38 BULLETIN 430, U. S. DEPAETMENT OF AGEICULTUEE. 



Corn appears to be a very TUKjertain crop for grain at liigh- ielevations 

 in eastern Wyoming, according to the three years' results obtained 

 at Archer. It is probably the best crop to grow for silage or roughage, 

 however. 



BUCKWHEAT. 



Buckwheat has been grown on the Cheyenne Experhnent Farm in 

 each of the three years. Two varieties have been tested, the Tar- 

 tarian and the Mountain. Neither of these varieties appears to be 

 adapted to conditions such as prevail at Archer. Buckwheat is 

 unable to withstand drought, and hence all yields obtained have been 

 low, except in 1915, a season of high rainfall. The Tartarian is 

 about two weeks earlier than the Mountain variety. The yields in 

 the three years (1913 to 1915) are as follows: Tartarian, 1, 1.3, and 8 

 bushels per acre; Mountain, 5, 3.5, and 16 bushels per acre, re- 

 spectively. Buckwheat should apparently be grown in eastern 

 Wyoming only in an experhnental way. 



SUMMARY. 



The Cheyenne Experiment Farm is located on the plains of south- 

 eastern Wyoming at Archer, 8 miles east of Cheyenne. The eleva- 

 tion is almost exactly 6,000 feet. The station was estabhshed in 

 July, 1912, and experimental work was begun in the fall of that 

 year. The experiments reported herein, therefore, have continued 

 three years. 



The soil and climate are fairly typical of those of the district lying 

 to the eastward. The results obtained are applicable to southeastern 

 Wyoming and to adjacent small portions of Colorado, Nebraska, and 

 South Dakota. 



The soil is a light sandy loam, very productive when sufficient 

 moisture is available. Heavier soils occur to some extent in other 

 parts of the district. 



The average annual precipitation at Cheyenne during the past 

 16 years has been 15.78 inches. The average seasonal precipitation 

 (April to July, inclusive) during the same period has been 8.59 

 inches. 



The evaporation from a free water surface during the growing 

 season (April to July, inclusive) has been about 22.5 inches. The 

 summers are rather short, without excessive heat. Hot winds do 

 not occur. The average frost-free period is 125 days. 



Experiments with wheat show that winter-wheat varieties have 

 yielded higher than spring wheats in two years out of the three 

 during which experiments have been conducted. The Ghirka Winter 

 and Kharkof have been the highest yielding varieties. 



Rate-of-seeding experiments with the Ghirka Winter and Turkey 

 have given contradictory results during the three years. Four pecks 



