Evaluating Biochar Cover (image) American Society of Agronomy Share Print E-Mail Caption Over 12 weeks, each biocover was evaluated for its effectiveness at reducing odor. The biochar could have a future use as a nutrient-rich soil amendment. Credit Brian Dougherty Usage Restrictions Please use with story only. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.