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The Resistance of Certain Varieties and Regional Strains of Alfalfa to Controlled Low Temperatures 1
Author(s) -
Timmons F. L.,
Salmon S. C.
Publication year - 1932
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/agronj1932.00021962002400080007x
Subject(s) - agriculture , resistance (ecology) , agricultural experiment station , citation , state (computer science) , principal (computer security) , agricultural science , political science , agronomy , horticulture , mathematics , geography , biology , computer science , law , archaeology , algorithm , operating system
During the last 3o years extensive experience and a considerable number of experiments have shown marked differences in the adaptation of different varieties and strains of alfalfa. In general, Grimm and other variegated varieties and strains have proved best in northern regions, while yarious strain,s of common alfalfa or of the non-hardy group (Peruvian) are better adapted to the central and southern areas. It is reasonable, to suppose ttiat differences in adaptation are correlated with resistance to low temperature. Indeed, it is well known that adaptation in many cases is limited primarily to inability to survive severe winters and hence presumably by susceptibility to freezing temperatures. In a few cases differences in resistance to winter killing and to low temperatures have been experimentally demonstrated. In connection with other work of a similar nature at the Kansas Station, it seemed desirable to make a more extensive study of this relation in order to determine whether or to what extent resistance to low temperatures is a factor of major importance in determining the adaptation of alfalfa varieties and whether artificial freezing may be usefully employed in determining the -relative resistance of varieties and strains to winterkilling.