CEREAL EXPERIMENTS AT THE AKRON FIELD STATION. 33 
was 18.7 bushels, produced in 1913. The lowest yield, 11.7 bushels, 
was produced in 1915. The average yield in the five years, 1911 to 
1915, inclusive, was 15.4 bushels. Because of the fact that some of 
the sorgos, or saccharine sorghums, produce as much grain and in 
addition yield more forage, grain sorghums can not be recommended 
to farmers of this district at the present time. Farther south and 
east, milo and dwarf milo are well adapted. 
SUMMARY. 
Cooperative experiments with cereals have been conducted at the 
Akron Field Station during the eight years, 1908 to 1915, inclusive. 
_ The station is located in the north-central part of Washington 
County, in northeastern Colorado, at an altitude of approximately 
4,560 feet. 
The average annual precipitation in the 11 years, 1905 to 1915, 
inclusive, was 19.72 inches. The average seasonal rainfall (March to 
July, inclusive) was 12.33 inches. About two-thirds of the rainfall 
occurs during the growing season. | : 
The average evaporation from a free water surface during the six 
months from April to September, inclusive, for the 8-year period, 
1908 to 1915, inclusive, was 42.08 inches. The average precipitation 
in the same pane was 14.11 inches. 
The average hourly wind velocity during the tiénths from April to 
September, inclusive, for the eight years was 7.1 miles. 
The average lone of the frost-free period for the eight years was 
136 days. The average date of the last killing frost in spring was 
May 13, and of the first killing frost in autumn, September 26. 
The soil of the Akron Field Station is a fine sandy loam. 
The cereals tested on field plats have included 17 varieties and 
strains of winter wheat, 44 of spring wheat, 16 of oats, 19 of barley, 
and one or more of each of the minor cereals, rye, emmer, flax, proso, 
and grain sorghums. 
Winter wheat has given better results than spring wheat. The 
durum wheats have produced higher average yields than spring 
common wheats. 
Crimean winter wheat (C. I. No. 1436) produced the highest average 
yield of any winter wheat tested during the eight years, 1908 to 
1915, inclusive, namely, 22 bushels. The Kharkof variety (C. I. 
No. 1583) ranks second, with 21.6 bushels. 
Pelissier durum wheat (C. I. No. 1584) produced 22.4 bushels, the 
highest average yield of any spring wheat in the eight years, 1908 to 
_ 1915, inclusive. The Velvet Don (C. I. No. 1445) was second, with 
a yield of 21.5 bushels, and the Arnautka (C. I. No. 1493) third, with 
