34 CIRCULAR 421, XJ. S. DEPARTMENT OF AGRICULTURE 



Rainbow Flint produced by far the highest yield of any variety 

 of corn tested. This variety does not mature grain regularly at Ard- 

 more, but acclimated strains mature sufficiently to make a good qual- 

 ity of silage. Of the varieties of corn that mature, Northwestern 

 Dent, Mercer Flint, and Payne White Dent were about equally pro- 

 ductive. These earlier maturing varieties contained a slightly higher 

 proportion of dry matter than Rainbow Flint, and probably con- 

 tained a higher percentage of grain. The much higher yield of Rain- 

 bow Flint more than compensates for this difference. 



Minnesota 13 produced yields of silage somewhat higher than those 

 of the early varieties, but it always was immature when harvested. 



The air-dry matter present in the corn when harvested for silage 

 was determined during the 6 years, 1926-31. While the green weight 

 of Rainbow Flint was 44 percent higher than that of Northwestern 

 Dent the air-dry matter was 39 percent higher. 



MILLET VARIETIES 



Millet varietal tests were conducted from 1915 to 1931 with the ex- 

 ception of 3 years. Sorgo and Sudan grass in 7-inch drills, the plant- 

 ing method used for the millet varieties, were grown in comparison 

 with the millets. During the period 1915-20 these tests were con- 

 ducted by the Office of Alkali and Drought Resistant Plant Breeding 

 Investigations. Results are shown in table 15. 



