After the National Day, the tomatoes in winter greenhouses were transplanted and planted one after another. In the past few days, some farmers telephoned to report that they had stopped growing on the top of the tomato seedlings cultivated on the seedbeds. There has been a phenomenon of “self-sealing,†which happened in previous years. The farmers did not understand why they had been caused by cockroaches. Recently, the author came to Liu Fuye, a village in Daliu Village, Cuizhai Town, Jiyang County, Shandong Province. This year, his tomato seedlings appeared on the seedbed and this self-sealing phenomenon occurred.
In Liu Fuye’s seedbed, we found that the top of the tomato was naturally capped and the upper segment was thinner. Through field observation and analysis, there are two main reasons that cause the top of the tomato to stop growing.
First, temperature difference between day and night Small tomatoes are hi-temperature crops that are sensitive to temperature. When the seedling temperature is above 28°C, the stems and leaves begin to stop growing, and the stems and leaves above 45°C appear sunburn. The tomato growth requires a certain temperature difference. The protected tomato is grown at a temperature of 25-28°C and the night temperature is 13-17. °C is best. In combination with the temperature changes during the day, at 25-28°C in the afternoon, the full ventilation will be reduced to 20-25°C in the afternoon and the ventilation will be stopped before and after the evening. The temperature in the middle of the night is slightly higher at 14-17°C, and the middle of the night is 12-13°C. Suitably, if the night temperature is longer than 17 °C for a long time, it is easy to cause the tip to stop growing. In production, attention should be paid to temperature management, especially night temperature management. If it is sunny, early nights can be taken to control the night temperature.
Second, boron deficiency According to our observations in recent years, without the application of boron fertilizer, tomato tip is prone to yellowing to stop growing, if excessive boron deficiency, the top part of the occurrence of yellowing also stopped growing, and even withered. Therefore, boron fertilizer must be added to the soil in seedbeds and fields. Boron fertilizer can be used as a base fertilizer, 1.5 kg of boron can be used per mu, and organic fertilizer can be used after each stacking, or 6000 times liquid natural brassin lactone-Shuofeng 481 and 800 times liquid Fuli boron can be applied on the foliar. it is good.
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