Publication date: 15 March 2016
Source:Geoderma, Volume 266
Author(s): Maria Arlene A. Adviento-Borbe, Bruce Linquist
Improved N fertilizer management practices can increase rice yields and mitigate global warming potential (GWP). While banding N has been shown to have positive effects on yield and nitrogen use efficiency (NUE), there is little information on how it affects greenhouse gas (GHG) emissions from flooded rice systems. We tested the hypothesis that in continuously flooded rice systems where GWP is dominated by CH4 emissions, deep placement of urea in bands would reduce CH4 and N2 O emissions. Rice yields and GHG emissions were measured from three field experiments which had three treatments: (1) no N (N0), (2) urea broadcast (U-BR) on soil surface and (3) urea banded at 7.52 O emissions were low to negative and did not differ among treatments. CH4 emissions were the major source of GWP emissions and cumulative emissions ranged from 6.3 to 2974 –C4 emissions, there was no effect of N placement on them.
Source:Geoderma, Volume 266
Author(s): Maria Arlene A. Adviento-Borbe, Bruce Linquist