Two alfalfa cultivars, Rambler and Alfa, were grown at two soil fertility levels to assess a phytotoxic effect of two soils on the growth of alfalfa in a growth chamber at three root-zone temperatures. Different root-zone temperatures (10, 15, and 20 C) produced no differential effect on the characteristic unthrifty growth of alfalfa and therefore cannot be recommended as a tool to aid in the assessment of the condition. However, best growth of herbage and roots occurred al 15 C, which appears to be the most suitable temperature for growth of alfalfa in growth chambers. Addition of fertilizer did not amend the phytotoxic soil effect and the two cultivars reacted in a near-equal manner to the condition.
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McELGUNN et al. (1970) studied this question.
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