在这篇文章中、笔者提出从实验数据确定Mitsherlich和Logistic方程中生长上限K的方法、即四点法和五点法。对Mitsherlich方程用公式: K=(y2yn-1-y1y_n)/(y2+yn-1-(y1+y_n)或 K=((y2m-y1y_n)((y2+yn-1)/2-(y1+y2)/2)+(ym-(y1+y_n)/2)(y2yn-1-y1y_n))/[2ym-(y1+y_n)][y2+yn-1)-(y1+y_n)]对Logjstic方程用公式: K=((y2yn-1(y1+y_n)-y1y_n(y2+yn-1)/y2yn-1-y1y_n或 k=(ym2(y1+y2)/2-y1ymy_n)(y2yn-1-y1y_n)/(ym2-y1y_n)(y2yn-1-y1y_n)+(ym2-y1y_n)(y2、yn-1(y1+y_n)/2-y1y_n(y2+yn-1/2(ym2-y1ym)(y2yn-1-y1y_n)其中,y1y2,ym,yn-1和y_n为试验点X1,X2,Xm,Xn-1和Xn处的对应值(m=n(n+1)/2)