僵苗又称发僵、坐蔸,是水稻分蘖期出现的各种生理病害的总称。目前推广的免耕抛秧技术在实践中也遇到了僵苗问题,其症状主要表现为抛秧立苗后,秧苗植株矮小、不分蘖、叶片短窄、变形、失绿等,从而造成后期穗小、粒少而减产。一般减产20%～30%,严重的达50%以上。为此,笔者结合生 Stiff spherulina, also known as stiff, sitting 蔸, is a general term for various physiological diseases occurring at the tillering stage of rice. The current promotion of no-tillage throwing seedling technology in practice also encountered a stiff seedling problem, the main symptoms of throwing seedlings standing seedlings, plantlets short, not tillers, short leaves, deformation, loss of green, etc., resulting in late panicles Small, fewer grains and cut. The general reduction of 20% to 30%, a serious up to 50% or more. To this end, I combine students