(1) Pay attention to remove the redundant female flowers in time! Especially, the overwintering cucumber is under the environmental conditions of short sunshine and large temperature difference from seedling stage to fruiting stage, which is very beneficial to the differentiation of female flowers and buds. From section 3 to section 5, there are female flowers in each section, or even more than one female flower in each section. If too many female flowers are allowed to grow and develop at will, it will consume a lot of nutrients, which will not only affect the results, but also cause serious yield reduction and shorten the economic life. In order to maintain the robust growth of melon seedlings, increase yield and prolong economic life, redundant female flowers should be thinned regularly, and it is strictly forbidden to use chemicals such as zenggualing and ethephon to promote flower bud differentiation of female flowers! In order to prevent excessive female flowers and premature senescence of melon seedlings. Excess female flowers should be thinned out as soon as possible. Generally, you should choose 1 melon every two sections. In Miao Zhuang, seedlings can be interplanted 1 melon every 2 or 3 knots. The remaining female flowers should be thinned as soon as possible. The earlier the thinning, the less nutrient consumption and the higher the yield.
(2) Pay attention to the growth of melon seedlings and adjust the relationship between balanced vegetative growth and reproductive growth in time. Under normal circumstances, the growing point is light green, the leaf size is moderate, the flowering node is 5-6 nodes (about 50 cm) below the top, the female flower is drooping and opening, and the fruiting node is 9- 1 1 node (about 100 cm) below the top. If the flowering nodes are less than 4 nodes, the mature nodes are less than 8 nodes, and the length from the growing point is less than 80 cm, the female flowers at the growing point should be properly removed, and the melons should be picked in advance to reduce the plant load. To raise the night temperature to above 18℃, combined with watering, topdressing available nitrogen and potassium fertilizer, strengthening topdressing outside the roots, and spraying 0.7% brown sugar and 0.4% urea solution continuously every 10 ~ 1000 times 1 time.
If the vegetative growth is weak, flowers have been topped. On the basis of increasing the night temperature and strengthening the management of fertilizer and water, spraying 600 times long essence (or 100 mg/kg gibberellin) to promote the topping of seedlings. Topdressing in the ground combined with hoeing melon ridges can improve root hypoxia, and irrigating 0.2% urea solution and 5 ~ 10 mg/kg NAA liquid medicine (or 500 times of drought and flood) can promote new roots, promote seedlings by roots and alleviate the phenomenon of topping.
If the flowering pitch of female flowers is more than 6 knots and the distance is more than 60 cm, the pitch of mature melons is more than 12 knots and the distance from the head of melons is more than 120 cm, which means overgrowth of nutrition and will also cause a large number of melons. Management should appropriately reduce watering, reduce nighttime temperature, postpone picking melons, or spray melon seedlings with 1000 times synergist or 100mg/kg paclobutrazol to appropriately inhibit the vigorous growth of melon seedlings. Dip flowers with 2,4-D 30 mg/kg, gibberellin 100 mg/kg and chlorpheniramine 0. 15% solution to improve fruit setting rate and promote fruit setting.