Abstract ‘Mcintosh’ apple trees were grown under greenhouse and outdoor conditions in 30 lb. cans containing soil-incorporated simazine at concentrations of 0.2–6.4 ppm. Differences in fresh weight increase occurred at lower concentrations than did differences in terminal growth or visual symptoms. The lowest concentration at which simazine adversely affected fresh weight increase of the greenhouse-grown trees was 1.6 ppm for the 2 soils used in the study. Root development was drastically reduced at 3.2 and 6.4 ppm simazine. There was a suggestion that trees on MM 106 rootstock were more tolerant to simazine than those on EM VII and EM IX rootstocks. A significant increase in per cent leaf N resulted from simazine treatments in the outdoor experiment, but with the greenhouse-grown trees this response was found only on the lighter of the 2 soils and at injurious simazine levels.
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Robinson et al. (1970) studied this question.