r 



428 THE SMALL GRAINS 



that an excess application above this amount, though of 

 little or no use to the crop, is not likely to be as harmful 

 to oats as it proved to be to spring wheat. In 3 of the 

 4 years the crop was grown on raw sagebrush land and 

 Lincoln and Big Four were the varieties employed. 



The results of the barley experiments indicated that 

 If acre-feet of water, in 4 good applications, is satisfac- 

 tory for the irrigation of that crop. The maximum irri- 

 gation delayed maturity 3 days. The plants which 

 received the most water were 3 inches higher than those 

 which received the least. Moravian White and Cali- 

 fornia Feed were the varieties used. 



461. Duty of water in Wyoming. In experiments 

 at the Wyoming Experiment Station, on 6 plats of 

 barley given different quantities of water, the highest 

 acre-yield, 35.32 bushels, was secured from a plat receiv- 

 ing 19.56 inches, in 3 irrigations. It was concluded that 

 best results are secured in irrigation of barley when 16 

 to 20 inches of water is applied in addition to the pre- 

 cipitation. In other experiments at this station it was 

 found that the best yield of oats to the acre-inch of water 

 used was secured with a depth of water of 15 to 18 inches, 

 including the rainfall. 



462. Duty of water in Utah. At the Utah Experi- 

 ment Station, the best yields of wheat and oats to the 

 acre were secured with 30 inches of irrigation water, the 

 yields decreasing when more was applied. Results of 

 other experiments at this station indicate that the largest 

 yield of grain is produced when there is a heavy irriga- 

 tion at heading time, with light irrigations earlier. The 

 reverse condition is true as to the weight of straw, which 

 is greater when the first irrigation is heavy and the last 

 one light. 



