稻缩苗又称“红苗”。主要表现在水稻返青以后,稻苗出现黑根子、黄尖子、独杆子。地下部稻根瘦弱发黑,地上部叶片卷缩直立呈筒状,叶尖枯黄,远看稻苗略成红色,生长非常缓慢,很少扩权。据插秧后四十天调查,正常稻苗单株于根重0.067克,稻缩苗单株干根重只有0.037克。正常稻苗株高38厘米,稻缩苗只有24.8厘米。黄尖叶片数,正常稻苗为23％,稻缩 Rice shrinkage, also known as “red seedlings.” Mainly after the greening of rice, black seedlings appear seedlings, yellow apex, single pole. Underground roots thin and black, above ground leaves curled upright tubular, tip yellowish, far looks rice seedlings slightly red, growth is very slow, very few expansion. According to forty days after transplanting investigation, the normal seedling plant root weight 0.067 grams, rice seedling root dry weight per plant only 0.037 grams. The normal rice plant height 38 cm, rice shrinkage only 24.8 cm. Yellow tip leaves number, normal rice seedlings is 23%, rice shrinkage