Crop residues and fertilizer nitrogen influence residue decomposition and nitrous oxide emission from a Vertisol

Muhammad, W, Vaughan, SM, Dalal, RC and Menzies, NW (2011) Crop residues and fertilizer nitrogen influence residue decomposition and nitrous oxide emission from a Vertisol. Biology And Fertility of Soils, 47 1: 15-23. doi:10.1007/s00374-010-0497-1


Author Muhammad, W
Vaughan, SM
Dalal, RC
Menzies, NW
Title Crop residues and fertilizer nitrogen influence residue decomposition and nitrous oxide emission from a Vertisol
Journal name Biology And Fertility of Soils   Check publisher's open access policy
ISSN 0178-2762
Publication date 2011-01
Year available 2010
Sub-type Article (original research)
DOI 10.1007/s00374-010-0497-1
Volume 47
Issue 1
Start page 15
End page 23
Total pages 9
Place of publication Germany
Publisher Springer
Collection year 2011
Language eng
Formatted abstract
Crop residues with high C/N ratio immobilize N released during decomposition in soil, thus reducing N losses through leaching, denitrification, and nitrous oxide (N2O) emission. A laboratory incubation experiment was conducted for 84 days under controlled conditions (24°C and moisture content 55% of water-holding capacity) to study the influence of sugarcane, maize, sorghum, cotton and lucerne residues, and mineral N addition, on N mineralization-immobilization and N2O emission. Residues were added at the rate of 3 t C ha-1 to soil with, and without, 150 kg urea N ha-1. The addition of sugarcane, maize, and sorghum residues without N fertilizer resulted in a significant immobilization of soil N. Amended soil had significantly (Ṕ 0.05) lower NO3--N, which reached minimum values of 2.8 mg N kg-1 for sugarcane (at day 28), 10.3 mg N kg-1 for maize (day 7), and 5.9 mg N kg-1 for sorghum (day 7), compared to 22.7 mg N kg-1 for the unamended soil (day 7). During 84 days of incubation, the total mineral N in the residues + N treatments were decreased by 45 mg N kg-1 in sugarcane, 34 mg kg-1 in maize, 29 mg kg-1 in sorghum, and 16 mg kg-1 in cotton amended soil compared to soil + N fertilizer, although soil NO3--N increased by 7 mg kg-1 in lucerne amended soil. The addition of residues also significantly increased amended soil microbial biomass C and N. Maximum emissions of N2O from crop residue amended soils occurred in the first 4-5 days of incubation. Overall, after 84 days of incubation, the cumulative N2O emission was 25% lower with cotton + N fertilizer, compared to soil + N fertilizer. The cumulative N2O emission was significantly and positively correlated with NO3--N (r = 0.92, Ṕ 0.01) and total mineral N (r = 0.93, Ṕ 0.01) after 84 days of incubation, and had a weak but significant positive correlation with cumulative CO2 in the first 3 and 5 days of incubation (r = 0.59, Ṕ 0.05). © 2010 Springer-Verlag.
Keyword Crop residues
Fertilizer N
Mineral N
Nitrous oxide
Vertisol
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Published online 4 September, 2010

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2011 Collection
School of Agriculture and Food Sciences
 
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Created: Thu, 17 Mar 2011, 11:07:01 EST by Professor Neal Menzies on behalf of School of Agriculture and Food Sciences