…In this way, the effect of a certain factor gradually decreases as the amount of the factor increases. E. A. Mitscherlich formulated this mathematically in 1909 as dy / dx = k ( A - y ) ( y is the yield, x is the amount of the factor, A is the maximum yield, and k is a constant indicating the rate of effect). This formula shows that the ratio dy / dx of the increase in a certain factor dx to the increase in yield dy is proportional to the difference between the yield y at that time and the maximum yield A when there is a sufficient amount of the factor. From this, the formula y = A (1 - e - kx ) is derived, and the relationship between y and x is roughly the curve shown in the figure. … *Some of the terminology explanations that mention "Mitscherlich, EA" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…このように,ある因子の効果が因子の量の増加に伴って漸次低下していくことをいう。 ミッチャーリヒE.A.Mitscherlichは1909年にこれを数式化して dy/dx=k(A-y)とした(yは収穫量,xは因子の量,Aは最大収穫量,kは効果の率を示す定数)。この式はある因子の増加分dxと収穫量の増加分dyの比dy/dxは,そのときの収穫量yと因子が十分にあるときの最大収穫量Aとの差に比例するということを示すもので,これからy=A(1-e-kx)という式が導かれ,yとxの関係はほぼ図に示すような曲線になる。… ※「Mitscherlich,E.A.」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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