Differential responses of soil organic carbon fractions to tillage and nutrient management under rice based cropping systems
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Authors
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Akash V. Deshmukh
Assistant professor, Department of soil science and agril. chemistry, School of Agricultural Sciences, G H Raisoni university, MP
https://orcid.org/0009-0005-1163-613X
Keywords:
Soil organic carbon , tillage, INM, Rice based cropping systems, Legumes, Nutrient management , SOC fractionsAbstract
This study evaluated the impact of tillage and nutrient management on soil organic carbon (SOC) fractions in rice-based cropping systems. A two-year field investigation (2020-2022) in Sakoli, Maharashtra, analysed surface soil (0-15 cm) for readily oxidizable (ROC), hot water extractable carbon (HWEC), cold water extractable carbon (CWEC), and acid hydrolysable (AHC) carbon. Six rice-based cropping systems, two tillage practices (conventional, mechanized), and two nutrient management strategies (Integrated Nutrient Management (INM), chemical fertilizers) were compared. Results showed the rice-chickpea system consistently had the highest ROC, HWEC, CWEC, and AHC, due to enhanced nitrogen fixation and biomass. INM significantly increased all active carbon fractions over chemical fertilizers, demonstrating organic input benefits. The continuous rice-rice system recorded the lowest values. Tillage practices did not significantly influence these fractions. This research concludes that, integrating leguminous crops and adopting INM are critical for augmenting active soil carbon fractions, enhancing soil quality in rice based cropping systems.
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