Influence of Cultivar, Season, Irrigation, and Date of Planting on Thiocyanate Ion Content in Cabbages1

Abstract
Tissue analysis of 14 cultivars of cabbage (Brassica oleracea L. Capitata group) in both 1974 and 1975 indicated that late maturing cultivars generally were higher in thiocyanate ion (SCN−) content than early maturing cultivars. In both years, there was a significant positive correlation between SCN− content of cultivars and days to maturity. While SCN− content of late-planted (June 18, 1975) unirrigated ‘Badger Market’ and ‘Storage Green’ cabbages were more than twice as high as corresponding late-planted cabbages irrigated 5 times per week, the SCN− content of early-planted (May 6) cabbages of both cultivars was not significantly influenced by irrigation treatment. In contrast, the marketable head fresh weight of both cultivars was lowest in late-planted, unirrigated plots. Head SCN− content was negatively correlated with marketable head fresh weight and with total top weight of both cabbage cultivars.

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