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Compatibility of 2-Chloro-6-(Trichloromethyl) Pyridine with Medicago sativa L. Inoculated with Rhizobium meliloti¹

Synopsis: Greenhouse tests indicated no reduction in the survival of Rhizobium meliloti on alfalfa seeds and in soil fertilized with ammonium sulfate treated with 2-chloro-6-(trichloromethyl) pyridine. Reduction in seedling growth of alfalfa plants was severe at 20 ppm of 2-chloro-6-(trichlorornethyl) pyridine and slight at 1 ppm. Other deleterious effects on alfalfa seedlings were changes in nodule morphology and deformation of root tips.

² Associate Professor of Agronomy and Research Assistant, Agronomy Department, University of California, Riverside.

Received for publication May 4, 1963.