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NEW HAVEN. CT, 05 MARCH  2012-030512JS03-Wade Elmer, a Plant Pathologist at the Connecticut Agricultural Experiment Station in New Haven, looks over a batch of tomato plants he is growing using Biochar, a material obtained from the carbonization of biomass. When added to the soil, Biochar helps the soil retain moisture as well as allowing the plants to use more nutrients. .Jim Shannon Republican-American