江苏自１９９２年引进水稻肥床旱育稀植，至１９９７年全省推广面积已超过 ５０％，表现省水、省种、省工、省肥、增产等特点，增产达１０％以上。但生产中常遇到恶苗病加重和黄（白）化病、立枯病造成弱苗或死苗。针对这一问题，我们经多年调查实践，找出了发病原因并摸索出一 Since 1992, Jiangsu introduced dry land for cultivation and cultivation of paddy soils, and by 1997, the total area for its promotion in the province was over 50%. Its performance of saving water, saving provincial, provincial workers, provincial fertilizers and increasing output increased more than 10%. However, production often encountered aggravating sickness and yellow (white) disease, blight caused by weak or dead seedlings. In response to this problem, after years of investigation and practice, we found out the cause of the disease and found out one