Type of Document Master's Thesis Author Beasley, Jeffrey S URN etd-04252002-130324 Title Nitrogen Regime Influence on Nutrient and Sediment Surface Runoff During Vegetative Establishment of Bermudagrass Degree Master of Science Department Crop and Soil Environmental Sciences Advisory Committee
Advisor Name Title Chalmers, David R. Committee Chair Ervin, Erik H. Committee Member Mullins, Gregory L. Committee Member Reneau, Raymond B. Jr. Committee Member Keywords
- Surface runoff
- Nitrogen loss
Date of Defense 2002-01-07 Availability unrestricted AbstractBermudagrass (Cynodon dactylon (L.) Pers.) is a popular turfgrass used throughout the Southeast. Bermudagrass is established primarily as sprigs on large acreage sites. Currently, the industry standard practice (ISP) of fertilization during
bermudagrass sprig establishment is 48.8 kg N ha-1 wk-1. This fertilizer rate can be excessive on morphologically immature sprigs in the initial weeks of establishment, thus making the possibility of offsite surface runoff N events more likely. Two experiments were conducted in 2000 and 2001 where sprigs were established at 2, 4, 6, 8, and 10 weeks prior to applying simulated rainfall (WPRS) following N fertilization rates of the ISP or a lower initial N (LIN) rate of 12.2 kg N ha-1 wk-1 the first four weeks and then
48.8 kg N ha-1 wk-1 until full establishment. At the tenth week all treatments were subjected to rainfall simulation at 63.5 mm hr-1. Once surface runoff was induced, rainfall continued for thirty minutes during which time runoff samples were taken every five minutes and analyzed for sediment losses, N concentrations in the nitrate and ammonium forms, and phosphorus losses as dissolved reactive P (DRP). Experimental results indicate an ability to curb N losses through surface runoff during the initial weeks of sprig establishment following the LIN with only modest delays in sprig establishment.
Sprigs established for the same time period, under the ISP or LIN, were very similar in
growth, release of surface runoff, and sediment losses during runoff events.
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