There were marked differences in soil C / N ratio among.Different treatments due to fertilizer application (Figure5). The.Average C / N ratio in the OM treatment (10.98) was obviously.Higher than the other treatments (,, P 0.05 Fig.5). Similarly in SR,,Treatment the, C / N ratio was significantly higher than CK.Nevertheless there were, no significant differences of C / N ratios in.The, CK SR GM and, NPK treatments ranging from, 9.66 to.10.00.Dynamics of soil C / N ratios during 1998 - 2009 are shown in.Fig.6. From 1998, to 2003 the C / N ratios increased sharply in.OM and GM treatments (25.0%and 17.9% higher than the initial.Amount), and then the values declined slowly and constantly till.2007 (reaching 10.14 and 8.98 respectively). However the other,,Treatments including CK SR and, NPK fluctuated at a stable level.(approximately 10.0) from 1998 to 2007. In the last two years of.The, experiment period all the five treatments displayed similar.Trends without a significant difference varying slightly between.8.98 and 11.29.
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