Tomato plants of the Johannisfeuer strain and the Red Currant strain, together with the F1 generation, were submitted to four treatments, providing four concentrations of Na2SO4 ranging from 4.6 to 124.6 milliequivalents of sulphate ion per liter of nutrient solution. 1. Plant height was less in all strains as the concentration increased. The growth depression resulting from the highest concentration was the same in all strains. 2. The dry weight of vines was less in all strains as the concentration increased. 3. The dry weight of the root system of the Johannisfeuer strain and the F1 generation was less when the concentration was increased. No statistically significant reduction in this respect was obtained for the Red Currant strain. 4. The total fresh weight of immature fruits produced by plants 87 days old, as well as the average weight per fruit, was less in two strains when salt concentration was increased. No differences were noted in the Red Currant strain. 5. The number of immature fruits produced by each plant of the F1 generation was less as the concentration increased. 6. The density of ripe fruits increased in all strains with increased concentration. 7. The mean weight of each ripe fruit of the Johannisfeuer strain and the F1 generation was less with increased concentration. 8. The diameter of the stem of plants harvested after ripening twenty fruits, as well as of plants harvested at an earlier date, was less in all strains with increased concentration. 9. The smaller stem diameter was caused by an inhibited development of each of the component tissue systems. 10. Inherent differences between strains are discussed for each of these characters.
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C. B. Lyon (1941) studied this question.