. Auxins and plant growth. Auxin; Plant growth promoting substances. Herbicides 287 Foliar Applications The herbicidal effects obtained are strongly dependent upon the concentration or the amount of auxin applied. A comparison of con- centration effects for three species is shown in figure 118. These curves fit very well with the generalized scheme of Woodford shown in figure 115. The effectiveness of different concentrations on mortality can be appraised only in the light of the injurious effects which may result to the crop itself. For example, in figure 118 it can be seen that the weight of
. Auxins and plant growth. Auxin; Plant growth promoting substances. Herbicides 287 Foliar Applications The herbicidal effects obtained are strongly dependent upon the concentration or the amount of auxin applied. A comparison of con- centration effects for three species is shown in figure 118. These curves fit very well with the generalized scheme of Woodford shown in figure 115. The effectiveness of different concentrations on mortality can be appraised only in the light of the injurious effects which may result to the crop itself. For example, in figure 118 it can be seen that the weight of tomato plants was seriously reduced by concentrations which were one hundred times more dilute than the lethal level. In contrast pigweed showed no change of plant weight until the lethal. 1000 10,000 MG/L CONG. OF 2,4-D Fig. 118. The effects of various concentrations of 2,4-D on kill, plant weight, and number of distorted leaves of three plant species. Plants were four weeks old at time of spraying, seven and one-half weeks at end of the experiment (Warren and Leopold, unpublished).. 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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