Agronomy Journal Journal of Natural Resources and Life Sciences Education
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Published online 1 September 1973
Published in Agron J 65:692-693 (1973)
© 1973 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Effect of Site of Exposure to Nitrapyrin and 6-Choropicolinic Acid on Growth of Cotton and Wheat Seedlings

J. Geronimo, L. L. Smith, Jr. and G. D. Stockdale2

Nitrapyrin (2-Chloro-6-(trichloromethyl) pyridine) is a selective nitrification inhibitor and 6-chloropicolinic acid is its principal metabolite in plants and soil. Nitrapyrin has been found to produce more phytotoxicity on some graminaceous species than 6-chloropicolinic acid, and the opposite has been found for some dicotyledenous species. This study was conducted to determine if the differences in activity observed with nitrapyrin and 6-chloropicolinic acid on some monocotyledenous and dicotyledenous species could be due, at least in part, to differences in the site of exposure of the seedlings to the two chemicals. Chemically treated bands of soil were placed either above or below the seeds of cotton (Gossypium hirsutum L.) and wheat (Triticum aestivum L.), and the effect of the chemicals was assessed by weighing top growth of the plants. Nitrapyrin reduced the top growth of both cotton and wheat when exposure occurred through both the roots and shoots of the germinating seedlings. 6-Chloropicolinic acid reduced the top growth of both species when exposure occurred through the roots only. The site of exposure of the germinating seedlings to the chemicals influences the degree of phytotoxicity obtained. The inherent activity of each compound against each species, however, appears to be a more important factor with regard to phytotoxicity.

Key Words: 2-Chloro-6-(trichloromethyl) pyridine • Phytotoxicity

2 Plant Physiologists and Laboratory Technician, Agricultural-Organics Department, The Dow Chemical Company, Walnut Creek, California.

Received for publication January 24, 1972.




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Copyright © 1973 by the American Society of Agronomy.