What to do if the watermelon sitting rate is low
1. Pay attention to site selection and base fertilizer application
1.1 Watermelon growth habits: like warmth, sufficient sunlight, drier air, and moderate rain. Therefore, watermelon should be planted in a warm climate, good sunlight, long sunshine, moderate rainfall, low air humidity, low groundwater level, and good irrigation conditions. , The soil is deep and rich in organic matter, the temperature difference between day and night is large, and the soil is sandy or loamy.
1.2 When planting, use 5-6 years of crop rotation, such as rotation with rice, to overcome the obstacles of continuous cropping, and to ensure that more melons are sitting and stable.
1.3 When watermelon is fertilized, using mature farm manure as base fertilizer can greatly increase the setting rate, yield and sugar content of melon.
1.4 Before plowing the watermelon field, apply 2500-3000 kg of cow manure, 100 kg of cake fertilizer, 40-50 kg of calcium-magnesium phosphate fertilizer, and 1.5-2 kg of borax per 667 m2 of medium-fertility land.
1.5 Deep turn and fine rake 1-2 times and then turn it into a suitable border or ridge.
2. Reasonable dense planting and regulation of plant growth
2.1 Watermelon cultivation density: flexibly determined according to soil fertility, type and amount of fertilizer, watermelon varieties, cultivation methods and cultivation time, etc.
2.2 Stand-up vine cultivation: 1300-1400 plants per 667 square meters for early-maturing varieties, 1000-1200 plants per 667 square meters for mid-late-maturing varieties
2.3 Climbing cultivation in open field: 800-900 plants for early-maturing varieties per 667 square meters, and 600-700 plants per 667 square meters for mid-late-maturing varieties.
2.4 Pruning of branches and vines: It needs to be carried out according to the growth of watermelon plants. The vines that sprouted from the stem nodes before and after the female flower should be cut off in stages, which can effectively increase the rate of melon sitting.
3. Artificial pollination
3.1 Artificial pollination can greatly increase the pollination rate and the sitting rate, and increase the sitting rate by 20-30%.
3.2 Try to complete artificial pollination after the male flowers of watermelon bloom, which can effectively increase the pollination rate.
3.3 The best time for artificial pollination: 8-11 am.
3.4 One male flower can pollinate 3-5 female flowers.
4. Pharmaceutical treatment
4.1 Watermelon flower bud stage, after the female flower fades, and the young melon fist size
Spray 25kg of 0.3% potassium dihydrogen phosphate solution per mu each time to increase the sitting rate, yield and sugar content, and enhance the ability to resist diseases, insects and drought.
4.2 When the young fruit is the size of a walnut
1g of 80% naphthaleneacetic acid soluble powder, dissolve it with 50g of powder, add 24kg of water and dip the young melon with a clean brush.
4.3 Cotyledon and 2-leaf stage of watermelon
Brewing 1kg of vinegar + 25kg of water, spraying 25kg per mu each time, the melon setting rate and yield can be increased by 15-20% and 30-35% respectively.
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