In the first study of its kind, Rice University scientists have used synthetic biology to study how a popular soil amendment called “biochar” can interfere with the chemical signals that some microbes use to communicate. The class of compounds studied includes those used by some plant pathogens to coordinate their attacks.

Biochar is charcoal that is produced — typically from waste wood, manure or leaves — for use as a soil additive. Studies have found biochar can improve both the nutrient- and water-holding properties of soil, but its popularity in recent years also owes to its ability to reduce greenhouse gases by storing carbon in soil, in some cases for many centuries.

The new study, published online this month in the journal Environmental Science and Technology, is the first to examine how biochar affects the chemical signaling that’s routinely used by soil microorganisms that interact with plants.