With the continuous development of the production of vegetables in protected areas, the occurrence of physiological diseases of tomatoes in the protected areas has been aggravated. The damage rate is generally 15% to 30%, and the weight is as high as 50% to 60%, which causes great losses to the production. Through experimental research, this type of disease is mainly caused by non-infectious diseases caused by improper cultivation and management measures. The current production of more common seedlings are leggy, deformed fruit, empty fruit, tendon rot, umbilical rot, cracked fruit, sunburn disease, poor fruit coloring, frost damage fruit, leaf curling, falling fruit, flowering branches, no growth point Wait. In order to prevent the occurrence of these phenomena in production, we invite senior Cao Hua, a senior agronomist from Beijing Agricultural Technology Promotion Station, who has many years of experience in vegetable production, to answer questions concerning technical issues in phases. --editor
A friend from a farmer in Shunyi District asked: What are the causes of the tomato seedlings that are thin and tall and the festivals are very long? How can we prevent them?
Teacher Cao: This phenomenon belongs to the Tu long seedlings. It is caused by high night temperatures, insufficient illumination, and excessive soil moisture. In particular, it is planted in the fall and nursed in the summer and autumn seasons. The nighttime temperature is too high, and there may be seedling festivals. Extending, a phenomenon of leggy, resulting in seedlings up to 30-40 cm, when planting is not easy to handle and easy lodging, breaking. More importantly, it affects the differentiation of flower buds, and it is difficult to achieve the goals of large fruit, abundant panicles, and high yield. In early spring, some varieties emphasize that the temperature should not be too low during flower bud differentiation and development. In early spring, the method to prevent leggy seedlings is to properly control the moisture, or to cut off the roots to achieve water control purposes. Sub-seedlings on the bed should be dug up early, and they should be regularly raked. Gradually dilute; the seedlings of the container should be adjusted to the size of the seedlings, dilute, etc., and the roots must be cut off in the soil or container to achieve control of the seedlings. The leggy. Through the cultivation measures to adjust the temperature, moisture, fertilizer, etc., especially the night temperature should not be too high, generally about 15 °C is more appropriate to achieve the purpose of controlling seedling growth or plant robust. Should also be based on different cultivation seasons to select appropriate effective control measures, such as in addition to temperature in the cold season can also control the growth of water; and in the hot season, the temperature is high, often by pouring night water to cool. When the temperature and moisture cannot be controlled in the high temperature season, the growth can be controlled by the fertilizer, that is, the amount of the fertilizer is appropriately increased and the concentration of the soil solution is increased. The purpose of controlling the growth speed of the plant and preventing leggy can also be achieved. In the absence of any of the above-mentioned measures, chemical means can be used, such as the use of chlormethods and other methods to prevent leggy. However, it is necessary to strictly control the concentration and dosage. In particular, it should be pointed out that if it is organic food or green food, do not use chemical means to control leggy.
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