Switchgrass Management Practice Effects on Near-Surface Soil Properties in West-Central Arkansas

Alayna Jacobs; Kristofor R. Brye; Randy King; Joel Douglas; Lisa S. Wood; Larry C. Purcell; Michael Looper

doi:10.4236/ojss.2015.53008

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OJSS> Vol.5 No.3, March 2015

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Switchgrass Management Practice Effects on Near-Surface Soil Properties in West-Central Arkansas ()

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DOI: 10.4236/ojss.2015.53008 3,357 Downloads 3,966 Views Citations

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Alayna Jacobs¹, Kristofor R. Brye^1*, Randy King², Joel Douglas³, Lisa S. Wood¹, Larry C. Purcell¹, Michael Looper⁴

Affiliation(s)

¹Department of Crop, Soil, and Environmental Sciences, University of Arkansas, Fayetteville, USA.
²USDA-NRCS Plant Materials Center, Booneville, USA.
³USDA-NRCS Central National Technology Support Center, Fort Worth, USA.
⁴Department of Animal Science, University of Arkansas, Fayetteville, USA.

ABSTRACT

Agronomic management practices that maximize monoculture switchgrass (Panicum virgatum L.) yield are generally well understood; however, little is known about corresponding effects of differing switchgrass management practices on near-surface soil properties and processes. The objective of the study was to evaluate the effects of cultivar (“Alamo” and “Cave-in-Rock”), harvest frequency (1- and 2-cuts per year), fertilizer source (poultry litter and commercial fertilizer), and irrigation management (irrigated and non-irrigated) on near-surface soil properties and surface infiltration in a Leadvale silt loam (fine-silty, siliceous, semiactive, thermic, Typic Fragiudult) after four years (2008 through 2011) of consistent management in west-central Arkansas. Irrigating switchgrass increased (P < 0.01) soil bulk density in treatment combinations where poultry litter was applied (1.40 g?cm?3) compared to non-irrigated treatment combinations (1.33 g?cm?3). Root density was greater (P = 0.031) in irrigated (2.62 kg?cm?3) than in non-irrigated (1.65 kg?cm?3) treatments when averaged over all other treatment factors. The total infiltration rate under unsaturated conditions was greater (P = 0.01) in the 1-cut (33 mm?min?1) than 2-cut (23 mm?min?1) harvest treatment combinations when averaged over all other treatment factors, while the total infiltration rate under saturated conditions did not differ among treatment combinations (P > 0.05) and averaged 0.79 mm?min?1. Results from this study indicate that management decisions to maximize switchgrass biomass production affect soil properties over relatively short periods of time, and further research is needed to develop local best management practices to maximize yield while maintaining or improving soil quality.

KEYWORDS

Soil Bulk Density, Infiltration, Extractable Soil Nutrients

Cite this paper

Jacobs, A. , Brye, K. , King, R. , Douglas, J. , Wood, L. , Purcell, L. and Looper, M. (2015) Switchgrass Management Practice Effects on Near-Surface Soil Properties in West-Central Arkansas. Open Journal of Soil Science, 5, 69-86. doi: 10.4236/ojss.2015.53008.

Conflicts of Interest

The authors declare no conflicts of interest.

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