Abstract
SummarySeedlings of Pinus Radiata D. Don were grown in sand in a glasshouse and in nutrient solution in a controlled environment cabinet and treated with 2‐chloroethylphosphonic acid (CEPA) applied in solution to whole root systems. A wide range of concentrations of CEPA (0.1 to 120 mg 1−1) promoted dichotomous branching of secondary and tertiary roots, on most seedlings, whether growing in solution or in sand.There was considerable variation in the response of individual plants to CEPA, with some treated plants branching profusely and some scarcely or not at all. Absence of artificial aeration of the solution in which root systems were growing enhanced the effect of CEPA in promoting root forking.
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