Abstract
During 1997 through 1999 mature `Southland' muscadine grapes were grown in Griffin, Ga., with different rates of daily irrigation. Irrigation rates were 0, 15, 22.5, and 30 L·d–1 (LPD), supplied to individual plants through 2 emitters. In 1997, substantial water deficit occurred during August, in 1998 during May and June, and in 1999 during July and August. The greatest yield response to irrigation was observed during 1998. No significant response to irrigation was observed during 1999, even though soil water was greatly depleted in the upper 30 cm late in the season for control plants. The 3-year average response of total yield indicated a significant response to irrigation, with the greatest yield occurring at the 22.5 LPD rate. Together these data suggest that muscadine grapes respond to irrigation, especially when water deficits during the early to mid season are prevalent. With single trellis vines, 22.5 LPD should provide adequate water in warm, humid regions similar to the southeastern U.S.
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