摘要
本文利用收集的黄淮海平原不同点肥料田间试验数据,对基于土壤肥力指标的夏玉米养分吸收和产量关系的土壤肥力评价模型QUEFTS进行了修正和验正。QUEFTS是基于土壤肥力指标的养分吸收和产量关系的半机理养分模型,模型最重要的特点是考虑到了氮、磷和钾3种养分之间的相互作用。模型计算包括4个部分:(1)土壤潜在供肥量计算;(2)作物氮、磷和钾实际吸收量计算;(3)产量范围的确定;(4)最终产量预估。模型第一步建立了新的计算公式,同时建立了养分表观利用率和施肥量之间的关系式,取代了原模型中表观利用率的常数项;第三步中将夏玉米籽粒最大和最小养分含量(kg·kg-1)分别校正为:氮21～64;磷126～384;钾20～90。通过验证,模型计算的氮、磷和钾养分吸收量及产量与实测值比较结果显著。
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）. QUEFFS 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.
出处
《中国农业科学》
CAS
CSCD
北大核心
2005年第9期1834-1840,共7页
Scientia Agricultura Sinica
基金
国家"863"计划项目资助(2003AA209030)
