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Organic Carbon Fractions, Aggregate Stability, and Available Nutrients in Soil and Their Interrelationships in Tropical Cropping Systems: A Case Study

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Abstract

Tropical agricultural soils have been claimed as a source of carbon. As agricultural systems in the tropics are highly diverse, it is useful to study soil organic C (SOC) of different agricultural systems. We quantified the SOC fractions, available nutrients, and aggregate stability in eight different tropical agricultural systems, including annual crops under different management scenarios, such as organic, inorganic, and combined fertilizer applications. Annual crops treated with organic fertilizer only (A–OF), inorganic fertilizer only (A–IF), both organic and inorganic fertilizers (A–O/IF), perennial crops (PC), home gardens (HG), and abandoned home gardens (AHG) in Eutrustox soils and annual crops with organic fertilizer only (A–OFS) and uncultivated land on Quartzipsamments soil (USR) were studied. The links between SOC fractions, available nutrients, and aggregate stability in these soils were analyzed. Regression models were fitted for SOC fractions and available nutrients. Our results indicated that the different land use types exhibited significant variations in organic carbon fractions, aggregate stability, and available nutrients in soils. The available macro and micronutrients, except for nitrogen, showed a significant positive correlation with either total organic C (TOC) or carbon fractions indicating the synergy between them. The differences in soil C stocks clearly reflected the differences in litter fall and soil disturbance, as indicated by the highest C stocks in AHG. The dry weight of collected litter showed that AHG accumulated the highest litter content (97.38 g/m2) compared to the lowest (37.63 g/m2) in A–I/F. Organic matter addition to soil also increased the C stocks, even in annual crops. Aggregate stability showed a positive correlation with C fractions. The regression models developed in this study can be used to predict available nutrients by measuring TOC or C fractions in similar land use types in the tropics. This study confirmed that tropical agricultural systems that include annual crops have potential for storing and maintaining C in soils, if appropriately managed. The beneficial influence of SOC on available nutrients and aggregate stability could be a driving force to increase carbon stock in tropical agricultural systems.

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ACKNOWLEDGMENTS

The authors wish to thank Mr. Anura Pathirana and Ms. Kumuduni Karunaratne, National Institute of Fundamental Studies, Kandy for assistance in sampling and chemical analysis.

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Ratnayake, R.R., Roshanthan, T., Gnanavelrajah, N. et al. Organic Carbon Fractions, Aggregate Stability, and Available Nutrients in Soil and Their Interrelationships in Tropical Cropping Systems: A Case Study. Eurasian Soil Sc. 52, 1542–1554 (2019). https://doi.org/10.1134/S1064229319120123

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