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一、烧心开始时心叶叶脉间变褐,以后叶缘细胞逐渐死亡,呈黑褐色。生育前期较少出现,一般主要发生在11～12片叶时。主要是由缺钙引起的。
First, the beginning of heartburn heart leaf between the brown, after the leaf margin cells gradually died, dark brown. Few pre-term emergence, usually occurs mainly in 11 to 12 leaves. Mainly caused by calcium deficiency.