Because last year's tomato "yellow peel" surged, people in southern lying stone village had to change the traditional one-year-old large-scale cultivation of tomatoes, but to "change" also understand the reasons for "change." The man in the South lying stone village asked: A 50-meter-long shed, Huangpi fruit out of 2500 kg, almost no good tomatoes in the entire shed.
Huangpiguo has also happened from time to time, but it has never been so serious. The cause of the yellow peel fruit is still not conclusive. Through the investigation, apart from the differences between varieties, we suspect that the tomato yellow peel causes are as follows:
1. Temperature factor. Temperature may be the biggest cause of tomato yellow peel. When the tomato yellow peel is not serious, the yellow peel appears most often in the front of the booth and near the vents. The common feature of these places is the low temperature and dramatic changes. According to the study, lycopene formation was inhibited at temperatures above 32°C, and the ripening period of green fruits was severely affected by low temperatures below 8°C. The formation of lycopene was disturbed and destroyed, and even if given at the appropriate temperature, the fruits did not turn red again. Skin fruit. Severe changes in temperature and temperature may also cause poor coloration of tomatoes and yellow peel. Li Wei, a local vegetable farmer, said: "Last year, the weather was hot late autumn and late autumn, hot during the day and cool at night, and it was very cold at night. People wear thick clothes, but some sheds don't have vents at night, and there is a temperature difference between day and night. How can a big tomato make it grow?"
2. Fertilizer conditions. It has been observed that tomatoes are more likely to develop yellow bark in places where there is sufficient fertilizer and water, and plants are growing too prosperous. And the front of the shed is usually a place where water accumulates. Fertilizer, especially nitrogen fertilizer, is beneficial to the formation of chlorophyll in fruits, while lycopene, which is required for ripening of tomato color, is hindered and there are more yellow peels. High nitrogen deficiency potassium, which may be the cause of tomato yellow skin. Therefore, the amount of nitrogen fertilizer should not be too large in the tomato's result period, but the application of potassium fertilizer should be emphasized.
In addition, some experts believe that the production of yellow peel may be caused by a virus. Although viruses are often susceptible to disease in high temperature and drought conditions, some viruses also occur at low temperatures. For example, some viruses in apples and peaches show symptoms during germination in spring, and mosaics are severe. After the temperature rises, In a recessive state, the mosaic disappears. Moreover, some vegetable farmers have reported that more occurrence of yellow peel occurs when insects such as whitefly occur.
Once it appears, it can't be eliminated. It can only be sold or thrown away at a very low price. To solve the yellow peel can only be prevented in advance. we suggest:
First of all, we must choose a variety of anti-peeled and yellow peel fruit.
Second, pay attention to the temperature management of tomatoes. The tomatoes belong to thermophilic vegetables, and the suitable temperature for breeding is 20-30°C. In the autumn evening, the temperature is preferably not lower than 15°C. It is necessary to pay attention to closing the vent in the afternoon and keeping the temperature inside the shed. Severe changes in temperature often cause problems such as yellow peel, some careful farmers, suspended in the vicinity of the vents a layer of film, so that the outside air is not directly stimulate the tomatoes, but also effective.
Again pay attention to fertilizer management and pruning. Pay attention to fertilizer according to the requirements of tomato fertilizer at different stages of fertilization, before planting fruit can be more appropriate nitrogen fertilizer to promote plant growth, set fruit more potassium fertilizer to promote fruit development. Spraying chitin and composite micro-fertilizer and 6000-fold love-increase can increase the resistance of the plant and reduce the incidence of yellow peel. As a result, the soil in the shed should not be excessively dry. In the middle and late stages of plant growth, it is necessary to ensure good ventilation and light transmission in the shed. If the leaves of plants are too lush, some of the leaves can be cut off.
Can not rule out the yellow peel is caused by the virus, so pay attention to pest control, prevent pests spread of the virus. The prevention and control of pests, especially the sucking and sucking mouthparts, can be achieved through measures such as installing insect nets, hanging yellow armyworm boards, and chemical control measures in shelters, etc., which are effective for preventing virus diseases.
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