. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 44 BULLETIISr 428, U. S. DEPARTMENT OF AGRICULTURE, The summary of results at Brookings and Highmore indicates the superior hardiness of Medicago falcata at these points, while Table V indicates that factors other than low temperature were responsible for winterkilling., While the number of plants upon which the percentage of sur- vival shown in Table IV was based is too small to make the data really dependable, the appearance of the plantings at Highmore was very convincing. The rows of Turkestan, North Sweden, Cossac
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 44 BULLETIISr 428, U. S. DEPARTMENT OF AGRICULTURE, The summary of results at Brookings and Highmore indicates the superior hardiness of Medicago falcata at these points, while Table V indicates that factors other than low temperature were responsible for winterkilling., While the number of plants upon which the percentage of sur- vival shown in Table IV was based is too small to make the data really dependable, the appearance of the plantings at Highmore was very convincing. The rows of Turkestan, North Sweden, Cossack, and Cherno were so depleted as to give the entire block an extremely ragged appearance, while the rows of Medicago falcata adjoining had so nearly the full quota of plants that the mass effect remained unbroken. (Figs. 18 and 19.) Widely spaced hill plantings, such as were made at Highmore, in some respects offer very good opportunity for studying winter- killing, since on such plantings the effect of the important factors is greatly exaggerated. In row plantings and even in broadcast stands at Highmore the mortality of the Medicago sativa varieties. Pig. 18.—Hill plantings of Medicago falcata varieties, Jlf. sativa, andJf. sativaX falcata, commercial varieties and selections. Photographed in August, 1910, Highmore, S. Dak. was slight, while it was almost negligible in the case of the Medicago falcata strains. At Brookings the only winterkilling of Medicago falcata which could be considered of any consequence occurred dur- ing the season of 1912-13. The mortality in this case was doubtless due to the presence of an ice sheet over a portion of the plats. It is well recognized that Brookings and Highmore are not ideal places at which to test the comparative hardiness of alfalfas; nevertheless, at the latter point winterkilling is a serious factor in common alfalfa under field conditions. Georgeson {23) reports Medicago falcata to be the hardiest of all the alfalfas tested in
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