†caused by rain during the flowering period: The rain in the flowering period affected the activity of pollinators and led to “emptinessâ€. The rain falls on the stigma and the anther, causing the pollen to develop into an "empty pod" that cannot be fertilized properly.
Strong sun burns and wind damage cause burns, mechanical damage, and flowering and melon production.
Watermelon "vacant" caused by cultivation techniques
The “emptiness†caused by improper planting time: The watermelon was sown from March to July, showing that the later the seeding period, the higher the female flowering stage. Especially in June-July, the average monthly temperature is above 25°C. There are basically no female flowers below 15 knots in the main vine. Because the female flowers have higher growth nodes, the nutrient and water supply are not balanced or insufficient, resulting in falling flowers or melons. ".
Immature planting density caused by "empty": the watermelon planting density is too large, its nutrient growth is strong and positive temperature, high temperature and rainy season, so that the degree of deterrence among plants increased, not air, light, resulting in falling flowers and melons " Empty."
Watermelon “empty†caused by management measures
Improper seedling management makes the seedling grow weaker, female flower and ovary development is not good, so that the fruit set rate is reduced, causing watermelon "empty"; extension of vines at the beginning of field management can not keep up, resulting in vegetative overgrowth, light transmittance between plants, reduced ventilation performance Caused by falling, falling fruit caused by watermelon "empty"; pruning pressure vine unreasonable "promote" and "control" relationship is inconsistent, vegetative growth can not normally transform reproductive growth affect fruit setting, causing "empty".
Improper management of water and fertilizers results in imbalance of growth physiology, inappropriate proportions of nitrogen, phosphorus, potassium, calcium and organic fertilizers, inadequate supply of nutrient elements, or inconsistent nutrient supply, resulting in plant growth and reduced resistance, resulting in flowering and mellow melons. Partial application of available nitrogen fertilizer promotes vigorous nutrient growth, inhibits the normal vegetative growth and transforms the reproductive growth process, causes ovary dysplasia, affects normal fertilization and causes flowering and melon "empty pods", watermelon blooming and top dressing before fruiting Diligence, the use of plant nutrients over-prosperous and produce falling flowers and melon "empty".
Spraying pesticides during flowering period affects pollinator activity and causes watermelons to fail to pollinate normally, resulting in flowering and mellow melons.
Watermelon "empty" prevention
Because of the low temperature during the flowering period, the watermelon "empty" prevention and control method for the flowering temperature of the pollen development can not be normally fertilized plants, should rely on artificial pollination, artificial promotion of sitting melon, to prevent "empty".
Because of high temperature and drought caused watermelon "empty" prevention and treatment methods in the process of growth of watermelon encounter high temperature and drought weather, resulting in male flower dysplasia, can not complete the normal fertilization and can lead to flowering and melon "empty" plants, the production of general use of phosphate fertilizer Water the roots or use 0.50% potassium dihydrogen phosphate water to irrigate the roots, or use large-water irrigation to change air and soil moisture to improve the microclimate in the field, promote pollen development to improve fertilization, and prevent flowering and melons from emptying. Since the plants are free from female flowers due to high temperature and drought, when the melon vines grow to 3-5 meters and still have no female flowers, they should be cut off. Each vine should be 1.50 meters long and then poured 0.50% potassium dihydrogen phosphate water or phosphate fertilizer water. To thoroughly penetrate, to make new hair again, stay in the new vines, prevention and treatment of "empty".
Causes of Watermelon “emptiness†during flowering and rainy days. Rainfall during flowering. Rain prevention measures should be taken in advance according to the weather forecast. The rainy paper hat should be worn on the first day of the afternoon for female flowers to be opened on the 2nd day. To pick the male flowers that will be open to the field, put them in a room with appropriate temperature, and wait until the female flowers at 6-9 o'clock are open to pollinate them with spare male pollen. After pollination, wear a paper hat on the female flowers to prevent raindrops from falling on the top and affect pollination, resulting in falling flowers and melons.
Strong sunburn and wind damage caused watermelon "empty" prevention and treatment methods to prevent burned young larvae, weeds can be used to cover young larvae, to prevent young melon burn, deformity and falling flowers, melon "empty pimple" have a certain role; to prevent wind Harm, we can use wet soil pressure before and after the two stem section of the young melon, to prevent the stems and leaves from shaking caused by the melon "empty".
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