Assessment of Genetically Modified Corn, Glyphosate Application, and Tillage on Soil and Corn Plant Parameters.

Conservation tillage practices across the country have been implementing genetically engineered herbicide resistant crops along with applications of the herbicide glyphosate. We tested the hypothesis that seven years of glyphosate applications to glyphosate resistant or non-resistant corn (Zea mays L.) cultivars would impact soil and plant metrics, including nutrient uptake, yield parameters, and soil fertility.  In 2013 and 2014, transgenic and non-transgenic corn isolines were planted in respective plots.  Results from 2013 were previously reported (Locke et al., ASA Abstracts 2014), and results herein are from 2014, the final year of the study.