The Effects of Long-term Fertilization on Crop Yield and Aqui-cinnamon Soil Organic Matter

Based on national supervision base for aqui-cinnamon soil fertility and fertilizer benefits in Changping,Beijing(1991-2004),the effect of long-term fertilization on crop yield and Soil organic matter.were investigated.The main results obtained are as follows:Compared with the check(CK,no fertilizer application) and single nitrogen fertilizer(N only),combined application of N and P(NP) significantly increased both biomass and grain yield of winter wheat by 400% and summer corn by 100%;Compared with NP,treatment,N only,combined appplication of P and K(PK),and combined application of N and K(NK),increased crop yield not significantly.The yield increament for winter wheat and summer corn follows the following order:NPK+pig manure(NPKM) or NPK + strawNPKNP.The content of soil organic matter(OM) of NPKM treatment was higher than that of single chemical fertilizer treatment significantly.In comparison with CK,soil OM with treatments of NPK+Straw,NPKM,NPK,NP and N only increased by 7.90%,14.56%,6.51%,5.89% and 2.56%,respectively.Therefore,balanced application of N,Pand K,and combined application of NPK with Crop yield and organic materials play a very important role in improving soil OM status.