This study compared the effects of mineral fertilizer (MF) and liquid hog manure (LHM) applications on the concentration and molecular size of dissolved organic carbon (DOC) released in runoff and tile-drain water under corn (Zea mays L.) and forage cropping systems. It was concluded that incorporation
of corn residues and LHM increased the concentration of
DOC and the relative size of the molecules in surface runoff water,
whereas DOC in tile-drain water was mostly influenced by the cropping
system with relatively more DOC and larger molecules under
forage than corn.