 found accumulation rates ranging from 0.42 to 3.8 tonnes per hectare per year, 
 
with a mean accumulation rate of 1.84 tonne (0.74 tonnes per acre per year), or 20% of total harvested carbon per year.The grass sequesters carbon in its continually increasing root biomass, together with carbon input from fallen leaves.Typically, perennial crops sequester more carbon than annual crops because the root buildup is allowed to continue undisturbed over many years.