||This research evaluates potential carbon capture of sweet sorghum, switchgrass, and
corn grown in Portageville, Missouri, from 2007 to 2009. Our results showed that corn
grain C content averaged 43%, whereas C grain captured was 1.3–4.7 Mg C ha −1
depending on year and N rate. N fertilization significantly increased C capture, but not
C content of grain. C capture by switchgrass depended on cultivars and harvest date.
Switchgrass cv. Alamo biomass contained 46% C compared to 44% C for Blackwell's.
Alamo maximum C capture depended on year, being 9.8 Mg C ha −1 in 2008 and 13.4 Mg
C ha −1 in 2009. C is equivalent to 32.3–49.6 Mg CO 2 ha −1 , while Blackwell captured 3.7–
4.4 Mg C ha −1 . C in sweet sorghum biomass ranged from 42 to 45%, whereas total C
capture ranged from 3.2 to 13.8 Mg ha −1 according to year, soil, and N rate. The highest
C capture appeared in loam. Sweet sorghum aboveground biomass showed 82% C
captured in the stalk. When converted into CO 2 , C captured by sweet sorghum was
equivalent to 12–51 Mg CO 2 ha −1 . In addition to their biofuel potential, corn, switchgrass,
and sweet sorghum can substantially contribute to environmental cleaning by capturing
a significant amount of CO 2 .