By Devin Voss
For years, both scientists and farmers have debated whether the use of cover crops—plants used to cover the ground after harvesting of main crops—have a positive or negative impact on subsequent crop yield. Hundreds of studies have been performed on the subject, with each resulting in a different conclusion.
Researchers at the Indiana University School of Science in Indianapolis compiled data from more than 100 field trials across the globe and found that cover crops have a net-positive impact, overall increasing crop yield by 2.6% globally. Standing out among the findings was how substantially yields benefited from the use of legumes as cover crops, including peas, vetch, and clover.
Yu Peng, a Ph.D. student in the School of Science, led a comprehensive study using literature synthesis and meta-analysis to quantify the results of the data gathered. Peng and his team collected over 1,000 records of field-based yield data and analyzed how cover crop type, soil texture, soil water conditions, aridity, cover crop duration, and other management practices impact crop yield.
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