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《Journal of Anhui Agricultural Sciences》 2010-16
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Effects of Long-term Different Fertilizations on Nitrogen in Red Paddy Soil

YUAN Ying-hong(Nanchang Institute of Technology,Nanchang,Jiangxi 330099)  
A long-term field experiment was set in Jinxian county,institute of red soil in Jiangxi Province(116°20′24″ E,28°15′30″ N).One of the aims of the experiment was to study effects of long-term different fertilizations on nitrogen in red paddy soil.Treatments were:(1) Zero fertilization(CK),(2) chemical fertilizers alone(NPK),(3) organic fertilizers alone(M) and(4) a combination of chemical and organic fertilizers(NPKM).Results showed contents of total nitrogen,available nitrogen,ammonium nitrogen,nitrate nitrogen,microbial biomass nitrogen in red paddy soil decreased with the increasing of soil depth.Contents of total nitrogen,available nitrogen,ammonium nitrogen,nitrate nitrogen,microbial biomass nitrogen at same horizon in different fertilizations decreased in the sequence of NPKMMNPKCK.Long-term application of organic fertilizer or combination of organic and inorganic fertilizer promotes increasing of total nitrogen,available nitrogen,ammonium nitrogen,nitrate nitrogen,microbial biomass nitrogen in red paddy soil.It is obvious that NPKM increased soil fertility and enhanc the nitrogen supplying capability of paddy soils.There was extremely significant linear positive correlation between available nitrogen,ammonium nitrogen,nitrate nitrogen,microbial biomass nitrogen and total nitrogen in A,P horizons of red paddy soil.Therefor,combination of organic and inorganic fertilizer can promote increasing the content of nitrogen composition prominently,which was basic approach to increasing the fertility of soil nitrogen.
【Fund】: 江西省教育厅科技计划项目(GJJ08458)
【CateGory Index】: S158
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