. Auxins and plant growth. Auxin; Plant growth promoting substances. ^3 2,4-D-niethioiune amide N-meta-tolylphthalamic Benzothiazole-2-oxyacetic Acid Acid Epinastic agents which are not auxins are effective in fruit-set as well as auxins. Derivatives of phthalamic acid have been shown to induce fruit-set (Hoffman and Smith, 1949), as also have various ben- zoic acid derivatives (Zimmerman and Hitchcock, 1942). N-meta-tolyl- phthalamic acid has shown promising results as an overall plant spray for setting tomatoes (U. S. Patent No. 2,556,665). This is a highly de- sirable characteristic, for th
. Auxins and plant growth. Auxin; Plant growth promoting substances. ^3 2,4-D-niethioiune amide N-meta-tolylphthalamic Benzothiazole-2-oxyacetic Acid Acid Epinastic agents which are not auxins are effective in fruit-set as well as auxins. Derivatives of phthalamic acid have been shown to induce fruit-set (Hoffman and Smith, 1949), as also have various ben- zoic acid derivatives (Zimmerman and Hitchcock, 1942). N-meta-tolyl- phthalamic acid has shown promising results as an overall plant spray for setting tomatoes (U. S. Patent No. 2,556,665). This is a highly de- sirable characteristic, for the application of sprays to the flower clusters only is costly in labor. N-meta-tolylphthalamic acid is not an auxin, but has synergistic activity with auxin in the pea straight-growth test (Leopold, unpublished). The concentration of auxin used has a quantitative effect on fruit-set. Increasing concentrations of auxin give a comparable in- crease in percentage fruit-set obtained (figure 93) as well as in initial growth rate (figure 23). Although the optimum concentration for fruit-set varies considerably from one experiment to another, still the greatest percentage of fruit-set is generally obtained at concentrations between 30 and 250 of PCA or BNOA. The quantitative. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Leopold, A. Carl (Aldo Carl), 1919-. Berkeley, University of California Press
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