Paper
Effect of Site of Exposure to Nitrapyrin and 6-Choropicolinic Acid on Growth of Cotton and Wheat Seedlings
Published Sep 1, 1973 · J. Geronimo, L. L. Smith, G. Stockdale
Agronomy Journal
7
Citations
0
Influential Citations
Abstract
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.
Nitrapyrin reduces cotton and wheat seedling growth through both roots and shoots, while 6-chloropicolinic acid affects only roots, with the site of exposure playing a secondary role in phytotoxicity.
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