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早稻秧田一般都选择避风向阳、土质疏松肥沃、灌排条件好、管理方便的稻田。这些稻田因长期连作,土壤中绵腐菌、腐霉菌等病菌逐年累积,残留量大;加之秧田消毒没有跟上,导致早稻秧苗绵腐病、立枯病扩展蔓延,烂秧程度加大。据调查:老秧田绵腐病、立枯病的发病株率高达44.5％,而同等条件下的新秧田发病率只有2.3％。
Early rice seedling generally choose to shelter the sun, loose and fertile soil, irrigation and drainage conditions are good, convenient management of rice fields. Due to long-term continuous cropping, the soil of cotton moth rot, Pythium and other germs accumulate year after year, and the residue is large. In addition, the disinfection of seedling did not keep up, leading to the rot of early rice seedlings and the spread of blight spread. According to the survey, the incidence of blight on old seedling and blight incidence was as high as 44.5%, while the incidence of new seedling under the same conditions was only 2.3%.