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Generalization of Yield Equations in Two Variables: III. Application of Yield Data from 30 Initial Fertility Levels 1
Author(s) -
Voss Regis,
Pesek John
Publication year - 1962
Publication title -
agronomy journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.752
H-Index - 131
eISSN - 1435-0645
pISSN - 0002-1962
DOI - 10.2134/agronj1962.00021962005400030026x
Subject(s) - yield (engineering) , generalization , fertility , mathematics , soil fertility , fertilizer , series (stratigraphy) , greenhouse , regression analysis , agronomy , statistics , linear regression , polynomial regression , regression , soil water , soil science , environmental science , biology , mathematical analysis , demography , physics , population , paleontology , thermodynamics , sociology
Synopsis Restrictive second degree polynomial yield equations in N and P for oats grown in the greenhouse at each of 30 different initial fertility levels within one soil type were utilized in the application of a generalization procedure previously proposed in this series. A multiple regression model including N and P fertilizer and soil test levels plus all possible linear interactions gave good evidence that the yields from the different initial fertility levels belonged to the same general yield surface.