Development of unique soil organic carbon stability index under influence of integrated nutrient management in four major soil orders of India.

Autor: Yadav RK; AICRP on Irrigation Water Management, Agricultural Research Station, Umeedganj, Agriculture University, Kota, 324001, Rajasthan, India., Purakayastha TJ; Division of Soil Science and Agricultural Chemistry, ICAR-Indian Agricultural Research Institute, New Delhi, 110012, India. Electronic address: tpurakayastha@gmail.com., Bhaduri D; Crop Production Division, ICAR-National Rice Research Institute, Cuttack, 753006, Odisha, India., Das R; ICAR-NBSS & LUP, Regional Centre, Kolkata, 700091, West Bengal, India., Dey S; Division of Soil Science and Agricultural Chemistry, ICAR-Indian Agricultural Research Institute, New Delhi, 110012, India., Sukumaran S; ICAR-Central Research Institute for Dryland Agriculture, Hyderabad, 500059, Telangana, 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.
Jazyk: angličtina
Zdroj: Journal of environmental management [J Environ Manage] 2024 Jun; Vol. 360, pp. 121208. Date of Electronic Publication: 2024 May 23.
DOI: 10.1016/j.jenvman.2024.121208
Abstrakt: Stability of soil organic carbon (SOC) is pre-requisite for stabilization of C leading to long-term C sequestration. However, development of a comprehensive metric of SOC stability is a major challenge. The objectives for the study were to develop novel SOC stability indices by encompassing physical, chemical, and biochemical SOC stability parameters and identifying the most important indicators from a Mollisol, an Inceptisol, a Vertisol, and an Alfisol under long-term manuring and fertilization. The treatments were control, 100%NPK, 50% NPK+ 50% N through either farmyard manure, cereal residue, or green manure. SOC stability indicators were selected, transformed and integrated into unique SOC stability indices via conceptual framework and principal component analysis. Principal component analysis identified Al-macroaggregate, humic acid C-microaggregate, microaggregate-C, particulate organic matter-C-macroaggregate and polyphenol-microaggregate as the important SOC stability indicators. The principal component analysis -based SOC stability index varied from 0.2 to 0.9, 0.1 to 0.5, 0.2 to 0.6, 0.1 to 0.5 for Mollisol, Inceptisol, Vertisol and Alfisol, respectively. The SOC-stability index derived from conceptual framework and principal component analysis significantly lined up well with one another, although NaOCl-Res-C showed a high correlation with both conceptual framework (r = 0.8) and principal component analysis-based (r = 0.7) SOC stability indexes, suggesting that both methods might be used to quickly assess SOC stability in four soil orders. Overall, 50%NPK+50%N by farmyard manure or green manure emerged as the most effective management practices for enhancing stability of SOC in Mollisol, Inceptisol, Vertisol, and Alfisol of India which might act as major C sink in rice-wheat and maize-wheat cropping systems. The other aspect of C sequestration is to enhance agricultural productivity without depending much on expensive chemical fertilizers. The model yardstick thus developed for assessing SOC stability might be useful to other systems as well.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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