Abstract
Abstract Lettuce (Lactuca sativa L.) seed coatings containing a granular activated carbon layer adjacent to the seed and overcoated with standard coating materials gave faster, more complete and more uniform seedling emergence than did simple coatings with standard materials. Evidence suggests the granular carbon layer acts to speed O2 diffusion into and adsorb endogenous growth inhibitors excreted from the germinating seeds. Variability of seedling emergence was found to be inversely related to the mean emergence rate.
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