Study on effect of stock return to soil on water soluble organic carbon

Water soluble organic carbon (WSOC) plays an important role in carbon cycling to agriculture soil, a six continuous years' field experiment was conducted to study the effect of corn stock on soil water soluble organic carbon. There were three treatments: (1) control; (2) crushing stock; and (3) mulching stock. The results show that the concentrations of soil organic carbon (SOC) and WSOC in plots which received yearly applications of corn stock were significantly higher (P<0.05) than those of the control in the 6 years, and the concentrations of SOC and WSOC increased mainly in large aggregates. The concentrations of SOC and WSOC were not significantly affected by the different treatments, the WSOC concentration was significantly correlated with the SOC concentration (R 2 = 0.512).