Carbon storage and light fraction C in a grassland Dark Gray Chernozem soil as influenced by N and S fertilization

A field experiment was conducted at Canwood, Saskatchewan to determine if annual applications of nitrogen (112 kg N ha −1 ) and sulphur (11 kg S ha −1 ) fertilizers to grass over 13 yr (1980 to 1992) could increase storage of total C (TC) and light fraction C (LFC) in a Dark Gray Chernozem soil. Hay was removed from the plots every year. The increase in mass of TC in the 0- to 30-cm soil depth from NS fertilizer was 3.88 Mg C ha −1 . However, the increase in mass of LFC from NS was 9.50 Mg C ha −1 , and most of the increase was found in the 0- to 5-cm soil depth.