玉米对锌最敏感。所以一旦缺锌就会出现叶绿素减少，叶片失绿变薄，节间缩短，叶窄株矮等现象。严重时植株节间变短矮缩，根部变黑。叶片短而阔、簇生，叶肉增厚，较正常植株生长缓慢，故称之为僵苗。玉米发生僵苗后，苗期生长势弱，生长缓慢，生育进程推迟。一般僵苗植株株高? Corn is the most sensitive to zinc. So once the lack of zinc will appear chlorophyll reduction, green leaf thinning, internodes shortened, narrow leaves and other short leaves phenomenon. In severe plant internodes become short and shortening, the roots darken. Short and broad leaves, tufted, mesophyll thicker than normal plant growth is slow, it is called stiff seedlings. Post emergence of stiff seedlings of corn, seedling growth is weak, slow growth, delayed fertility. General stiff seedling plant height?