564 Thirty-second Annual Report 



resigned as foreman March 30 and was succeeded May 1 by 

 Mr. Carl Clark, a 1916 graduate of the University of Arizona 

 College of Agriculture. 



The summer and fall of 1920 were unusually dry, and the 

 winter of 1920-21 and the spring of 1921 have likewise been 

 below normal in the amount of precipitation. Consequently, 

 we are starting the cropping season of 1921 under unfavorable 

 conditions. However, the ground has been carefully worked 

 and sufficient moisture has been stored to enable us to secure 

 good stands of all crops planted, and with a normal summer 

 rainfall we expect average returns for the present year. 



Silage produced and stored in the fall of 1920 was not 

 used for stock feeding experiments because of the high price 

 of feeder cattle and the probability of low markets later. The 

 silage was sold to a neighboring rancher. 



II. A CONTINUATION OF STUDIES AT THE SULPHUR SPRING VALLEY 



DRY-FARM 



The growing season of 1920 was the most severe one exper- 

 ienced in Sulphur Spring Valley since the establishment of the 

 Experiment Farm there. No grain yields of consequence were 

 secured from any of the plantings made in 1920, and not more 

 than 25 tons of silage were stored. Due to shortage of feed, 

 no stock feeding experiments were conducted in the winter of 

 1920-21. In 1920, even tepary beans failed to make a satis- 

 factory growth, which was the first failure of this crop recorded 

 in Sulphur Spring Valley. 



Conditions in the spring of 1921 have not improved over 

 those of 1920. Dry-farm fields do not have sufficient moisture 

 to cause germination of newly planted crops, consequently only 

 those fields that are supplied with some irrigation water have 

 been planted. 



III. LEGUMES AND THEIR CULTURE FOR SOUTHWEST CONDITIONS 



As in the previous year, plantings under this project were 

 made on the five farms of the Experiment Station. These plant- 

 ings covered experiments with velvet beans, soybeans, tepary 

 beans, cowpeas, vetch, and a few miscellaneous crops. On the 

 Salt River Valley Farm purple vetch made a larger and more 

 satisfactory growth than any other variety, but it failed to 

 set a good crop of seed. Hairy vetch made a very satisfactory 

 growth and produced a considerable quantity of seed. Woolly- 

 podded vetch made the third largest growth and produced a 

 reasonable amount of seed. Bitter vetch, which in other years 



