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Effect of the Method of Combining the Four Inbred Lines of a Double Cross of Maize upon the Yield and Variability of the Resulting Hybrid 1
Author(s) -
Eckhardt Robert C.,
Bryan A. A.
Publication year - 1940
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/agronj1940.00021962003200050005x
Subject(s) - agricultural experiment station , yield (engineering) , agriculture , agricultural science , citation , division (mathematics) , agronomy , political science , mathematics , library science , biology , computer science , geography , arithmetic , archaeology , physics , thermodynamics
L~ scale production of inbred lines from several varieties of corn was begun at the Iowa Agricultural Experiment Station in ~922. Hundreds of lines were started, the majority of which have been discarded, but a number of good ones have been produced from each of the varieties. The task remains of combining the best of them to produce the most desirable hybrid combinations. Even with relatively few lines, making and testing of all possible hybrid combinations is a staggering task. Thus with only 4o inbreds, 78o single crosses and 274, ~ 70 double crosses are possible. This paper reports the effect upon the yield and variability of two methods of making double crosses among lines from different varieties.