Increased access to root available nutrients increases the size and health of plants. Dr. Xiaoyu Liu and a series of other researchers published a paper examining 238 studies of biochar's influence on plant productivity. They found that vegetables increased by 28.6%, and that legume crops, such as peas, beans, and vetch, increased productivity by 30.3%.

In the 2016 San Juan County field trials, the research team found a 28% increase in crop yield of winter squash when biochar was applied to soils as opposed to the control plot, and an additional 13% increase with charged biochar.