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Effect of Atrazine Carryover on Malting Quality of Barley¹

This study was a continuation of an earlier study which showed that spring barley (Hordeum vulgare L. and H. distichum L.) produced higher grain and straw yields in soil containing atrazine (2-chloro-4-ethylamino-6-isopropylamino-s-triazine) carryover than spring oats (Avena sativa L.). and spring wheat (Triticum aestivum L.). The objective of this study was to evaluate the effect of atrazine carryover on malting quality of barley.

In 1976 and 1977, six barley genotypes were grown to maturity in soil containing atrazine carryover, and the seed was analyzed for malting quality. Atrazine treatments (0, 1.12, 2.24, 3.36, and 4.48 kg of active ingredient/ha) had been applied postemergence to corn (Zea mays L.) 1 year prior to growing the barleys.

Light atrazine carryover had a minor effect on malting quality, but heavy carryover reduced quality considerably. Heavy atrazine carryover reduced kernel weight, kernel plumpness, kernel color, malt extract, and wort color, and increased barley and wort protein percentages, diastatic power, and alpha amylase activity. With the possible exception of the increases in the two enzyme systems, all of these changes detracted from malting quality.

Although genotype x atrazine level interactions were significant for several quality parameters, only one interaction had special importance. In both years, the genotype ‘Morex’ maintained a high malt extract despite increasing atrazine carryover.

Key Words: Genotype x atrazine interaction • Kernel plumpness • Kernel color • Malt extract • Protein percentage

² Associate professor, former graduate student (present address: Univ. of Minnesota, Southern Exp. Stn., Waseca, MN 56093), professor, and research chemist (USDA/SEA/AR) and adjunct professor, Dep. of Agronomy, Univ. of Wisconsin, Madison, WI 53706.

Received for publication March 18, 1980.