Abstract
This study was conducted to clarify the cause of growth inhibition of rice cultivar for whole crop silage 'Hyogoushiwakamaru' in Awaji region (the southern part of Hyogo prefecture) in 2007. The genetic natures of 'Hyogoushiwakamaru' and the breeding lines were investigated. As a result, being ruled by single inferiority gene became clear as for the sensitivity to paddy herbicide, Benzobicyclon. This sensitivity was derived from indica-type high-yielding rice cultizar 'Tokusei' breeded by Guangdong province in China.
