Abstract
Growth efficiency of rice seed germinated under various oxygen conditions was investigated in an attempt to clarify whether respiration of seed coated with calcium peroxide (CaO_2) was aerobic or anaerobic when it was germinated in flooded soil. 1. Growth efficiency varied with oxygen conditions during germination and it declined under anaerobic conditions. 2. When CaO_2-coated seed was germinated in flooded soil, respiration of the seed before seedling emergence was, judging from growth efficiency, fairly anaerobic.
