Assessment of long-term Site-Specific Nutrient Management (SSNM) on soil organic carbon dynamics and sequestration in a rice-rice cropping system

A Chitra Devi; S Maragatham; K Sathiyabama; D Balachandar; V Davamani; M Gopalakrishnan; R Rajeswari; P Malathi

doi:10.14719/pst.5582

Authors

A Chitra Devi Department of Soil Science and Agricultural Chemistry, Tamil Nadu Agricultural University, Coimbatore, Tamilnadu, India-641003 https://orcid.org/0009-0008-0334-4606
S Maragatham Department of Soil Science and Agricultural Chemistry, Tamil Nadu Agricultural University, Coimbatore, Tamilnadu, India-641003 https://orcid.org/0000-0002-5787-2390
K Sathiyabama Department of Soil Science and Agricultural Chemistry, Tamil Nadu Agricultural University, Coimbatore, Tamilnadu, India-641003 https://orcid.org/0000-0002-8974-9119
D Balachandar Department of Agricultural Microbiology, Tamil Nadu Agricultural University, Coimbatore, Tamilnadu, India-641003 https://orcid.org/0000-0002-4434-6316
V Davamani Department of Environmental Sciences, Tamil Nadu Agricultural University, Coimbatore, Tamilnadu, India-641003 https://orcid.org/0000-0001-6969-2584
M Gopalakrishnan Department of Soil Science and Agricultural Chemistry, Tamil Nadu Agricultural University, Coimbatore, Tamilnadu, India-641003 https://orcid.org/0000-0003-3107-8989
R Rajeswari Department of Soil Science and Agricultural Chemistry, Tamil Nadu Agricultural University, Coimbatore, Tamilnadu, India-641003 https://orcid.org/0000-0001-7016-1027
P Malathi Department of Soil Science and Agricultural Chemistry, Tamil Nadu Agricultural University, Coimbatore, Tamilnadu, India-641003 https://orcid.org/0000-0002-6885-9618

DOI:

https://doi.org/10.14719/pst.5582

Keywords:

active pools, carbon stock, organic carbon pools, passive pools, SSNM-IPNS

Abstract

This study examined the long-term effects of the Site-Specific Nutrient Management Integrated Plant Nutrient System (SSNM-IPNS) on carbon sequestration, stock, loss and mineralization in soil within a 26-year-old ricerice cropping system at wetland of Tamil Nadu Agricultural University, Coimbatore. The research focused on the impact of integrated organic and inorganic nutrient application on carbon fractions compared to conventional fertilization methods under wetland ecosystems. Results indicated that the SSNM-IPNS approach significantly enhances soil total organic carbon (TOC), with levels reaching 1.56% compared to just 0.78% in control treatments. Furthermore, labile carbon fractions such as permanganate-oxidizable carbon (POx-C), microbial biomass carbon (MBC), water-soluble carbon (WSC), and particulate organic carbon (POC) were found to be greater in the SSNM-IPNS management. Increased rates of carbon mineralization and basal respiration also reflected a more active and efficient microbial community in these soils. Soil microbial indices, including the microbial quotient (qMic) and the metabolic quotient (qCO2), further emphasized the benefits of the SSNM-IPNS approach in enhancing soil health. Overall, the findings demonstrate that SSNM -IPNS significantly improves carbon sequestration, nutrient cycling, and soil fertility, promoting sustainable agricultural practices vital for long-term productivity in intensive cropping systems. This research underscores the importance of adopting innovative nutrient management practices for sustainable agriculture.

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