Causes of flower and fruit drop of white melon and preventive measures

1. Causes of flower and fruit drop There are several main reasons for white melon flower and fruit drop. First, the application of base fertilizer, especially the partial application of available nitrogen fertilizer, causes the branches and leaves to grow and inhibits the differentiation of flower buds; the second is that the long-term low temperature in the environment hinders the plant Growth and development; third, high humidity, saturated or over-humid soil moisture, which seriously affects the transpiration of leaves and the absorption of roots, causing pollen to be difficult to emit or to rupture pollen, which affects the fertilization rate; fourth is insufficient light , So that the nutrient is accumulated and watered, the sugar content is low, and the quality is poor.

2. Preventive measures 1. Improve the environment. First of all, the accumulated water in the soil should be removed in time to promote the germination of new roots. The plastic film should be opened in sunny days to keep warm and supplement the light, and promote the growth of plants. At the same time, pay attention to opening the greenhouse in rainy days. Side or greenhouse base film, so that it can supplement scattered light in rainy days.

2. Regulate the growth of vines. For plants that are already elongated, you can spray paclobutrazol, generally 40 grams of paclobutrazol per mu is mixed with 50 kg of water, or mepiquat 10 ml per mu, sprayed with 40-50 kg of water, can be obvious Inhibit the growth of vines of plants, can concentrate nutrients on fruit expansion, improve yield and quality.

3. Inducing sitting melon, you can use Zuogualing or Zuoguoling to treat the female flowers to make the sitting rate of more than 90%. In the afternoon of the first day of the female flowers or the day of opening, spray the fetus with 200 to 400 times of Zuogualing, or Apply 10-20 times Zugualing solution on the stalk, the effect is better, can obviously improve the rate of sitting.

4. Artificial-assisted pollination. White melon is a male and female flower growing on the same plant, and the female flower is a bisexual flower. In order to increase the rate of sitting melon and reduce the phenomenon of flower and fruit drop, artificial auxiliary pollination can be adopted. After picking the male flowers, apply their pollen to the stigma of the female flower. Generally, each male flower can pollinate 2~3 female flowers. , Pollination time is carried out at 7-9 am on a sunny day or 4-6 pm in the evening, and try to avoid the high temperature and strong light period.

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