Abstract
The impact of cropping systems on soil aggregation and associated carbon (C) and nitrogen (N) stabilization in relation to soil’s antecedent C level has not been well addressed, which is essential for prioritization of agricultural soils for C and N sequestration. In this background, the present study investigated the influence of maize-wheat (MW) and soybean-wheat (SW) cropping systems and continuous fallow (CF) on soil aggregation and associated C and N storage in four soils of same type and texture (sandy loam textured Typic Ustorthents) but different antecedent C levels: a low-C soil (Soil 1, 5.6 g C kg–1), two medium-C soils (Soil 2, 9.0 g C kg–1 and Soil 3, 9.6 g C kg–1) and a high-C soil (Soil 4, 12.9 g C kg–1). While in low-C soil, MW outperformed the SW in increasing aggregate mean weight diameter (MWD) by 13% and C and N preservation capacities of macroaggregate fractions by 5–52%; in medium-C soils, the opposite occurred where SW showed 4–9% increased MWD and 8–76% increased C and N preservation capacity over MW. Contrarily in high-C soil, the two cropping systems behaved similarly; these decreased the aggregate MWD by 6–10% and the macroaggregate-preserved C and N by 8–39% compared to the CF. Changes in macroaggregate C and N storage were significantly related to bulk soil C and N levels (R2 = 0.65–0.85, p < 0.05). Conclusively, the selection of cropping systems to improve aggregate C and N storage must preconsider the antecedent soil C level; because the magnitude and direction of cropping impacts on C and N storage depend on soil’s antecedent C level. For a greater physical stabilization of sequestered C and N, in the Entisols of northwest India, MW and SW may be promoted to low- and medium-C soils, respectively.
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This research was supported by the Indian Council of Agricultural Research (ICAR) National Professor project.
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Samrat Ghosh: sampling and laboratory analyses, data analysis, preparation of draft and final manuscript; Dinesh Kumar Benbi: conceptualizing and designing the study, conduct of field experiment, supervising and facilitating laboratory analysis, editing the manuscript.
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Ghosh, S., Benbi, D.K. Impacts of Cropping Systems on Soil Aggregates and Associated Carbon and Nitrogen Storage in Four Entisols of Different Antecedent Carbon Levels. Eurasian Soil Sc. 56, 371–386 (2023). https://doi.org/10.1134/S1064229322601524
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DOI: https://doi.org/10.1134/S1064229322601524