Evaluation of Fluvo-aquic Soil Fertility Quality with the Method of Principal Component Analyses

Based on the long-term location monitoring of fluvo-aquic soil fertility in Henan,the soil physical and chemical characteristics were measured.The organic matter,total nitrogen,total phosphorus,slowly-available potassium,available nitrogen,available phosphorus,available potassium and pH value(eight indexes)were chosen as evaluation indexes in principal component analyses.The results showed that fluvo-aquic soil fertility quality of eleven treatments was 1.5 MNPKMNPK,MNPK(2),SNPKNPKNK,PK,NPO,CK,N(O represented soil abandoned and no fertilizer;M,N,P,K and S separately represented nitrogen,phosphorus,potassium,organic matter and corn stock).The results were the same as those by cluster analysis on the whole.The results of principal component analyses could reflect soil fertility more scientifically and comprehensively.