<![CDATA[Riparian floodplains are dynamic agricultural environments where fluvial processes, hydrology, and soil formation create strong spatial variability in land suitability for irrigated lowland rice. This study evaluated rice suitability in the Kelinjau River floodplain, East Kalimantan, Indonesia, using a geopedological framework linking soil characteristics with geomorphological landforms. Two dominant landforms were identified: permanently waterlogged peaty floodplains and undulating sandy terraces. Land suitability was assessed using the matching approach and maximum limitation principle, integrating CHIRPS rainfall data, DEMNAS-derived terrain attributes, and soil physical and chemical properties from field and laboratory analyses. Results showed that both landforms were classified as marginally suitable (S3) for irrigated rice despite favorable climatic conditions and relatively flat terrain. Low availability of essential macronutrients (N, P, and K) was the primary limiting factor across both landforms. However, the controlling mechanisms differed. In floodplains, prolonged waterlogging and redox conditions reduced nutrient availability, whereas sandy terraces experienced nutrient loss due to coarse texture, shallow effective depth, and high leaching potential. These findings demonstrate that similar suitability classes may result from different landform-specific processes and highlight the importance of geopedological stratification for site-specific soil and nutrient management in tropical riparian rice systems.]]>
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