The basis for the improvement of American wheats . 7Tijhrid2. hihrid miihrid5 Hrjhrid 6 Hubrid 7 Fig. 3.—Diagram showing pedigree of one of the Gartons hybrid wheats. As already shown in the earlier part of this bulletin, wheat is. ofall the principal cultivated crops, probably the most influenced by itsenvironment. Connect with this the fact also of its close self-fertiliza-tion, and it is readily explained why there are so many diflerent varie-ties, each best adapted to its particular district. The same varietytaken to localities characterized by widely diflerent conditions willgradually cha
The basis for the improvement of American wheats . 7Tijhrid2. hihrid miihrid5 Hrjhrid 6 Hubrid 7 Fig. 3.—Diagram showing pedigree of one of the Gartons hybrid wheats. As already shown in the earlier part of this bulletin, wheat is. ofall the principal cultivated crops, probably the most influenced by itsenvironment. Connect with this the fact also of its close self-fertiliza-tion, and it is readily explained why there are so many diflerent varie-ties, each best adapted to its particular district. The same varietytaken to localities characterized by widely diflerent conditions willgradually change to suit the new conditions, thus giving origin to dif-ferent strains. At the same time new hybrids, when well flxed. arenot likely to be broken up by subsequent natural crosses, as in the case ^For an interesting account of some of itimpaus work, written by himself, seeKreuzimgsproduktelandwirthHchaftlicherKulturpflanzen. LandwirthschaftlicheJahrbiicher, Bd. XX, S. 335-371 (lUiis.), 1S91. 76 of some other species. It is important, therefore, that all
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