First, the tomato umbilical rot mainly manifests in the subsidence of the top of the fruit, which turns black, and the area gradually expands. After the bacteria invade, the fruit is rotten. The main cause of this physiological disease is soil drought, the formation of calcium deficiency in the fruit parts of the plant, so the disease occurs more often at high temperatures and droughts. The cultivation should pay attention to the soil should not be arid, nitrogen fertilizer should not be applied too much, should apply more organic fertilizer, while paying attention to the lack of calcium in the soil.
Second, tomato malformation occurs mainly in the first ear, there are a small number of individual fruit in the second ear, mainly to form a variety of odd-shaped multi-carpel fruit. The reasons for this phenomenon are: low temperature during nursery, excessive nitrogen fertilizer, high soil moisture, excessive nutrient growth, and abnormal ovary development. Therefore, during the nursery period, the temperature should be kept at about 20°C during the day and the temperature should be controlled below 10°C at night. Apply less nitrogen fertilizer and do not over-irrigation. This can overcome the occurrence of malformed fruit.
Third, the tomato rib fruit or pulp tissue necrosis of the vascular bundle becomes dark black or the vascular white of the pulp becomes white ribs. Black ribs occur in weak light, excessive vegetative growth, excessive dense planting, excessive nitrogen fertilizer application, and abnormal metabolism during fruit development. White ribs are caused by potassium deficiency and excessive absorption of ammonia nitrogen. In fact, we should pay attention to soil drainage in greenhouses and greenhouses. When the light is insufficient, the temperature should not be too high. It should be well ventilated during the day. Do not apply too much nitrogen fertilizer. It should be properly planted in close proportion. The appropriate amount of potash fertilizer and boron fertilizer should be used. The best use of nitrate nitrogen fertilizer is not appropriate. excessive.
Fourth, the poor fruit coloring The tomato fruit is not red and yellowish brown when it matures. The reason is weak light, low temperature, excessive application of nitrogen fertilizer, fruit chlorophyllolytic activity is low. The solution is not to over-close the plant, apply less nitrogen fertilizer to prevent excessive nutrient growth, while the temperature should not be too low.
Fifth, the surface of fruit can be seen on the surface of the fruit of the reticulate fruit. The fruit has a reticular pattern and the fruit matures slowly. Mainly due to soil drought, the roots can not well absorb phosphorus, potassium or phosphorus, potassium fertilizers move in the plant body is difficult, causing plant metabolism disorder. Therefore, we should pay attention to appropriate irrigation to prevent soil drought.
6. Empty fruit The empty fruit of tomato shows that the growth of the placental tissue of the fruit is not substantial, the flesh is not full, and the surface is covered with kerfs. The main reason is poor fertilization, seed degradation, and poor development of placental tissue. Excessive application of nitrogen fertilizer, excessive use of growth regulators, rapid or excessive temperature during fruit expansion, and insufficient light. Control methods: Strengthen the management of fertilizers and waters, paying special attention to the supply of fertilizers and water at the later stage of harvesting. The growth regulator should be reasonably used with changes in temperature, and the concentration and period of use should be properly understood.
VII. The main reasons for flowering and fruit drop: First, flower bud differentiation, lack of fertilizer, high night temperature, small temperature difference between day and night, drought or excessive moisture, poor flower quality caused by insufficient sunshine, style distortion, short style, no stigma, ovary deformity Physiological defects caused by falling flowers; the second is in the flowering period, lack of light, high night temperatures, temperature and humidity control ups and downs, fertilizer and water shortages or large plump water caused by falling fruit. Control methods: Cultivate strong seedlings, strengthen the control of temperature and humidity, timely and appropriate amount of fertilizer, and reasonably control the night temperature. Use 15-20 mg of 2,4-D or 30-40 mg of tomato primrose flowers.
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