水稻缺钙症状首先出现在新根、幼叶、生长点等分生组织,造成生长减弱,植株生长严重受阻,新叶黄化焦枯,生长点枯死;根尖坏死,根系发育不良,呈黄褐色,缺乏生机。缺钙诊断缺钙与缺硼的某些症状相似,如都有生长点、顶芽与根尖枯萎死亡,嫩芽与新叶扭曲、变形等,容易混淆,需注意辨别。但缺硼叶片及叶柄变厚、变粗、变脆,内部常产生褐 The symptoms of calcium deficiency in rice first appeared in new roots, young leaves, growth points and other meristematic tissues, resulting in weakened growth, severely impaired plant growth, new leaf yellowing scorched, growing point dead; apical necrosis, poor root growth, yellowish brown , Lack of vitality. Calcium deficiency diagnosis of calcium and boron deficiency of some of the symptoms are similar, such as growth points have been the top bud and root tip wilt death, buds and new leaves twisted, deformed, easy to confuse, should pay attention to distinguish. However, lack of boron leaves and petiole thickening, thicker, brittle, the internal often produce brown