Abstract
The success of plants growing in a particular area is determined by several factors; among these factors, interference from other plants figures prominently. Agronomists have been concerned for some time with the interference generated among plants grown in pure culture, the usual condition of crop plants. They have also been interested in the effects of ruderal species where these were grown with crop plants (Donald 1963). The interference is generally expressed by the depression of growth in one group of plants, such as that found by Putwain & Harper (1970). Often the interference takes the form of competition for a growth factor which is present in the environment in limited quantity (Bleasdale 1960). Most experiments investigating competition have been performed with two different species. Intraspecific work has been done (Kira, Ogawa & Sakazaki 1953), but, to our knowledge, no studies have been made of competition between ecotypes. This paper examines competition for mineral nutrients between two ecotypes of a composite, Galinsoga ciliata (Raf.) Blake.
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