一、水稻缺锌症状先在下部叶片中脉区出现褪绿黄白化症,上生红褐色斑点和不规则斑块、后逐渐扩大呈红褐色条状,自叶尖向下变红褐色干枯,并自下叶向上叶依次出现。病株出叶速度缓慢,新叶短而窄小,叶色较淡,特别是基部中脉附近褪成黄白色。重病植株叶枕距缩短成错位,明显矮化丛生,很少分蘖,田间常表现参差 First, the symptoms of zinc deficiency in the lower part of the first leaf in the meridian chlorotic yellow albino, raw reddish brown spots and irregular plaques, and then gradually expanded reddish-brown stripes, turned down from the tip of the red-brown dry, and From the lower leaves to the upper leaves appear in turn. Slow strain out of leaves, new leaves short and narrow, lighter leaf color, especially near the base of faded yellow-white. Severe diseased plant leaves from the pillow to shorten the position of dislocation, obviously dwarf tufted, rarely tiller, the field performance often variable