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Residue Placement and Rate, Crop Species, and Nitrogen Fertilization Effects on Soil Greenhouse Gas Emissions

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Author(s): Jun Wang | Upendra M. Sainju | Joy L. Barsotti

Journal: Journal of Environmental Protection
ISSN 2152-2197

Volume: 03;
Issue: 09;
Start page: 1238;
Date: 2012;
Original page

Keywords: Greenhouse Gases | Residue Management | Nitrogen Fertilization | Crop Species | Spatial Variability

ABSTRACT
High variability due to soil heterogeneity and climatic conditions challenge measurement of greenhouse gas (GHG) emissions as influenced by management practices in the field. To reduce this variability, we examined the effect of management practices on CO2, N2O, and CH4 fluxes and soil temperature and water content from July to November, 2011 in a greenhouse. Treatments were incomplete combinations of residue placements (no residue, surface placement, and incorporation into the soil) and rates (0%, 0.25%, and 0.50%), crop species (spring wheat [Triticum aestivum L.], pea [Pisum sativum L.], and fallow), and N fertilization rates (0.11 and 0.96 g.N.pot-1). Soil temperature was not influenced by treatments but water content was greater under fallow with surface residue than in other treatments. The GHG fluxes peaked immediately following water application and/or N fertilization, with coefficient of variation (CV) ranging from 21% to 46%,
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