60 



BULLETIN 823, U. S. DEPARTME]!irT OF AGRICULTURE. 



The ability of the Sixty-Day and Eierson varieties to yield, as well 

 as the midseason varieties and to mature 10 days to two weeks 

 earher gives a distinct advantage^ and they therefore are to be recom- 

 mended. 



RESULTS UNDER IRRIGATION. 



The Kierson and Sixty-Day oats are not extensively grown under 

 irrigation. As a rule, the larger and later maturing varieties are 

 grown, as they usually yield better. However, where the growmg 

 season is short the early varieties are desirable and often yield sur- 



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Fig. 13.— Diagram showing the average yields, in bushels per acre, of the highest yielding variety of each 

 of several groups of oats at seven agricultural experiment stations in the western basin and coast areas 

 during the periods of years indicated. 



prisingly well. Cooperative varietal experiments with EZherson and 

 Sixty-Day oats have been conducted under irrigation at Newell, 

 S. Dak., and Aberdeen, Idaho, for six and five years, respectively. 

 In addition, results of experiments with Kherson and Sixty-Day oats 

 under irrigation conducted independently by the Nevada and Mon- 

 tana agricultural experiment stations at Reno and Bozeman and at 

 the Gooding (Idaho) substation are presented herewith. 



The general physical conditions at these stations are shown in 

 Table XLIX. 



Under irrigation, precipitation naturally ceases to be a limiting 

 factor in crop production, and because of the availability of an ample 



