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Effects of Some Triazines on Corn and Bean Plants Grown on Natural and Amended Soils

Phytotoxic effects of some triazines were studied for corn grown on soil amended to be acid, neutral, or calcareous. One of the triazines (prometryne) was more phytotoxic than others to corn on calcareous soil. Atrazinc was not toxic to corn on any of the soils at commercial application rates although it was mildly toxic in nutrient solution and in soil at high application rates. Somewhat more C¹⁴-atrazine was absorbed by corn from calcareous soil than from noucalcareous soil and more from solution at high pH than at low pH. Bush beans, for which atrazine is toxic, contained no more C¹⁴ from a C¹⁴-atrazine application than did corn. Toxicity to coru with atrazine in solution culture was increased rather than decreased by a decreased Ca level. Fe and Zn chelates did not overcome any of the phytotoxicities.

Key Words: Metal chelates • Micronutrients • Soil organic matter • C¹⁴-atrazine

Received for publication September 29, 1967.