Author
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Van Donk, Simon |
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Merrill, Stephen |
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Tanaka, Donald |
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Krupinsky, Joseph |
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Submitted to: Meeting Abstract
Publication Type: Other Publication Acceptance Date: 9/26/2005 Publication Date: 11/6/2005 Citation: Van Donk, S.J., Merrill, S.D., Tanaka, D.L., Krupinsky, J.M. 2005. Comparison of measured residue cover with that simulated by the the Wind Erosion Prediction System. Poster Presentation. ASA-CSSA-SSSA International Annual Meeting, Salt Lake City, Utah, November 6 - 10, 2005. Interpretive Summary: Poster Presentation Technical Abstract: Cover provided by crop residue is very important for controlling wind erosion. The Wind Erosion Prediction System (WEPS) includes a model for the decomposition of crop residue. It simulates the fall rate of standing residue and the decomposition of standing and flat residue as a function of temperature and moisture. It also calculates the fraction of soil covered by residue from flat residue mass. Most of the data used to develop this model have been measured in the southern USA. We measured residue mass at the time of harvest and soil fraction covered by residue just after planting the next spring in south-central North Dakota for ten crops: barley, canola, crambe, dry bean, dry pea, flax, safflower, soybean, sunflower, and spring wheat. The crops were grown under no-till conditions on a Wilton silt loam soil receiving on average about 400 mm of precipitation per year. We compared measured with WEPS simulated sunflower residue cover. Local weather data were used to drive the WEPS decomposition submodel. WEPS overestimated sunflower residue cover: simulated cover was 51% and measured cover was 35% in the beginning of May 2001. WEPS predicted zero stem fall during the winter after sunflower harvest, contradicting observations that snow storms flatten many sunflower stems in North Dakota. |
