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目前用于生产的杂交水稻种子,农民反映杂种一代中徒长苗发生严重。据初步调查,1988年湖南、广西、江西、贵州、湖北等省的杂交早稻发病均较严重,秧苗发病率一般为15～20%,严重的高达30%以上,本田发病率为10～15%,高者可达25%以上。为了弄清这种徒长苗的发生原因,在袁隆平教授的指导下,本人进行了一些调查研究,具体情况如下。一、基层调查记要 1.湖南黔阳县的双溪、江市、岔头、雪峰等乡播种的威优48品种,大部分秧苗发病率在20%以
The hybrid rice seeds currently used for production reflect the serious occurrence of acrophobia in the hybrid generation. According to the preliminary investigation, in 1988, the incidence of early hybrid rice in Hunan, Guangxi, Jiangxi, Guizhou and Hubei provinces was more serious. The incidence rate of seedling was 15-20%, serious as high as 30%, and the incidence of Honda was 10-15% , The highest up to 25% or more. In order to clarify the reasons for the occurrence of this kind of apprentice, under the guidance of Professor Yuan Longping, I conducted some investigations and studies as follows. First, the grass-roots survey records to 1. Guizhou Qianyang County Sungai, Jiang, Chaotou, Xuefeng and other townships sowing Weiyou 48 varieties, most of the incidence of seedlings in 20%