近年来营口地区水田,由于增施氮、磷肥,促进了水稻产量的提高,但土壤中微量元素锌,则感到不足,因而在插秧后半个月左右即出现缺锌缩苗现象。其症状:首先是秧苗滞长矮化,稻株基部叶片干尖发枯,接着叶片中段出现褐色不规则斑点,从老叶向上部叶片扩展,随后叶脉变白,心叶呈现白筋,有的叫做“白茎缩 In recent years, paddy fields in Yingkou have increased the yield of rice due to the increase of nitrogen and phosphate fertilizer, but the deficiency of trace element zinc in soil is not enough, so the phenomenon of zinc deficiency and shrinkage appears in about half a month after transplanting. Symptoms: The first is the stagnant growth of seedlings, dry leaves at the base of the rice plant withered hair, followed by brown irregular spots in the middle leaves, leaves from the old leaves to the upper expansion, followed by white veins, heart leaves appear white tendons, and some Called ”white stem shrinkage