Abstract
The amount of soil inorganic N declined significantly with increasing of sampling depth and sampling time (P < 0.001). Compared with CK, application of untreated pig manure and slurry increased significantly the amount of soil inorganic N by 76.0% and 156.1%, respectively (P < 0.001). Compared with CK, application of untreated pig manure increased significantly the amount of soil NH4+-N by 33.7%, however, application of untreated pig slurry decreased remarkably that of soil NH4+-N by 7.4% (P < 0.001). Application of untreated pig manure and pig slurry increased significantly the amount of soil NO3--N by 86.9% and 198.0%, respectively compared with CK, (P < 0.001). Soil NO3--N accounted for the majority of soil inorganic N irrespective of fertilization treatment or sampling time, its percent were 80.13%, 84.27% and 92.63% in the CK, pig manure and pig slurry treatments, respectively. This result indicated that application of untreated pig manure and slurry increased significantly the amount of soil inorganic N, especially soil NO3--N, which occurred the potential risk of nitrate pollution.
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