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Response of  drainage water quality to fertilizer applications on a switchgrass inrcropped coastal pine forest


Augustine Muwamba
George M. Chescheir
Jamie E. Nettles
Timothy Appelboom
Ernest W. Tollner
Hebert Ssegane
Mohamed A. Youssef
Francois Birgand
Timothy Callahan



Publication type:

Scientific Journal (JRNL)

Primary Station(s):

Southern Research Station




The objectives of this study were (1) to test the hypothesis that fertilizer applications do not increase nutrient fluxes on a switchgrass/pine forest (IC) when compared to a mature pine forest (MP) and (2) to evaluate post-fertilization (post-fert, 2014–2016) fluxes of nitrogen (N) and phosphorus (P) on IC and compare them to those observed during switchgrass growth prior to fertilization (pre-fert, 2012–2014) and site preparation for switchgrass establishment (site prep, 2009–2012). Nitrogen and P were applied to IC, a paired pure switchgrass site (SG), and MP, each about 25 ha in size, in June 2014, and again in June 2015 for the IC and SG sites only. Nitrogen and P concentrations were measured biweekly and rainfall and drainage outflow were measured continuously. During post-fert, the mean N concentrations and total loads were lower (p < 0.05) in IC than in SG and MP. The mean NO3-N concentration and loads in IC were lower during post-fert than during site prep. The post-fert phosphate concentrations in IC were lower than they were during pre-fert and site prep. Frequent N and P applications in IC did not significantly (α = 0.05) increase N and P fluxes, likely due to plant uptake and sorption on the acidic site.


Muwamba, Augustine; Amatya, Devendra M.; Chescheir, George M.; Nettles, Jamie E.; Appelboom, Timothy; Tollner, Ernest W.; Ssegane, Hebert; Youssef, Mohamed A.; Birgand, Francois; Callahan, Timothy. 2020. Response of  drainage water quality to fertilizer applications on a switchgrass inrcropped coastal pine forest. Water. 12(5): 1265.


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