EXPERIMENTS WITH DURUM WHEAT. 59 



Section 1 of Table XXXIII shows the actual average acre yields 

 obtained from each wheat. Section 2 shows the same data expressed 

 in percentages. The yield of the best durum variety is taken as 100 

 per cent in each case. The data in this table are the same as those 

 shown graphically in figures 8, 12, and 13. 



The actual performance is seen more readily in the first section of 

 the table, where yields are given in bushels per acre. The compara- 

 tive performance, which indicates in large measure the comparative 

 value, is seen much more readily in the second section of the table, 

 where the results are expressed in percentages. After the detailed 

 presentation of these data in Tables III to XXXII, inclusive, only a 

 brief summary seems necessary. 



THE SUBHUMID PRAIRIE AREA. 



In studying the summarized results from the nine stations in the 

 subhumid prairie area, certain facts stand out plainly, as will be seen 

 in Table XXXIII. 



(1) In general, the durum wheats are not adapted to the humid 

 conditions often obtaining in the eastern part of this area, but they 

 do comparatively well in the subhumid northwestern part. 



(2) In the southern part of the prairie area, which includes the 

 eastern portions of Kansas and Nebraska, neither durum nor common 

 spring wheats do well. 



(3) Wherever the hard red winter wheats of the Crimean group can 

 be grown they greatly outyield any spring wheat. 



(4) In the northeastern portion of this area, under the conditions 

 obtaining at Ashland, Wis., and St. Paul, Minn., winter wheat is 

 reaching the northern limits of its present culture and is not so out- 

 standingly superior. The durum wheats are equal in jield to some 

 of. the common wheats and poorer than others. The value of the 

 durums will depend on the quality of their grain and the need which 

 exists for their rust resistance. 



(5) In the northwestern portion of this area, including the western 

 part of Minnesota and the eastern parts of the Dakotas, the durum 

 wheats have a much higher comparative value. They largely out- 

 yield the spring common wheats and nearly equal winter wheat in the 

 districts where it can be grown at all. 



(6) Of the varieties of durum wheat tested Arnautka is best 

 adapted for growing in western Minnesota and the eastern portions of 

 the Dakotas. 



THE GREAT PLAINS AREA. 



A study of the summarized results from 15 stations in the Great 

 Plains area, shown in part in Table XXXIII, supports the following 

 conclusions : 



(1) Durum wheats produce very well in all but the southern 

 part of this large area. 



