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Soil & Water Management & Conservation

Fertilizer Source and Soil Aeration Effects on Runoff Volume and Quality

^a USDA-ARS, 1420 Experiment Station Rd., Watkinsville, GA, 30677
^b 3113 Miller Plant Sciences Bldg., Dep. of Crop & Soil Sciences, Univ. of Georgia, Athens, GA 30602
^c Central Georgia Research and Education Center, 1508 Godfrey Rd., NW, Eatonton, GA 31024

^* Corresponding author (dfrankln{at}uga.edu)

Minimizing runoff losses from grasslands may benefit the producer and abate potential eutrophication of aquatic systems. This study was conducted to evaluate the effects of fertilizer source and soil aeration on the volume and quality of runoff from grassed plots. Sixteen tall fescue [Festuca arundinacea Schreb.]–bermudagrass [Cynodon dactylon L.] plots were established on Altavista sandy-loam soil (fine-loamy, mixed, semiactive, thermic Aquic Hapludults) in Georgia, USA. Two fertilizer sources (inorganic fertilizer [IF] and broiler litter [BL]) and two aeration treatments (aerated and nonaerated) were factorially combined to generate four experimental treatments. Broiler litter was applied at 1765 kg dry matter ha^–1 and IF was applied to match nutrient rates applied with BL (36 kg available N ha^–1, 39 kg P ha^–1, 60 kg K ha^–1). Simulated rainfall was applied immediately after fertilizer application and 1 mo later. Runoff samples were analyzed for dissolved reactive phosphorus (DRP), total Kjeldahl phosphorus (TKP), and ammonium (NH₄–N). In the first runoff event, plots fertilized with IF lost more TKP than plots fertilized with BL (3.4 vs. 1.1 kg P ha^–1). In contrast, plots fertilized with BL lost more NH₄–N than plots fertilized with IF (1.4 vs. 0.6 kg N ha^–1). These results support the use of different weighting factors for BL and IF when assessing their potential for contaminating surface runoff. Aeration numerically reduced runoff volume by 27%, though not significantly, in the first runoff event (P = 0.16), but did not affect runoff volume 1 mo later. Aeration did not affect the mass losses of DRP, TKN, and NH₄–N. These results indicate that aeration of hayed grasslands on these soils would not be expected to significantly affect the volume and quality of surface runoff.

Key Words: AN, ammonium nitrate • BL, broiler litter • DRP, dissolved reactive phosphorus • IF, inorganic fertilizer • TKP, total Kjeldahl phosphorus

This article has been cited by other articles:

				D. H. Franklin, M. L. Cabrera, L. T. West, V. H. Calvert, and J. A. Rema Aerating Grasslands: Effects on Runoff and Phosphorus Losses from Applied Broiler Litter J. Environ. Qual., January 9, 2007; 36(1): 208 - 215. [Abstract] [Full Text] [PDF]