Rooting experiments on layers of Ficus elastica Roxb. ex Hornem., Dieffenbachia amoena Bull., Cordyline terminalis (L.) Kunth, Dracaena deremensis Engl., and on shoots of Ficus elastica, Begonia masoniana Irmsch, Aglaonema costatum N.E. Br., Saintpaulia ionatha H. Wendl. were performed to ascertain the possibility of employing earthworm casting in plant propagation. Rooting of layers was favored when casting alone was supplied whereas, rooting of shoots generally was enhanced when casting mixtures were used.
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Grappelli et al. (1985) studied this question.
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