Variation Among Tomato Lines with Respect to Ammonium Tolerance1

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Abstract
Variation within a particular species has resulted in the development of large numbers of cultivars in important horticultural and agronomic crops. A great number of characters are important in the determination of the merit of any cultivar. Variation among characters relating to plant nutrition have not been as well studied as some other characters. Nevertheless, sizeable reviews on this topic have been prepared by Millikan (4) and Vose (5). Stem lesions (Fig. 1) resulting from excess ammonium have recently been described (2, 3). Differences in varietal susceptibility were indicated. The purpose of this investigation was to ascertain if further varietal differences among commercial and experimental lines could be demonstrated.

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