Tomato leaf rolling is just the external manifestation of illness, and it is the physiological response of crops to coping with adverse environmental or biological hazards. Tomatoes, whether they are planted in open field or in protected areas, are the most commonly encountered by farmers. They are the problem of "rolling leaves." First, due to improper cultivation and management measures, from the lower leaves to the upper leaves, there is the addition of trace elements in the soil. insufficient. Thus seriously affecting the normal growth of tomatoes and yield formation. Therefore, we should start from the cultivation and management of the right medicine. The causes of the disease and its treatment methods are described below:
First, fertilization should pay attention to the reasonable mix of fertilizers, should use a variety of mixed application of micro-fertilizer and other fertilizers. Excessive leaf fertilization caused by stiff fertilization or edge curling, necrotic spots or brown bands appear between veins. How fertilization is based on the yield of tomato, and the amount of fertilization once applied should be determined by the current number of ears.
Second, when planting tomatoes, they encounter high temperature and dry weather and can't make up for water in time. At this time, the leaf area is large. High temperature and strong light make the transpiration of the leaves stronger, and the stomata of the leaves close, causing the leaves to curl. To control the temperature according to the tomato and growth forms and development conditions, in the greenhouse cultivation, in the middle and late growth stages and easy to appear this situation, timely watering and fertilizing after fruit set, drought should be avoided, with emphasis on tomatoes can not be poured at high temperature noon water. Tomatoes grow slowly when the temperature is above 30°C, increasing photorespiration and affecting nutrient accumulation. For temperatures above 35°C, the water transpiration of the plant leaves is rapid, and it is very easy to cause the dehydration of the leaf surface to curl up.
three,. Ventilation in the shed is too intensive, and indoor and outdoor warm and cool air exchange is strong, causing the tomato leaves near the vents to turn over. In the greenhouse cultivation, it is easy to occur in the middle and late stages of growth. Closures are often severe at the vents. As long as the air is gradually released, no such problems will occur. Tomatoes are produced in protected areas in the cold season. When the greenhouse temperature is insufficient to ensure the tomato growth requirements, it is recommended to add additional geothermal heating or temporarily increase the temperature of the fire to promote growth. At the same time spray about 7500 times liquid Bi conservation, combined with spray water to spray fertilizer 1 to 2 times. When leaves are yellow, foliar fertilizer can be sprayed for conditioning.
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