Over 96% of soybeans planted in Alabama are Roundup Ready varieties and receive at least one foliar application of glyphosate. Very little glyphosate is degraded within soybean plants and it tends to concentrate in roots and nodules. Some strains of Bradyrhizobium japonicum, the nitrogen fixing symbiont, are sensitive to glyphosate. If glyphosate has a negative impact on nitrogen fixation, less fixed nitrogen would be available to support high yields of soybean.
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