A short-term investigation of trace gas emissions following tillage and no-tillage of agroforestry residues in western Kenya

Elizabeth Baggs, J. Chebii, J. K. Ndufa

Research output: Contribution to journalArticle

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Abstract

Improved-fallow agroforestry systems are increasingly being adopted in the humid tropics for soil fertility management. However, there is little information on trace gas emissions after residue application in these systems, or on the effect of tillage practice on emissions from tropical agricultural systems. Here, we report a short-term experiment in which the effects of tillage practice (no-tillage versus tillage to 15 cm depth) and residue quality on emissions of N2O, CO2 and CH4 were determined in an improved-fallow agroforestry system in western Kenya. Emissions were increased following tillage of Tephrosia candida (2.1 g N2O-N ha(-1) kg N applied(-1); 759 kg CO2-C ha(-1) t C applied(-1); 30 g CH4-C ha(-1) t C applied(-1)) and Crotalaria paulina residues (2.8 g N2O-N ha(-1) kg N applied-1; 967 kg CO2-C ha(-1) t C applied(-1); 146 g CH4-C ha(-1) t C applied(-1)) and were higher than from tillage of natural-fallow residues (1.0 g N2O-N ha(-1) kg N applied(-1); 432 kg CO2-C ha(-1) t C applied(-1); 14.7 g CH4C ha(-1) t C applied(-1)) or from continuous maize cropping systems. Emissions from these fallow treatments were positively correlated with residue N content (r = 0.62-0.97; P < 0.05) and negatively correlated with residue lignin content (r = -0.56, N2O; r = -0.92, CH4; P < 0.05). No-tillage of surface applied Tephrosia residues lowered the total N2O and CO2 emitted over 99 days by 0.33 g N2O-N ha(-1) kg N applied(-1) and 124 kg CO2-C ha(-1) t C applied(-1), respectively; estimated to provide a reduction in global warming potential of 419 CO2 equivalents. However, emissions were increased from this treatment over the first 2 weeks. The responses to tillage practice and residue quality reported here need to be verified in longer term experiments before they can be used to suggest mitigation strategies appropriate for all three greenhouse gases. (c) 2005 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)69-76
Number of pages7
JournalSoil & Tillage Research
Volume90
DOIs
Publication statusPublished - 2006

Keywords

  • agroforestry residues
  • carbon dioxide
  • methane
  • nitrous oxide
  • no-till
  • residue quality
  • SOIL MICROBIAL BIOMASS
  • NITROUS-OXIDE
  • METHANE OXIDATION
  • IMPROVED FALLOWS
  • CROP RESIDUES
  • QUALITY
  • N2O
  • FERTILIZER
  • FLUXES
  • WHEAT

Cite this

A short-term investigation of trace gas emissions following tillage and no-tillage of agroforestry residues in western Kenya. / Baggs, Elizabeth; Chebii, J.; Ndufa, J. K.

In: Soil & Tillage Research, Vol. 90, 2006, p. 69-76.

Research output: Contribution to journalArticle

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T1 - A short-term investigation of trace gas emissions following tillage and no-tillage of agroforestry residues in western Kenya

AU - Baggs, Elizabeth

AU - Chebii, J.

AU - Ndufa, J. K.

