Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6408955 | Geoderma | 2014 | 8 Pages |
â¢Cumulative CH4 emission was highest in rice straw + urea-N treatmentâ¢Cumulative N2O emission was highest in poultry manure + urea-N treatmentâ¢Global warming potential was highest in rice straw + urea-N treatmentâ¢Compost + urea-N had lowest GHGI, highest CER and highest yieldâ¢Compost + urea-N could be an effective option to mitigate CH4 and N2O emissions
Methane and nitrous oxide emissions, their global warming potential, carbon efficiency ratio and related biogeochemical properties of a tropical soil planted to rice were investigated under different N management [i.e. urea-N (120 kg N haâ 1), rice straw (RS) (30 kg N haâ 1) + urea-N (90 kg N haâ 1), compost (C) (30 kg N haâ 1) + urea-N (90 kg N haâ 1) and poultry manure (PM) (30 kg N haâ 1) + urea-N (90 kg N haâ 1)]. CH4 fluxes were increased by 82.7%, 65.1%, 63.4% and 31.9% in RS + urea-N, C + urea-N, PM + urea-N and urea-N, respectively whereas percentage increase in cumulative N2O emission was 390.6, 371.8, 315.6, and 253.1 in PM + urea-N, urea-N, C + urea-N and RS + urea-N, respectively over control (no fertilizer amendment). However, increase of GWPs in different manure + urea-N over that of control were 85.5%, 69.2%, 68.8% and 37.6% in RS + urea-N, C + urea-N, PM + urea-N and urea-N, respectively. Microbial biomass carbon (MBC), readily mineralizable carbon (RMC) and fluorescence diacetate (FDA) hydrolysis activity were significantly affected by integrated N-management and followed the order of C + urea-N > PM + urea-N > RS + urea-N > urea-N > control. With considerably high microbial biomass C and microbial activity, high C efficiency ratio, high yield and low greenhouse gas intensity, C + urea-N could be a better option to mitigate CH4 and N2O emissions and to maintain soil biological quality and yield in tropical paddy.
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