Influence of 36 years of integrated nutrient management on soil carbon sequestration, environmental footprint and agronomic productivity of wheat under rice-wheat cropping system

Frontiers in Environmental Science

Environmental Science

Sanjay Kumar¹  Swaraj Kumar Dutta¹  Sumit Sow²  Shivani Ranjan²  Dhirendra Kumar Roy³  Vikram Bharati³  Dibyajyoti Nath⁴  Kirttiranjan Baral⁵  Parmeswar Dayal⁵  Smruti Ranjan Padhan⁵ 

[1] Department of Agronomy, Bihar Agricultural University, Bhagalpur, Bihar, India;Department of Agronomy, Bihar Agricultural University, Bhagalpur, Bihar, India;Department of Agronomy, Dr. Rajendra Prasad Central Agricultural University, Samastipur, Bihar, India;Department of Agronomy, Dr. Rajendra Prasad Central Agricultural University, Samastipur, Bihar, India;Department of Soil Science, Dr. Rajendra Prasad Central Agricultural University, Samastipur, Bihar, India;Division of Agronomy, ICAR-Indian Agricultural Research Institute, New Delhi, India;

关键词: carbon pool index;    FYM;    GHG emission intensity;    SOC sequestration;    wheat;   

DOI  :  10.3389/fenvs.2023.1222909

 received in 2023-05-15, accepted in 2023-08-30,  发布年份 2023

来源: Frontiers

【 摘 要 】

A long-term field experiment was conducted to study the effects of different combinations of integrated nutrient management (INM) on carbon sequestration and wheat yield in a rice-wheat cropping system. The experiment consisted of 11 treatments that were replicated three times. The organic manures used in the study included farmyard manure (FYM), wheat straw (WS), and green manure (GM) with Sesbania aculeata. The results of the experiment revealed that the application of 50% of the recommended dose of fertilizers (RDF) along with 50% nitrogen (N) through FYM during rice cultivation, and RDF during wheat cultivation, led to a significant increase in soil organic carbon (SOC). Specifically, the SOC content was enhanced by 46.4% (18.29 Mg ha-1) compared to RDF in rice and wheat, resulting in a C sequestration rate of 0.22 Mg ha-1 year-1. These increases were higher in treatments that combined organic and inorganic inputs. Additionally, the application of 50% RDF and substituting 50% of the nitrogen with FYM during wheat cultivation resulted in a 24.7% increase in grain yield compared to RDF in rice and wheat. The INM treatments, showed significantly (p ≤ 0.05) higher agronomic efficiency (AE) of nitrogen (N), phosphorus (P) and potassium (K), partial factor productivity (PFP) of N, P and K, and carbon pool index (CPI) compared to the application of inorganic fertilizers at the recommended dose. Moreover, the INM treatments also exhibited lower greenhouse gas (GHG) emission intensity. Application of neither chemical fertilizers nor organic manure (T1) resulted in maximum GHG emission intensity (328.1 kg CO2 eq Mg−1 yield). Based on these findings, it can be concluded that the combined use of inorganic fertilizers and organic manures significantly increased crop yield and soil organic carbon sequestration while reducing GHG emissions in a rice-wheat cropping system in the eastern Indo-Gangetic Plains (EIGP) of India.

【 授权许可】

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Copyright © 2023 Ranjan, Kumar, Dutta, Padhan, Dayal, Sow, Roy, Nath, Baral and Bharati.