“…Nonetheless, the highest tryptamine levels were again obtained in the uppermost leaves of plants receiving ammonium sulfate, particularly when fertilizers were applied at high rates (Parmar 197 s). DISCUSSION From the studies of Dickinson, Carlson and associates (1961,1968,1972) Marten and associates (Marten 1973) have shown that proportions of the several tryptamines in RCG are under strong genetical control, but that their concentration may be modified by nutritional conditions; moreover, a relationship to differential palatability of RCG strains has been related to differential alkaloid concentration (Simons 1970;Simons and Marten l97l). Ranchers have also noted rnarked changes in palatability of RCG after applications of fertilizer.…”