. Auxins and plant growth. Auxin; Plant growth promoting substances. Factors Altering Effectiveness 149 are characteristically the most sensitive to 2,4-D injury (see chapter XVI). In pineapple plants a fairly high carbohydrate level is known to be best for uniform forcing with auxin and it can be assumed that under such conditions the nitrogen level in the plant would not be excessive. >- QC O UJ X UJ. 13 Days TIME AFTER 2,4D APPLICATION Fig. 68. Injury to soybean plants by exposure to 20 of 2,4-D in a nutrient solution, comparing extent of injury at three levels of nitrogen nutriti
. Auxins and plant growth. Auxin; Plant growth promoting substances. Factors Altering Effectiveness 149 are characteristically the most sensitive to 2,4-D injury (see chapter XVI). In pineapple plants a fairly high carbohydrate level is known to be best for uniform forcing with auxin and it can be assumed that under such conditions the nitrogen level in the plant would not be excessive. >- QC O UJ X UJ. 13 Days TIME AFTER 2,4D APPLICATION Fig. 68. Injury to soybean plants by exposure to 20 of 2,4-D in a nutrient solution, comparing extent of injury at three levels of nitrogen nutrition (14, 56, 335 ppm). Injury was estimated on an arbitrary visual basis (Wolf et al, 1950). ENVIRONMENTAL FACTORS Environmental factors apparently have a bearing on the respon- siveness of the plant through means which cannot be explained solely on the basis of absorption, translocation, plant developmental stage and nutritive conditions as we understand them. Perhaps the most striking of these unexplained factors is that of temperature. It is well known that maximal auxin effectiveness is obtained at high temperatures and this can undoubtedly be explained in part by the greater absorption which one would expect on the basis of Rice's. 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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