20 



BULLETIN 618, U. S. DEPAETMENT OF AGRICULTURE. 



to 25.6 bushels, while the 5-year average yields of four varieties 

 ranged from 11.2 to 13.7 bushels. This shows that in the event of 

 great damage to the winter-wheat crop in autumn or winter the loss 

 might be retrieved in a large measure by sowing durum wheat the 

 following spring. 



RESULTS AT MANHATTAN, KANS. 



Manhattan is located, according to Table II (p. 15), on a dark- 

 brown silt-loam soil at an altitude of 1,014 feet. The normal annual 

 rainfall, based on a 56-year record, is 32.6 inches. The experiments 

 were conducted independently by the Kansas Agricultural Experi- 

 ment Station, and the results are copied from Bulletin 144 (Ten Eyck 

 and Shoesmith, 1907) of that station. The results are shown in full 

 in Table IV and graphically in figure 8. 



Table IV. — Annual and average yields of two varieties of durum wheat and four varieties 

 of common wheat grown at the Kansas Agricultural Experiment Station, Manhattan, 

 Kans., during periods of varying length in the four years from 190S to 1906, inclusive. 







Y 



ield per acre (hv. 



shels). 





Class, group, and variety. 



1C03 



1C04 



1S05 



1606 



Average. 





2 vears, 



1903 and 



1904. 



3 years, 

 1904 to 

 1906. 



Durum: 



13.3 

 12.0 



11.1 

 7.0 



34.9 

 5.3 

 6.1 

 1.9 







12.2 

 9.5 





Velvet Don — Velvet Don • 



18.0 12. S 

 38.6 ! 46.9 



12.6 



Common: 



Crimean — Turkey (No. 4) 



40.1 





9.6 

 7.0 

 7.0 



7.5 

 6.6 

 4.5 





Bluestem — Haynes 



















Since Manhattan, like McPherson, lies in the heart of the Crimean 

 winter-wheat belt, the experiments are of brief duration, as not much 

 could reasonably be expected of spring-wheat varieties. Table IV 

 shows the comparative yields in the years 1903 and. 1904 of two 

 durum varieties and of three spring common wheats belonging to 

 three different groups. It is seen that both durums exceed any of 

 the spring common varieties in yield. Trie Turkey variety of the 

 Crimean winter group, however, outyields the best durum grown in a 

 ratio of 3 to 1. In the favorable year 1905, in which one of the 

 durum varieties was still under experiment, its high yield of 18 

 bushels was less than half that of Turkey, 38.6 bushels per acre. 



RESULTS AT LINCOLN, NEBR. 



The Nebraska Agricultural Experiment Station is located on an 

 alluvial clay-loam soil at an altitude of 1,189 feet above sea level. 

 The normal precipitation is 27.5 inches. The experiments at Lincoln 

 were conducted independently by the Nebraska Agricultural Experi- 



