Some Effects of Plant Growth-Regulators on Seed Germination and Seedling Development

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Abstract
2,4-dichloro-phenoxyacetic acid inhibited germination, decreased the growth of young seedlings and caused abnormalities in the anatomy of the seedlings of 22 crop plants. 4-chlorophenoxy-acetic acid, 2,4,5-trichlorophenoxyacetic acid and 2-methyl-4-chlorophenoxyacetic acid produced the same responses with germinating seeds. Isopropyl-N-phenylcarbamate had less effect upon germinating cereal seeds in moist chambers than the chlorophenoxyacetic acids but completely prevented the establishment of cereals in soil. Mixtures of either 2,4-dichlorophenoxyacetic acid or 2,4,5-trichlorophenoxyacetic acid with isopropyl-N-phenylcarbamate proved an effective herbicide against young seedlings of both broadleaf and cereal species.