Technical assessment of organic rice culture

有机大米文化(ORC)受到那些担心食品和生态系统恶化的人的密切关注。为了从作物科学的角度评价ORC，1991~1993年进行了田间试验。试验区ORC的产量显著低于对照。增施化肥的小区产量与对照小区相当。病虫害对非农药小区的危害非常轻微，但病虫害的发生年际间有较大差异。在不施除草剂的地块，由于穗数减少，杂草严重减产。建议冬小麦高产稳产不仅要靠田间有机质的投入，还要配施化肥和农药。

The organic rice culture (ORC) is watched with keen interest by those who fear deteriorations in foods and ecosystems. To assess the ORC from the view point of crop science, the field experiments were conducted from 1991 to 1993.The yielding ability of the ORC in the experimental plots was significantly lower than that of the control plot. The yields of plots supplemented with chemical fertilizer were equal to that of the control plot. The damage caused by pest and disease in the non-pesticide plots was remarkably slight, but it should be noted that the occurrence of pest and disease varies considerably from year to year. The yield was seriously decreased by weed in the plots to which no herbicide was applied, due to the decrease in the number of panicles. It is suggested that not only input of organic matter to the field but also supplementary applications of chemical fertilizer and pesticide are necessary for high and stable production of ORC.