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《Scientia Agricultura Sinica》 2005-09
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Modelling the Relationship Between Summer Maize N,P,K Uptake and Yield on the Basis of Soil Fertility Indices

LIU Ming-qiang,YU Zhen-rong,LIU Yun-hui(College of Resource and Environmental Science,China Agricultural University,Beijing 100094)  
The QUEFTS (QUantitative Evaluation of the Fertility of Tropical Soils) model was calibrated for summer maize using the soil fertility data and fertilizer trials results at different sites in Huanghe-Huaihe-Haihe Plain.The essence of QUEFTS model takes into accoun of the interactions among nitrogen (N),phosphorus (P) and potassium (K).QUEFTS describes the relationship between soil parameters and yield in four steps:(1) assessment of the potential supply of N,P and K on the basis of chemical soil data;(2) calculation of the actual uptakes of N,P and K,as functions of the potential supplies determined in step 1;(3) designation of yield ranges as functions of the actual uptakes of N,P and K determined in step 2;(4) calculation of the ultimate yield estimate by combining the three yield ranges established in step 3.New equations were established in step 1.The relationships between N,P and K recovery fractions and their applied amount were established,respectively.The contents of minimum and maximum accumulation (kg grain·kg-1) of N,P,and K for summer maize are set to(21-64),(126-384)and(20-90),respectively.The simulated values showed a good consistence with the observed one.
【Fund】: 国家“863”计划项目资助(2003AA209030)
【CateGory Index】: S513
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