How to improve the fruit set rate of watermelon?
Water-assisted pollination of watermelon can increase fruit set-up rate by 80% to 90%, and increase production by 10% to 15%. The method is: At the time when the male and female flowers of watermelon are opening, at 6 to 9 o'clock in the morning, the male flowers are removed, the petals are removed, and the pollen is applied to the stigma of the female flowers gently. Each male flower can be coated with 3 to 4 female flowers. When the pollination is light, the ovary must not be touched by hand to prevent it from being affected by mechanical operations. Also, use a loose brush to pick up the pollen on the open male anther and gently apply it to the stigma of the female flower. One, stolons. If you want the young melons to sit steadily, you can force them on the stems of the young melons. When you hear the coughs, the young melons can sit tight. As the saying goes: "Cough behind, before the melon." Second, point naphthalene acetic acid. The method of spotting is to first weigh 1 g of naphthylacetic acid, dissolve it with 50 g of alcohol, and then mix it with 24 kg of water and make up a concentration of 40 PPM (ie 10 parts per million). Use a clean brush or small sprayer to dip or spray. On walnut-sized larvae, wetness was used as a measure. Its role is to make young larvae not fall off, and can stimulate the larval cell division and promote watermelon growth. If the female flower is not open, spraying the leaf surface can also accelerate the differentiation of the female flower and form the young melon early. Third, spray cytokinin. The spraying of cytokinin solution on the flowering watermelon can increase the rate of saplings by about 20%, increase the sugar content by 1.5 to 2 degrees, and increase the yield by 27% to 30%. How to use: In the late May or early June, when the vines have 5-8 knots, spray for the first time; after the first spray, the buds are concentrated and sprayed for the second time; then spray every 5 days or so The last spray should be around June 20. Generally spray 4 times. If the mouthwash time permits, spray it once more. At the concentration of cytokinin, 50 g of mitogen can be dissolved in 25 kg of clear water at a time. The amount of water used was 245 kg for the first and second time, and 50 kg for the third and fourth time. The cytokinin is soaked for 3 hours to 5 hours before spraying. 50 grams of cytokinin can be soaked with 1 kilogram of clear water. After stirring, weigh 500 grams on a backpack sprayer and add 12 kilograms of water to spray. Spray time, sunny days should be sprayed after 5 pm, cloudy days can be sprayed all day. Fourth, spray low concentrations of gibberellin. The use of 20ppm to 30ppm gibberellin to spray walnut-sized juvenile melons has a significant effect on improving the rate of watermelon sitting. The practice is to first weigh 1 g of gibberellin, dissolve it in 50 g of alcohol, and then add 30 kg of cold water to the water to make a 25 ppm aqueous solution. Spray the melon with a small sprayer, or apply it with a brush. After 3 days to 5 days, the baby will have a significant increase. Fifth, spray vinegar. When the watermelon grows cotyledons and there are 1 to 2 true leaves, watermelon before and after the open clothes, each spray 500 times liquid vinegar (vinegar 1 kg, 500 kg of water), vinegar than vinegar Watermelon matures 5 days to 6 days earlier and the yield increases by 30% to 35%.