Watermelon does not affect the yield of watermelon how to improve the percentage of watermelon

Watermelon sitting period can not sit melon gives melon farmers a headache, how to improve the watermelon sitting rate. The editor's suggestion:

Watermelon field

1. Pruning and pruning: using three-vine pruning, when the watermelon main vine is 150cm and the seed vine is 30-50cm, keep the main vine and two strong sub-vines, cut off the excess sub-vines, and become a three-vine type, in order to concentrate nutrients and promote the watermelon to blossom and bear fruit earlier. Especially when flowering, the seed vine sprouting at the front and back nodes of the female flower is cut off for 2 or 3 times, which is beneficial to fruit setting.

2. Artificial pollination: after watermelon blossoms, choose the appropriate fruit-setting node. At 6: 8 a.m. every day, use the male flowers of the same day to gently touch the female flowers of the same day, and then pollinate artificially. After lighting the flowers, the female flowers will be wrapped in a paper bag prepared in advance to prevent Rain Water from entering. After setting fruit for 3 to 5 days, remove the paper bag or put it under the small watermelon. This can improve the fruit setting rate of watermelon in cloudy and rainy days.

3. Core-picking or stem-pinching to protect fruit: after the watermelon is set, 10-15 leaves are left on the upper part of the main vine to control the growth of the main vine, concentrate nutrients and promote the expansion of watermelon. Or pinch hard on the stem vine behind the baby melon and hear a "click bar", so that nine times out of ten, the young watermelon can sit still.

4. Rational fertilization and control of growth: control the use of nitrogen fertilizer, increase phosphorus and potassium fertilizer, reduce watering times, and adopt methods such as strengthening pruning and deep burying vines to control vegetative growth. Before and after flowering, the fruit rate of watermelon can be increased, the growth can be promoted and the quality of watermelon can be improved. When the watermelon grows to the size of fist, 10kg / mu of compound fertilizer and 50kg / 75kg of vegetable cake can be applied to supplement nutrients and promote the growth and expansion of watermelon.

watermelon

5. Timely control of diseases and pests: continuous rainy days are the high incidence period of watermelon anthracnose, Fusarium wilt and other diseases, which need timely prevention and control. The methods are as follows: timely removal of ① diseased leaves and cutting of diseased branches. Drainage ditches were opened around the ② melon fields to lower the groundwater level. ③ uses 1500 times chlorothalonil foliar spray to control watermelon anthracnose every 7-10 days or sunny days. To control Fusarium wilt of watermelon, after removing the diseased plants, copper preparation was applied to the root. ④ can use 25% aphid Kexing 1000 times liquid spray to control aphids.

6. The fruit setting rate of watermelon can also be increased by spraying vinegar, cytokinin or gibberellin.

Spray vinegar. When watermelon seedlings grow 1-2 true leaves, 500 times vinegar is sprayed before and after flowering, the ripening period of watermelon is 5-6 days ahead of schedule, and the yield is increased by 30%-35%.

Spray cytokinins. When watermelons are sprayed with cytokinin solution at flowering stage, the fruit setting rate of watermelons can be increased by about 20%, the sugar content can be increased by 1.5% by 2 degrees, and the yield can be increased by 27% and 30%. Usage: in late May or early June, when the watermelon vine has 5-8 knots, spray for the first time; after the first spray, concentrate the buds and spray for the second time; spray once every 5 days, usually 4 times. The concentration of cytokinin was 50 g of mitogen dissolved in clear water of 25kg each time. For the first and second times, 25 kg of mitogen aqueous solution was sprayed per mu, and 50 kg was used for the third and fourth times.

Spray low concentration of gibberellin. Spray young watermelons the size of walnuts with 20~30ppm gibberellin. Practice: take 1 gram of gibberellin, dissolve it with 50 grams of alcohol, then add 30kg cold boiled water to make 25ppm gibberellin aqueous solution, spray melon with a small sprayer, or apply tipsy with a brush. After 3-5 days, the young watermelon has obvious growth.