EXPERIMENTS WITH DURUM WHEAT. 
17 
RESULTS IN THE SUBHUMID PRAIRIE SECTION. 
The prairie section (fig. 8) includes the stations in Wisconsin, 
Minnesota, Iowa, eastern Kansas and Nebraska, and extreme eastern 
North and South Dakota. Nine stations which have experimented 
with durum wheat are located in this section. The names of these 
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Fig. 8.— Diagram showing the location of nine stations in the Prairie States and the average yield of the 
leading variety of durum and the leading variety of each of several different groups of common wheat at 
each station during the periods of years indicated: 1, Average of only four years (Preston at Fargo); 
2, average of only three years (Crimean at St. Paul and Crimean and Preston at Ashland); 3, average of 
only ten years (Crimean at Brookings); 4, average of only two years (Fife, Bluestem, and Preston at 
Manhattan). 
stations, their altitude, normal or average annual rainfall for a period 
of years, and the general soil type on which they are located have 
already been given in Table II. 
Experiments with durum wheat have been conducted at some 
other stations adjacent to the subhumid section on the east and 
14644°— 18— Bull. 618 3 
