The reason why tomatoes can't sit is: no control over plant growth, lack of timely ventilation, high greenhouse temperature, lack of nutrient supply due to large amount of fruit or partial fertilizer, unreasonable ratio of anther, etc. Caused by improper. Therefore, in the fruiting period of tomato blossoms, the following several management must be done well.

First, control the growth of tomatoes and prevent leggy. Excessively high temperatures, especially high night temperatures, will increase plant nutrient consumption and reduce accumulation, resulting in poor flower bud differentiation and fruit setting difficulties. Larger soil moisture and excessive use of nitrogen fertilizers also tend to cause growth and affect flowering fruit setting rate.

After a lengthy occurrence, 15% paclobutrazol (1500 times) or auxin (500 times) can be sprayed to inhibit vegetative growth. It is also necessary to control the temperature inside the shed to increase the temperature difference between day and night and avoid plant growth.

Second, avoid high temperature effects. When the temperature in the shed reaches 35 °C, and it lasts for more than 2 hours, it will cause the flower bud differentiation of tomatoes to be blocked. At night, it is generally 12 °C -18 °C, especially at night, the temperature should not be too high, otherwise the stalks will grow in length and appear easily. Falling flowers.

Again, avoid excessive supply of nutrients and insufficient nutrient supply. Too much fruit is left in the plants, and most of the nutrition is absorbed by the lower fruits, which affects the flowering and fruit setting of the upper ear of the tomatoes. At the same time, paying attention to reasonable fertilization during flowering results will also result in insufficient supply of nutrients for the fruit and fruit.

The method to be taken: Generally, the first and later methods should be adopted. For example, the first fruit should be left 3, the second fruit should be left 3-4, the third fruit should be left 4, and the upward ear should have 4-5 fruit. . If the growth of the plant is very weak, the first fruit should not be left, and fertilizer should be cultivated in time to maintain the roots, maintain the flowers, and attack the fruit.

Finally, the ratio of anthers should be reasonable. Pay attention to the temperature when you spend some time. When the temperature is higher, the concentration of the anthers should be reduced appropriately.

In addition, boron, calcium and other trace elements are added before flowering. The boron element directly affects flower bud differentiation, and boron deficiency can cause tomato flowering and fruit setting. Spraying foliar fertilizers containing trace elements such as boron and calcium may play a role in flower protection and fruit preservation to a certain extent.

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