World Journal of Agricultural Research
ISSN (Print): 2333-0643 ISSN (Online): 2333-0678 Website: http://www.sciepub.com/journal/wjar Editor-in-chief: Rener Luciano de Souza Ferraz
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World Journal of Agricultural Research. 2014, 2(6A), 1-5
DOI: 10.12691/wjar-2-6A-1
Open AccessResearch Article

Soil Organic Carbon Sequestration in Rice-Wheat System under Conservation and Conventional Agriculture in Western Chitwan, Nepal

Madhab Paudel1, , Shrawan Kumar Sah2, Andrew McDonald3 and Narendra Kumar Chaudhary4

1Agro Enterprise Centre, Federation of Nepalese Chambers of Commerce and Industries, Dadeldhura, Nepal

2Department of Agronomy, Agriculture and Forestry University, Rampur, Chitwan, Nepal

3CIMMYT, South Asia Regional Office, Kathmandu, Nepal

4Institute of Agriculture and Animal Science, Tribhuvan University, Kathmandu, Nepal

Pub. Date: December 28, 2014
(This article belongs to the Special Issue Conservation Agriculture for Sustainable Intensification)

Cite this paper:
Madhab Paudel, Shrawan Kumar Sah, Andrew McDonald and Narendra Kumar Chaudhary. Soil Organic Carbon Sequestration in Rice-Wheat System under Conservation and Conventional Agriculture in Western Chitwan, Nepal. World Journal of Agricultural Research. 2014; 2(6A):1-5. doi: 10.12691/wjar-2-6A-1

Abstract

Soil organic carbon plays the crucial role in maintaining soil quality. The impact and rate of SOC sequestration in CA and conventional agriculture is still in investigation in this environment. A field experiment was initiated in 2011/12 and continued up to 2012/13 to compare the organic carbon buildup in the soil due to conservation and conventional agriculture. The soil organic carbon data represents the cumulative after five crop cycle. The treatments consisted conventionally tilled direct seeded rice followed by zero tilled wheat, conventionally tilled transplanted rice followed by conventionally tilled wheat, zero tilled direct seeded rice followed by zero tilled direct seeded wheat without residue retention, zero tilled direct seeded rice followed by direct seeded wheat with residue retention, permanent raised bed of rice followed by wheat without residue retention and permanent raised bed of rice followed by wheat with residue retention in randomized complete block design with three replications. About 4 t ha-1 of standing rice and wheat crop and about 70% residue of moongbean was retained for succeeding crop in retained treatments. Soil samples from each treatments were collected from two soil depths (0-20 and 20-40cm) and analyzed. Result showed that, soil organic carbon buildup was affected significantly by tillage and residue level in upper depth of 0-20 cm but not in lower depth of 20-40 cm. Higher SOC content of 19.44 g kg-1 of soil was found in zero tilled residue retained plots followed by 18.53 g kg-1 in permanently raised bed with residue retained plots. Whereas, the lowest level of SOC content of 15.86 g kg-1 of soil were found in puddled transplanted rice followed by wheat planted under conventionally tilled plots. Zero tilled residue retained plots sequestrated 0.91 g kg-1 yr-1 SOC in the year 2012/13 which was 22.63% higher over the conventionally tilled residue removed plots after five seasons of experimentation. Therefore, CA in rice-wheat system can help directly in building–up of soil organic carbon and improve the fertility status of soil.

Keywords:
soil organic carbon CA rice-wheat system residue retention

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