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It’s known that Manganese (Mn) is toxic when its concentration goes beyond a critical limit of 23ppm in plants. In Assam soil, available Mn concentration is 3-52ppm. There is paucity of information how the excess Mn brings about biochemical changes in upland rice crop grown in acid soil condition of Assam. A dose response study of Mn (0, 10,20,30 ppm Mn as MnSO4H2O) on ten upland rice genotypes (Kanaklata, Mulagabharu, Kapilee, Disang, Kolong, Joymoti, Jyoti Prasad, Luit, Lachit and Chilarai) was accomplished applying Mn as foliar spray (each 1000cm 3 ) through panicle initiation to heading stage (60-70 days after sowing:DAS). At lower dose of Mn treatment, there were higher increments in total Chlorophyll (27.17%), Chlorophylla (26.72%) and Chlorophyll-b (27.77%), NR activity (35.39%), Carbohydrate content in grain (9.04%), and Cell membrane stability (37.06%). The highest dose of Mn treatment (30ppm) reduced all these physiological attributes in the study. However, Mn content in shoots (87%) and grain (87.9%), distribution of Mn contents in intercellular (84.21%), exchangeable locations (74.84%) increased significantly by 30ppm Mn treatment. Based on the overall, Kanaklata followed by Chilarai was superior in terms of the biochemical traits deviated by Mn treatments in the present studies.

Effects of Manganese on Some Biochemical Indices of Rice (Oryza sativa L.) Crop in Acid Soil Condition