to prevent zucchini from dropping flowers and fruits.

The temperature was strictly controlled during the flowering and fruiting period of zucchini. The temperature in the greenhouse was controlled at about 26 ℃ during the day and not less than 15 ℃ at night. Uncover the grass curtain in time to prolong the light time and increase the light intensity as much as possible. Strengthen the management of water and fertilizer if the leaves of the plant are thick and green, but blossom but do not bear fruit, the water and fertilizer must be strictly controlled, and the vine head should be pressed with a larger piece of soil to inhibit the crazy growth of the plant. If the plant is thin and the leaves are yellow and thin, it is necessary to increase water and fertilizer, remove the first female flower and promote vegetative growth. Timely prevention and control of diseases and insect pests, strengthen ventilation, reduce humidity in the greenhouse, apply pesticides regularly, remove fallen petals and diseased leaves, and apply a layer of carbendazim powder on the petals at the top of zucchini fruit. It can prevent bacteria from invading the fruit and causing shedding. Timely supplement of boron fertilizer in zucchini bud emergence, foliar spraying chlorophyll or spraying treasure every 10 days or so to prevent flowers and fruits from falling due to lack of trace elements such as boron. To prevent poor fertilization at about 10:00 in the morning, the female flowers to be bloomed were selected and dipped in the flowers with a concentration of 20 × 10 ~ (- 6) of 2,4 ~ D and 30 × 10 ~ (- 6) of gibberellin to promote fruit expansion and prevent poor fertilization.