PY - 2006

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N2 - Improved-fallow agroforestry systems are increasingly being adopted in the humid tropics for soil fertility management. However, there is little information on trace gas emissions after residue application in these systems, or on the effect of tillage practice on emissions from tropical agricultural systems. Here, we report a short-term experiment in which the effects of tillage practice (no-tillage versus tillage to 15 cm depth) and residue quality on emissions of N2O, CO2 and CH4 were determined in an improved-fallow agroforestry system in western Kenya. Emissions were increased following tillage of Tephrosia candida (2.1 g N2O-N ha(-1) kg N applied(-1); 759 kg CO2-C ha(-1) t C applied(-1); 30 g CH4-C ha(-1) t C applied(-1)) and Crotalaria paulina residues (2.8 g N2O-N ha(-1) kg N applied-1; 967 kg CO2-C ha(-1) t C applied(-1); 146 g CH4-C ha(-1) t C applied(-1)) and were higher than from tillage of natural-fallow residues (1.0 g N2O-N ha(-1) kg N applied(-1); 432 kg CO2-C ha(-1) t C applied(-1); 14.7 g CH4C ha(-1) t C applied(-1)) or from continuous maize cropping systems. Emissions from these fallow treatments were positively correlated with residue N content (r = 0.62-0.97; P < 0.05) and negatively correlated with residue lignin content (r = -0.56, N2O; r = -0.92, CH4; P < 0.05). No-tillage of surface applied Tephrosia residues lowered the total N2O and CO2 emitted over 99 days by 0.33 g N2O-N ha(-1) kg N applied(-1) and 124 kg CO2-C ha(-1) t C applied(-1), respectively; estimated to provide a reduction in global warming potential of 419 CO2 equivalents. However, emissions were increased from this treatment over the first 2 weeks. The responses to tillage practice and residue quality reported here need to be verified in longer term experiments before they can be used to suggest mitigation strategies appropriate for all three greenhouse gases. (c) 2005 Elsevier B.V. All rights reserved.

AB - Improved-fallow agroforestry systems are increasingly being adopted in the humid tropics for soil fertility management. However, there is little information on trace gas emissions after residue application in these systems, or on the effect of tillage practice on emissions from tropical agricultural systems. Here, we report a short-term experiment in which the effects of tillage practice (no-tillage versus tillage to 15 cm depth) and residue quality on emissions of N2O, CO2 and CH4 were determined in an improved-fallow agroforestry system in western Kenya. Emissions were increased following tillage of Tephrosia candida (2.1 g N2O-N ha(-1) kg N applied(-1); 759 kg CO2-C ha(-1) t C applied(-1); 30 g CH4-C ha(-1) t C applied(-1)) and Crotalaria paulina residues (2.8 g N2O-N ha(-1) kg N applied-1; 967 kg CO2-C ha(-1) t C applied(-1); 146 g CH4-C ha(-1) t C applied(-1)) and were higher than from tillage of natural-fallow residues (1.0 g N2O-N ha(-1) kg N applied(-1); 432 kg CO2-C ha(-1) t C applied(-1); 14.7 g CH4C ha(-1) t C applied(-1)) or from continuous maize cropping systems. Emissions from these fallow treatments were positively correlated with residue N content (r = 0.62-0.97; P < 0.05) and negatively correlated with residue lignin content (r = -0.56, N2O; r = -0.92, CH4; P < 0.05). No-tillage of surface applied Tephrosia residues lowered the total N2O and CO2 emitted over 99 days by 0.33 g N2O-N ha(-1) kg N applied(-1) and 124 kg CO2-C ha(-1) t C applied(-1), respectively; estimated to provide a reduction in global warming potential of 419 CO2 equivalents. However, emissions were increased from this treatment over the first 2 weeks. The responses to tillage practice and residue quality reported here need to be verified in longer term experiments before they can be used to suggest mitigation strategies appropriate for all three greenhouse gases. (c) 2005 Elsevier B.V. All rights reserved.

KW - agroforestry residues

KW - carbon dioxide

KW - methane

KW - nitrous oxide

KW - no-till

KW - residue quality

KW - SOIL MICROBIAL BIOMASS

KW - NITROUS-OXIDE

KW - METHANE OXIDATION

KW - IMPROVED FALLOWS

KW - CROP RESIDUES

KW - QUALITY

KW - N2O

KW - FERTILIZER

KW - FLUXES

KW - WHEAT

U2 - 10.1016/j.still.2005.08.006

DO - 10.1016/j.still.2005.08.006

M3 - Article

VL - 90

SP - 69

EP - 76

JO - Soil & Tillage Research

JF - Soil & Tillage Research

SN - 0167-1987

ER -