EXPERIMEHTS WITH MARQUIS WHEAT. 
35 
The normal rainfall at these points is of little importance, since 
irrigation water is supplied. One effect of the abundant water 
supply, however, is to lengthen the period required by the plant to 
reach maturity. Hence, early varieties are desirable where the 
elevation is sufficient to shorten the frost-free period. The altitude 
at Newell, S. Dak., as shown in Table VIII, is 2,950 feet above sea 
level. The altitude at Huntley, Mont., is 3,000 feet. The altitude 
of Aberdeen, Idaho, shown in Table XX, is 4,400 feet, while Fallon, 
Fig. 10. — Diagram showing the average yields of the Marquis and the leading variety in each of several 
different groups of wheat under irrigation at four western stations in either two or three of the years 1913 
to 1915, inclusive. 
Nev., has an altitude of 3,965 feet. The growing season is of only 
medium length under these conditions. Sometimes it is much short- 
ened by the occurrence of early autumn frosts. Early-maturing 
varieties, therefore, are best adapted to the conditions obtaining at 
these stations. 
RESULTS AT NEWELL, S. DAK.' 
The experiments with wheat under irrigation at Newell, S. Dak., 
are conducted in cooperation with the Office of Western Irrigation 
Agriculture. Marquis wheat has been included in the varietal experi- 
ments during the 3-year period, 1913 to 1915, inclusive. The annual 
