Sustainability Yield Index of Soybean-Wheat Cropping System as Influenced by Landform and Soil-site Characteristics

An investigation was undertaken to study the influence of landform and other soilsite characteristics on sustainability of soybean-wheat cropping system. The transects were selected to include geomorphic and soil units occurring in toposequence supporting soybeanwheat cropping system. Soil properties, viz., depth, clay content, PAWC, CEC and CaCO₃ were found to increase towards the lower geomorphic positions. Sustainability Yield Index (SYI) was worked out for soybean-wheat in terms of soybean grain equivalent. Soil properties like depth, PAWC, clay content and CEC showed significant and positive correlation whereas coarse fragments showed negative relationship with SYI. Sustainability Yield Index was highest in calcareous Vertisols followed by Vertic Ustochrepts, non-calcareous Vertisols and Lithic Ustochrepts.