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Evaluation of long-term conservation agriculture and crop intensification in rice-wheat rotation of Indo-Gangetic Plains of South Asia: Carbon dynamics and productivity

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Title Evaluation of long-term conservation agriculture and crop intensification in rice-wheat rotation of Indo-Gangetic Plains of South Asia: Carbon dynamics and productivity
 
Creator S.K. Samal, K.K. Rao , S.P. Poonia , Rakesh Kumar, J.S. Mishra , Ved Prakash , S. Mondal , S.K. Dwivedi , B.P. Bhatt , Sushant Kumar Naik , Anup Kumar Choubey , V. Kumar , R.K. Malik , Andrew Mc Donald
 
Subject Carbon stock, Carbon fractions, Carbon budgeting, Crop yield, Conservation agriculture
 
Description Not Available
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) re presented 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 sig nificant 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
 
Date 2021-08-16T07:11:22Z
2021-08-16T07:11:22Z
2011-08-20
 
Type Research Paper
 
Identifier Not Available
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/57209
 
Language English
 
Relation Not Available;
 
Publisher Not Available