Long-term fertilization and manuring with different organics alter stability of carbon in colloidal organo-mineral fraction in soils of varying clay mineralogy.

Autor: Das R; Division of Soil Science and Agricultural Chemistry, ICAR-Indian Agricultural Research Institute, New Delhi 1100 12, Delhi, India. Electronic address: rumadas13@gmail.com., Purakayastha TJ; Division of Soil Science and Agricultural Chemistry, ICAR-Indian Agricultural Research Institute, New Delhi 1100 12, Delhi, India., Das D; Division of Soil Science and Agricultural Chemistry, ICAR-Indian Agricultural Research Institute, New Delhi 1100 12, Delhi, India., Ahmed N; Division of Soil Science and Agricultural Chemistry, ICAR-Indian Agricultural Research Institute, New Delhi 1100 12, Delhi, India., Kumar R; Division of Soil Science and Agricultural Chemistry, ICAR-Indian Agricultural Research Institute, New Delhi 1100 12, Delhi, India., Biswas S; Division of Soil Science and Agricultural Chemistry, ICAR-Indian Agricultural Research Institute, New Delhi 1100 12, Delhi, India., Walia SS; Department of Agronomy, Punjab Agricultural University, Ludhiana 141004, Punjab, India., Singh R; Department of Agronomy, GB Pant University of Agriculture and Technology, Pantnagar 263145, Uttarakhand, India., Shukla VK; Department of Agronomy, Jawaharlal Nehru Krishi Viswa Vidyalaya, Jabalpur 482004, Madhya Pradesh, India., Yadava MS; Department of Agronomy, Birsa Agricultural University, Ranchi 834006, Jharkhand, India., Ravisankar N; Division of Integrated Farming System Management, ICAR-Indian Institute of Farming Systems Research, Modipuram 250110, Uttar Pradesh, India., Datta SC; Division of Soil Science and Agricultural Chemistry, ICAR-Indian Agricultural Research Institute, New Delhi 1100 12, Delhi, India.
Jazyk: angličtina
Zdroj: The Science of the total environment [Sci Total Environ] 2019 Sep 20; Vol. 684, pp. 682-693. Date of Electronic Publication: 2019 May 23.
DOI: 10.1016/j.scitotenv.2019.05.327
Abstrakt: Majority of organic matter is bound to clay minerals to form stable colloidal organo-mineral fraction (COMF) in soil. Stability of carbon (C) in COMF is crucial for long-term C sequestration in soil. However, information on the effect of long-term fertilization and manuring with various organic sources on C stability in such fraction in soils with varying clay mineralogy is scarce. The present study was, therefore, carried out to assess the effect of thirty-one years of continuous fertilization and manuring with different organics on C-stability in COMF extracted from an Inceptisol, a Vertisol, a Mollisol, and an Alfisol. The treatments comprised of control (no fertilization), 100% NPK (100% of recommended N, P and K through fertilizer), 50% NPK+ 50% of recommended N supplied through either farm yard manure (FYM) or cereal residue (CR) or green manure (GM). The stability of C (1/k) in COMF was determined from desorption rate constant (k) of humus-C by sequential extraction and correlated with extractable amorphous Fe-Al-Si-oxides, and crystallite size of illite minerals. Long-term fertilization and manuring with the above sources of organic altered the contents of amorphous Fe-Al-Si-oxides, and decreased the crystallite size of illite in all the soil orders. Fifty percent substitution of fertilizer N by various organics significantly increased C-stability in COMF by 27-221% (mean 111%) over full dose of NPK (100% NPK). Smectite dominating Vertisol exhibited highest stability of C followed by the Mollisol, the Inceptisol and the Alfisol. Stability of such C in soil was correlated positively with the amount of amorphous Fe and Al oxides but negatively with crystallite size of illite (r = -0.46, P < 0.01). Application of NPK + GM or NPK + FYM in Inceptisol, Vertisol and Mollisol and NPK + GM or NPK + CR in Alfisol emerged as the best management practices for higher stabilization of C in COMF for long-term C sequestration.
(Copyright © 2019 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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