Abstract
`Seyval blanc' and `Vidal blanc' grapevines were planted in 1983 at in-row spacings of 1.8, 2.4, 3.0, 3.6 and 4.8 m. Vineyard location is in the southcentral Missouri Ozark region, an area characterized by shallow soil and fluctuating winter temperature. A temperature of -28°C in January 1985 severely damaged the vines, which required retraining from the roots. Less time was needed to retrain close spaced vines to a single curtain cordon. Close spaced vines also yielded more in their first production year (1987). Wide spaced vines had increasingly higher pruning weight, yield, and cluster number per vine in later years. Juice soluble solids, pH and titratable acidity showed few differences among the spacing treatments. Close spaced vines were the most productive on a per meter of cordon basis. Competition between these vines has not yet reduced their productivity.
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