Methane flux from rice/wheat agroecosystem as affected by crop phenology, fertilization and water level

Singh, Jaya; Raghubanshi, A. S.; Singh, Sunil Kumar; Kashyap, A. K.

doi:10.1007/bf00011448

Cited by 70 publications

(29 citation statements)

References 15 publications

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“…There was no significant difference in the CH 4 uptake in the LCC-and the conventional treatments. A similar pattern of CH 4 uptake in soil under wheat crop was observed by Singh et al (1996).…”

Section: Methane Uptake In Wheatsupporting

confidence: 82%

Greenhouse gas mitigation in rice–wheat system with leaf color chart-based urea application

Bhatia

Pathak

Jain

et al. 2011

Environ Monit Assess

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Conventional blanket application of nitrogen (N) fertilizer results in more loss of N from soil system and emission of nitrous oxide, a greenhouse gas (GHG). The leaf color chart (LCC) can be used for real-time N management and synchronizing N application with crop demand to reduce GHG emission. A 1-year study was carried out to evaluate the impact of conventional and LCC-based urea application on emission of nitrous oxide, methane, and carbon dioxide in a rice-wheat system of the Indo-Gangetic Plains of India. Treatments consisted of LCC scores of ≤4 and 5 for rice and wheat and were compared with conventional fixed-time N splitting schedule. The LCC-based urea application reduced nitrous oxide emission in rice and wheat. Application of 120 kg N per hectare at LCC ≤ 4 decreased nitrous oxide emission by 16% and methane by 11% over the conventional split application of urea in rice. However, application of N at LCC ≤ 5 increased nitrous oxide emission by 11% over the LCC ≤ 4 treatment in rice. Wheat reduction of nitrous oxide at LCC ≤ 4 was 18% as compared to the conventional method. Application of LCC-based N did not affect carbon dioxide emission from soil in rice and wheat. The global warming potential (GWP) were 12,395 and 13,692 kg CO(2) ha(-1) in LCC ≤ 4 and conventional urea application, respectively. Total carbon fixed in conventional urea application in rice-wheat system was 4.89 Mg C ha(-1) and it increased to 5.54 Mg C ha(-1) in LCC-based urea application (LCC ≤ 4). The study showed that LCC-based urea application can reduce GWP of a rice-wheat system by 10.5%.

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Section: Methane Uptake In Wheatsupporting

confidence: 82%

Greenhouse gas mitigation in rice–wheat system with leaf color chart-based urea application

Bhatia

Pathak

Jain

et al. 2011

Environ Monit Assess

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“…Residues of rapeseed were only returned and buried into the experimental field in 2008, which might be one important reason for significant higher CH 4 emission in 2008. It has been documented that incorporation of fresh crop straw into rice paddy soils enhanced CH 4 emission (Singh et al 1996;Cai 1997;Zou et al 2005), usually triggering the fastest response at 2 or 4 weeks after incorporation (Lu et al 2000b). Higher average soil temperature during tillering, panicle differentiation and heading stage of rice in 2008 than that in 2007 might be another important influencing factor (Fig.…”

Section: Seasonal Variations Of Ch 4 Emission From Middle-rice Fieldmentioning

confidence: 98%

Dynamics of methane emission, active soil organic carbon and their relationships in wetland integrated rice-duck systems in Southern China

Zhan

Cao

Wang

et al. 2010

Nutr Cycl Agroecosyst

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A randomized field experiment with three replicates was conducted in the subtropical region of China to investigate the effects of integrated riceduck system (RD) on methane (CH 4 ) emission, active soil organic carbon fractions and their relationships in 2007 and 2008, compared with conventional rice system (CK). Methane emissions were measured at 7-9 days intervals using a closed static chamber technique, and two fractions of active soil organic carbon, namely, dissolved organic carbon (DOC) and microbial biomass carbon (MBC), were analyzed simultaneously. Soil DOC and MBC in RD and CK had similarly distinct seasonal variation patterns within the 2 years. During this time DOC and MBC concentrations were low at the early growth stage, increased during panicle differentiation and heading period, and dropped during grain filling period of rice. CH 4 emission fluxes from RD and CK followed a similar seasonal variation pattern both in 2007 and 2008. Two peaks of CH 4 emission were observed, the first at the tillering stage, second at panicle differentiation and heading stage. The CH 4 cumulative emission was reduced in RD by 19.3 and 19.6% in 2007 and 2008, respectively, compared with CK.

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“…The concentration of methane in a sample was determined by calculation using a standard curve obtained by injecting standard gas mixtures containing a known concentration of methane. The methane emission flux was calculated from the difference in methane concentration according to the equation of Parashar et al (1993) and Singh et al (1996):…”

Section: Methane Sampling and Measurementsmentioning

confidence: 99%

Characteristics of methane emission from wetland rice–duck complex ecosystem

Huang

Wang

Huang

et al. 2005

Agriculture, Ecosystems & Environment

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Methane flux from rice/wheat agroecosystem as affected by crop phenology, fertilization and water level

Cited by 70 publications

References 15 publications

Greenhouse gas mitigation in rice–wheat system with leaf color chart-based urea application

Greenhouse gas mitigation in rice–wheat system with leaf color chart-based urea application

Dynamics of methane emission, active soil organic carbon and their relationships in wetland integrated rice-duck systems in Southern China

Characteristics of methane emission from wetland rice–duck complex ecosystem

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