Evaluation of long-term conservation agriculture and crop intensification in rice-wheat rotation of Indo-Gangetic Plains of South Asia: Carbon dynamics and productivity
| Autor: | S K, Samal, K K, Rao, S P, Poonia, Rakesh, Kumar, J S, Mishra, Ved, Prakash, S, Mondal, S K, Dwivedi, B P, Bhatt, Sushanta Kumar, Naik, Anup Kumar, Choubey, V, Kumar, R K, Malik, Andrew, Mc Donald |
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| Rok vydání: | 2017 |
| Předmět: |
OC
organic carbon Conservation agriculture NT no tillage CT conventional tillage MBC microbial biomass carbon complex mixtures Article RWCS rice wheat cropping system S4 scenario 4 Carbon budgeting CA conservation agriculture CMI carbon management index FDA flouroscein di acetate activity Carbon stock Crop yield IGP Indo Gangetic plains fungi food and beverages C stock carbon stock DHA dehydrogenase activity Carbon fractions SOC soil organic carbon S3 scenario 1 AlkP alkaline phosphatase activity S1 scenario 1 S2 scenario 2 TOC total organic carbon |
| Zdroj: | European Journal of Agronomy |
| ISSN: | 1161-0301 |
| Popis: | Highlights • Conservation agriculture (CA) practice meaningfully stabilized organic carbon (OC) upto lower depth of soil. • Crop intensification with nutrient exhaustive crops lowers OC stabilization in soil even after adoption of CA practice. • Farmers practice of growing rice and wheat produce less yield with less storage of carbon in soil. • Rice-wheat-legume crop with CA proved as most efficient in terms of crop yield, soil health and carbon sequestration. In the context of deteriorating soil health, stagnation of yield in rice-wheat cropping system (RWCS) across Indo- Gangetic plains (IGP) and environmental pollution, a long term field experiment was conducted during 2009–2016 taking four crop scenarios with conservation agriculture (CA), crop intensification and diversified cropping as intervening technology aiming to evaluate the sustainability of the systems. Scenario 1 (S1) represented conventional farmers’ practice of growing rice and wheat with summer fallow. In scenario 2 (S2) and scenario 3 (S3), legume crop was taken along with rice and wheat with partial CA and full CA, respectively. Conventional RWCS was replaced with rice-potato + maize- cowpea cropping system with partial CA in scenario 4 (S4). The S3 scenario registered highest total organic carbon (TOC) stock of 47.71 Mg C ha−1 and resulted in significant increase of 14.57% over S1 (Farmer’s practice) in 0–30 cm soil depth after 7 years of field trial. The S4 scenario having intensified cropping systems recorded lowest TOC of 39.33 Mg C ha−1 and resulted in significant depletion of 17.56% in C stock with respect to S3 in 0–30 cm soil depth. The TOC enrichment was higher in S2, S3 and S4 scenario in the surface soil (0–10 cm) compared to S1. At lower depth (20–30 cm), the TOC enrichment was significantly higher in S2 (12.82 Mg C ha−1) and S3 (13.10 Mg C ha−1 soil) over S1 scenario. The S2 and S3 scenario recorded highest increased allocation of TOC (3.55 and 6.13 Mg C ha−1) to passive pool over S1. The S2 (15.72 t ha−1), S3 (16.08 t ha−1) and S4 (16.39 t ha−1) scenarios recorded significantly higher system rice equivalent yield over S1 (10.30 t ha−1). Among the scenarios, S3 scenario had greater amount of total soil organic carbon, passive pool of carbon and higher system rice equivalent yield, thus, is considered the best cropping management practice to maintain soil health and food security in the middle IGP. |
| Databáze: | OpenAIRE |
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