肥料三要素对六龄参根产量影响的数量分析

QUANTIFYING EFFECTS OF THE THREE ESSENTIAL ELEMENTS OF FERTILISER ON THE ROOT YIELD OF SIX-YEAR-OLD GINSENG

本文针对长白山区低肥力白浆土壤，在三因素五水平最优回归设计田间试验的基础上，应用多元统计分析的方法，建立了氮磷钾三种肥料对六龄参根产量影响的肥料效应数学模型。通过对此模型的数学分析，得知氮磷钾三种肥料对六龄参根的产量均有显著影响。其综合增产效应依次为NK＞N＞K＞P，而三种肥料的线性增产效应依次为N＞K＞P。当三种肥料在一定条件下单独使用时，其增产效应依次为N＞K＞P。同时确定了最高产量施肥量和最大利润施肥量，由等产线确定了合理施肥区。

Field experiment was conducted in an optimised regressional design with 3 factors of 5 levels each,To establish a mathematical model for quantifying the influence of nitragen,Phosphorus and potasium fertiliser on the root yield of six-year-old ginseng in the low-fertility lessive soil of Changbai Mountain Regions.Results showed that these three essential fertiliser clements all have significant influence on the root yield and their relative importance in yield increase are NK>N>K＞P for over-all effect and N>K>P for main effects.when each of the three elements is applied individually,The ranking for yield iucrease remains N＞M＞K＞P.The amount of fertiliser application for maximising both root yield and profit was determined,and the rational range of fertiliser application was finalised with the aid of yield-equality lines.