Impact of Nitrogen Fertilization on the Yield and Nutritive Value of Seeded Bermudagrass Grown in the Mid-Atlantic Region.
Christopher Teutsch, Southern Piedmont Research Ctr., Southern Piedmont AREC, 2375 Darvills Rd., Blackstone, VA 23824 and Mac Tilson, Southern Piedmont AREC, 2375 Darvills Rd., Blackstone, VA 23824.
In the northern transition zone, seeded bermudagrass could provide forage during the summer months. No information was available on the response of seeded bermudagrass to N fertilization for this region. A trial conducted near Blackstone, VA evaluated the response of a cold tolerant forage type seeded bermudagrass to N fertilization and first-year N availability of three organic N sources. Six N rates ranging from 0 to 560 kg ha-1 were applied as ammonium nitrate in a split application. Broiler litter, digested biosolid, and pelletized biosolid were applied at approximately 280 kg plant available N (PAN) ha-1 in a single application at spring green up. Yields ranged from 3400 to 16300 kg DM ha-1 and increased quadratically with N fertilization up to 460, 567, and 556 kg N ha-1 for the 2003, 2004, and 2005 growing seasons, respectively. First year N availability ranged from 49 to 51%, 27 to 34%, and 53 to 61% for broiler litter, digested biosolid, and pelletized biosolid, respectively. In this study, currently used equations overestimated PAN for broiler litter and underestimated it for pelletized biosolid.