水稻秧苗坐蔸的原因很多。除了过多地施用过磷酸钙造成泥土飘浮，引起坐蔸外，一般都是缺锌或缺钾。根据田间调查分析，近年来施用过硫酸锌的田块，倘若还出现秧苗坐蔸，则是缺钾所致。缺钾秧苗的主要症状是：秧苗老叶尖端和边缘开始发黄，当扩展到叶面中部和茎部时，叶缘... There are many reasons why paddy rice seedlings sit. In addition to excessive use of superphosphate caused soil floating, causing sitting outside, are generally zinc deficiency or potassium deficiency. According to field investigation and analysis, in recent years, the application of zinc sulfate field plots, if there is also the emergence of rice seedling sitting, it is caused by potassium deficiency. The main symptoms of potassium deficiency seedlings are: seedling tip and edge of the old leaves began to yellow, when extended to the middle of the foliage and stems, the leaf margin ...