Watermelon empty control measures

First, the adverse climate factors led to the prevention and control of open space (a) due to the low temperature during the flowering period. For plants that do not normally fertilize due to pollen development at low flowering temperatures, artificially assisted pollination should be used to artificially promote melons to prevent emptying. (b) Open due to high temperature and drought. If the watermelon encounters high temperature and dry weather during the growth process, it will cause the male flowers to be stunted, and the normal fertilization can not complete the normal flowering and metamorphosis. The production usually uses the phosphorus fertilizer water or the 0.5% potassium dihydrogen phosphate solution to irrigate the roots. Or use large-water irrigation to change the air and soil moisture to improve the microclimate in the field, promote pollen development, prevent flowering and melons from becoming empty. If there is no female flower in the plant when the temperature is high and drought is 3 to 5 meters, the melon vine should be cut off. After 1.5 meters long, 0.5% potassium dihydrogen phosphate solution or phosphate fertilizer should be poured. Water, to be thoroughly irrigated, to make new vines, stay on the new vines, and control empty areas. (3) The rainy season leads to empty weather. If there is rain during the flowering period, rain prevention measures should be taken in advance according to the weather forecast. On the afternoon of the previous day, the female flowers to be opened on the second day are put on rain-proof paper hats. The male flowers to be opened are picked in the field before 5 o'clock in the next morning. The wells are placed in a room with suitable temperature, and the female flowers are opened when the flowers are opened from 6 to 9. At the time, artificial pollination was performed using alternate male pollen. After pollination, wear a paper hat on the female flower to prevent the rain water from falling on the top and affecting the pollination, resulting in falling flowers and melons and empty. (d) Strong sun burns and wind damage lead to open air. In order to prevent intense sunlight from burning young larvae, weeds and vines collected from pruning can be used to cover young larvae. This will have a certain effect on preventing juvenile melons from burning, deforming and falling flowers, and turning melons into empty pods. In order to prevent wind damage, two stem sections before and after juvenile melon can be weighed by wet soil.

Second, improper cultivation techniques lead to the prevention and control of open space (I) Improper sowing time leads to open space. Should be timely early seedlings early cultivation, in order to cultivate strong seedlings for the purpose of the flower bud differentiation period staggered high-temperature stage, reducing the female flowering bio-nodes, to promote the early fruiting melon, to prevent empty watermelon. (b) Inadequate planting density results in open space. Watermelon planting density should be determined according to species and soil conditions, to avoid excessive density, inter-plant cover, poor ventilation and light transmission capacity caused by falling flowers and melons and empty. Medium and late-maturing watermelons are planted with 600 to 800 per mu, and super watermelons are planted at 350 to 400 per mu, and very early-maturing and small-fruit-shaped watermelons are planted at 1,000 to 1300 per mu. Timely tipping and snoring are used to enhance ventilation and light transmission, and to promote sitting and melon prevention.

Third, improper management led to the prevention and control of open space (A) to strengthen the field management at the seedling stage, through the cultivator, fertilization, and promote flower bud differentiation; extending vines through late pruning, vine pressure to inhibit vegetative growth, coordinate the relationship between vegetative and reproductive growth, promote nutrition Growth to reproductive growth transfer, increase the rate of sitting to prevent watermelon empty. (b) Strengthen the management of water and fertilizers and increase the rate of sitting. During the seedling stage, the vines will be poured and the water will be stretched to extend the vines and increase the nutrient area. The proportions of nitrogen, phosphorus, potassium, calcium fertilizer and organic fertilizer should be reasonable to prevent the occurrence of excessive nitrogen fertilizer and madness and runaway. . In general, 7.5 kg of ammonium diammonium phosphate per acre, 8 kg of potassium sulfate, chasing water and fertilizer in dry days, rain grain recovery fertilizer. After flowering, from the hair removal to a fixed period, you need to chase a fertilizer once to promote the fruit setting. Method: 7 days after flowering, young fruit hair removal, dig 15 cm deep in the ridge from the root of the melon plant 20 centimeters away The top of the hole dressing, topdressing 10 kg of urea per mu, potassium sulfate 10 kg, each watering 1 to 2 kg, the top dressing watering can not be as early nor late, early flowers and young melons are promptly falling, too late Watermelon swelling is not good, resulting in a small, malformed or dried watermelon.

IV. Spraying pesticides during the flowering period will lead to the prevention and control of flowering time. Avoid spraying pesticides or spraying pesticides as much as possible. For the melon fields that cannot be normally pollinated due to insecticides that cause pollinating insects to reduce or kill pollinators due to spraying of pesticides, manual pollination must be carried out to artificially promote melons to prevent emptying.

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