花卉缺素在叶片上有哪些表现
当花卉体内缺乏某种元素时,它可通过叶片表现出来。
缺磷 叶片呈暗绿色、蓝色,下部叶脉间黄化,有深色小斑,且常带有紫色,叶易脱落。
缺氮 叶片色泽变淡且无光泽,新梢叶片变小,生长缓慢,叶易脱落。
缺镁 老叶主脉间明显失绿,并逐渐延至顶梢新叶上,在叶脉上出现黄色条斑状,叶片变薄、叶肉变淡,叶脉、叶尖和叶基部仍为绿色。
缺钾 下部老叶边缘呈褐色,出现坏死斑点,枝干纤细柔弱,叶片易脱落。
缺铁 缺铁的症状与缺镁相似,但其是从顶部新叶开始变化。叶脉间呈黄色或黄白色,仅叶脉为绿色,继而发展成整个叶片黄色,并向下部老叶蔓延。
缺锌 老叶除叶脉及其附近为绿色外,叶肉及叶脉间黄化,新叶变小、变硬,簇生。
缺锰 叶脉间失绿黄化,并逐渐形成条纹,只有叶脉及叶脉附近仍为绿色,新叶可出现黑褐斑,花小且花色不佳。
缺钙 顶梢新叶的叶尖及边缘易受伤、枯死,叶缘向上卷曲枯焦,新叶叶尖常弯曲呈钩状。
缺硫 新叶色泽变淡,甚至发白,叶脉色泽更淡,叶片细长,并易向下部老叶蔓延。
缺铜 叶尖发白,叶脉间出现白色斑点,新叶萎缩,形状畸形。
缺硼 新叶色泽变淡失绿,叶片肥厚皱缩,叶缘向上卷曲。
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