. Auxins and plant growth. Auxin; Plant growth promoting substances. Parthenocarpy 227 time can be a small but real advantage to commercial producers where early yields are financially of the highest value (VV^ittwer et al, 1948). Increases in Yield There appears to be considerable disagreement in the literature as to whether the use of auxins in setting tomatoes increases yield or not. The problem can be broken down into two parts: the first of these is the effect of auxins on fruit size, and the second is the question of auxin effects on early yield vs total yield. At present five reports in
. Auxins and plant growth. Auxin; Plant growth promoting substances. Parthenocarpy 227 time can be a small but real advantage to commercial producers where early yields are financially of the highest value (VV^ittwer et al, 1948). Increases in Yield There appears to be considerable disagreement in the literature as to whether the use of auxins in setting tomatoes increases yield or not. The problem can be broken down into two parts: the first of these is the effect of auxins on fruit size, and the second is the question of auxin effects on early yield vs total yield. At present five reports in the literature indicate that no increases in fruit size were obtained following the use of auxin and eight other reports show distinct gains in fruit size. The cases in which gains were found are all cases in which the auxin was applied locally to the flower cluster and not as an overall j^lant spray. Extensive tests reported by Mann and Minges (1949) show that significant gains in fruit size can UJ > UJ > I- < ID o. 3 August TIME Fig. 97. The effects of forcing fruit-set in field tomatoes with auxin (p-chloro- phenoxyacetic acid) upon the harvest pattern of marketable fruit (Mann and Minges, 1949).. 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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