Comparison of the differences in the soil test index of the 0–50 cm soil layer under the different treatment conditions.

Data represent the mean values for soil organic matter, TN, C/N and microorganism quantity for the different treatment conditions (CK, H and L) during the observation period in the study area (July and September of 2009 and 2010). The same lowercase letters in the columns indicate that differences among the indexes were not significant (P > 0.05) for the different months in the same treatment. The same capital letters in the rows indicate that differences among the indices were not significant at P > 0.05 for the different treatments in the same month.