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A Comparison of Variance Components in Corn Yield Trials: II. Error, Year x Variety, Location x Variety, and Variety Components 1
Author(s) -
Sprague G. F.,
Federer W. T.
Publication year - 1951
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/agronj1951.00021962004300110003x
Subject(s) - variety (cybernetics) , unit (ring theory) , yield (engineering) , agriculture , mathematics , agricultural science , geography , biology , statistics , archaeology , materials science , mathematics education , metallurgy
THE development of commercially acceptable hybrids requires that the various types of hybrid combinations be evaluated in yield trials. Such trials are both costly and time consuming. The data obtained in any one year or at any one location or place are generally considered to provide an inadequate basis for general recommendations. This belief arises from the knowledge that varieties do not always respond alike when grown at different locations or in different years. The question as to the optimum number of replicates, years, and locations necessary to provide a safe guide has received very little attention. The present paper is an attempt to estimate the relative magnitude of the variety X location and variety X year components of variance to the error variance component and from these estimates obtain indications as to the most efficient use of a given amount of money available for conducting yield trials.