Long-Term Effects of Organic Amendments on Carbon Stability in Clay–Organic Complex and Its Role in Soil Aggregation
Dhiraj Kumar,
Tapan Jyoti Purakayastha,
Ruma Das,
Rajendra Kumar Yadav,
Yashvir Singh Shivay,
Prakash Kumar Jha,
Surendra Singh,
Kumari Aditi,
P. V. Vara Prasad
Affiliations
Dhiraj Kumar
Division of Soil Science and Agricultural Chemistry, Indian Council of Agricultural Research (ICAR)-Indian Agricultural Research Institute, New Delhi 110012, India
Tapan Jyoti Purakayastha
Division of Soil Science and Agricultural Chemistry, Indian Council of Agricultural Research (ICAR)-Indian Agricultural Research Institute, New Delhi 110012, India
Ruma Das
Division of Soil Science and Agricultural Chemistry, Indian Council of Agricultural Research (ICAR)-Indian Agricultural Research Institute, New Delhi 110012, India
Rajendra Kumar Yadav
Agriculture University, Kota 324001, India
Yashvir Singh Shivay
Division of Agronomy, Indian Council of Agricultural Research (ICAR)-Indian Agricultural Research Institute, New Delhi 110012, India
Prakash Kumar Jha
Feed the Future Innovation Lab for Collaborative Research on Sustainable Intensification, Kansas State University, Manhattan, KS 66506, USA
Surendra Singh
Columbia Basin Agricultural Research Center, Oregon State University, Adams, OR 97810, USA
Kumari Aditi
Feed the Future Innovation Lab for Collaborative Research on Sustainable Intensification, Kansas State University, Manhattan, KS 66506, USA
P. V. Vara Prasad
Feed the Future Innovation Lab for Collaborative Research on Sustainable Intensification, Kansas State University, Manhattan, KS 66506, USA
Clay–organic complexes (COC) impart chemical and physical protection to soil carbon (C). In the present study, the aim was to assess the long-term effects of different organic amendments on C stability in COC, distribution of the aggregates, C concentration in the aggregates and labile organic C fractions in the inceptisols located at the research farm situated in the semi-arid sub-tropical climate of India. The results showed that the COC, the percentage of large macroaggregates (LMA) (>2 mm) and the C associated with the aggregates decreased through the soil depths, whereas the other size fractions of soil aggregates (min), glomalin-related soil protein (GRSP), macroaggregate (MA)-associated C and rice equivalent yield (REY). Overall, the data suggest that the combined application of FYM + GM + BF promotes soil quality under rice–wheat rotation in inceptisols in semi-arid sub-tropical India.
