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The Center for Native Grasslands Management

Title: Eastern gamagrass response to nitrogen fertilization in northern Mississippi
Year: 2002
Author(s): Douglas, J. L., Edwards, S. D., Lang, D. L., Elmore, R. L., Ivy, R. L., Howell, J. L.
Source Title: Proceedings of the Third Eastern Native Grass Symposium
Source Type: Proceedings
pages: 240-247
Original Publication:  
Abstract: An eastern gamagrass accession (9062680) selected by the USDA-NRCS, Jamie L. Whitten Plant Materials Center may have potential for forage use in the southeastern US, but information on it’s response to N fertilizer is lacking. Objective of this study was to evaluate yield response, physiological efficiency, apparent fertilizer nitrogen recovery, and nitrogen use efficiency of 9062690 to N fertilizer. Nitrogen rates of 0, 134, 268, 403, and 538 kg ha-1 were applied to replicated plots at Coffeeville, Prairie, and Starkville, MS in three equal split applications. The first application of N was applied at green-up and after each harvest except for the final harvest. Nitrogen rates of 134, 268, 403, and 538 kg ha-1 significantly increased DM yield over the 0 rate at all locations. Dry matter yield ranged from 3200 to 13,499 kg ha-1 depending on N rate and location. Physiological efficiency declined as N rates increased and ranged from 38-90 kg kg-1. Apparent fertilizer nitrogen recovery was highest at the 268 kg ha-1 but declined at the higher N rates. Recovery ranged from 14-30%. Nitrogen use efficiency was highest at N rates of 134 and 268 kg ha-1 resulting in NUE of 13 to 17 kg kg-1. Preliminary results indicate N rates of 134 and 268 kg ha-1 produce reasonable yields with the highest NUE, PE, and AFNR for accession 9062680.
Publisher: The North Carolina Botanical Garden, Chapel Hill, NC, October 1-3, 2002. Omnipress, Madison, WI
Editor(s): J. Randall