Eggplants cultivated in summer often have a phenomenon in which the top (umbilical) is split, the seeds are exposed, and the fruit is no longer inflated. Serious plots of up to 1 / 4 occur , seriously affecting the yield and commodity value.
The cracking of the top of the cigar is mainly caused by calcium deficiency. The calcium deficiency is mainly caused by calcium deficiency in the soil, heavy rain leaching, excessive nitrogen fertilizer, excessive air humidity and serious diseases. In the early stage of fruit development, the soil was dry, causing the skin to be lignified. In the later stage, when the rain or uneven watering was uneven, the inside of the fruit rapidly expanded, and the peel could not grow correspondingly and crack. However, most of the eggplant top cracking occurs because the plant lacks calcium. The causes and prevention measures of calcium deficiency are as follows:
First, the cause of calcium deficiency
　　 1. Lack of calcium fertilizer. Calcium deficiency in the soil, especially for continuous crops, does not pay attention to the application of calcium fertilizer, resulting in calcium deficiency. This phenomenon is more prominent in greenhouses and greenhouses.
　　 2. Too much nitrogen. Excessive application of nitrogen fertilizer in the soil causes excessive accumulation of ammonium nitrogen and inhibits the absorption of calcium.
　　 3. Excess water. Excessive watering or leaching of heavy rain, the loss of effective calcium in the soil, resulting in calcium deficiency. It is severe when it is rainy in summer.
　　 4. Growth disorders. That is, the poor water circulation in the plant causes an obstacle to growth. This phenomenon is divided into two situations: first, the soil is dry, the plant lacks water supply, and calcium cannot be absorbed; second, after heavy rain or watering in summer, the air humidity is extremely high, which inhibits the transpiration of the plant, and the root system cannot Normal absorption of water and calcium, resulting in calcium deficiency.
　　 5. Pest and disease hazards. In the later stage of growth, due to management negligence, serious pests and diseases, especially those with verticillium wilt, blight, root rot, root knot nematode, disease, and excessive results, aging of plants, etc., the absorption function of roots is greatly reduced. Causes calcium deficiency.
Second, prevention and treatment of cracking measures
　　 1. Add calcium fertilizer. Pay attention to the application of calcium fertilizer with higher calcium content in fertilization.
　　 2. Proper watering. Watering in a timely manner during drought, but not too much. Drain the rainy days in time to prevent flooding.
　　 3. Strengthen management. In addition to good pest control, spray natural buckwheat and Shuofeng 481 solution twice every 20 days to promote root growth and improve absorption capacity.
　　 4. Fertilization outside the roots. Air humidity during the rainy season, every 3 - 7 Days for foliage spray with 0.3% solution of calcium and magnesium ammonium 1 times.
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