Abstract: Based on national supervision base for aqu-i cinnamon soil fertility and fertilizer benefits in Changping,Beijing( 1991- 2004) , the effect of long-term fert ilization on crop yield and Soil organic matter. were invest igated. Themain results obtained are as follows: Compared with the check( CK, no fertilizer applicat ion) and single nitrogen fertilizer(N only) , combined applicat ion of N and P( NP) significantly increased both biomass and grain yield of winter wheat by400% and summer corn by 100% ; Compared with NP, treatment , N only, combined appplication of P and K( PK) , andcombined application of N and K( NK) , increased crop yield not significantly.The yield increament for winter wheat andsummer corn follows the following order: NPK+ pig manure( NPKM) or NPK + straw> NPK> NP. The content of soilorganic matter(OM) of NPKM treatment was higher than that of single chemical fertilizer treatment significant ly. In comparisonwith CK, soil OM with treatments of NPK+ Straw,NPKM, NPK, NP and N only increased by 7190% , 14156%,6151%, 5189% and 2156%, respectively. Therefore, balanced application of N, Pand K, and combined applicat ion ofNPK with Crop yield and organic materials play a very important role in improving soil OM status.

Key words: Aqu-i cinnamon soil, Long-term fertilizer experiment, Crop yield, Soil organic matter

CLC Number: 

• S158