14 



BULLETIN 133, U. S. DEPARTMENT OF AGRICULTURE. 



Table VIII. — Results obtained with potatoes onfall-irrigated land (Series VI) and on 

 land not fall irrigated (Series VII) at the Scottsbluff Experiment Farm in 1912 and 

 1913. 



Year and plat. 



Yield per acre (bushels). 



VI. 



VII. 



1912. 

 Platl. 



120.0 

 122.0 



118.0 



Plat 12 



121.0 









121.0 



119.5 







1913. 

 Plat 5 



137. 

 120.0 



129.0 



Plat 10 



121.0 









128.0 



125.0 









124.5 



122,2 









+ 



2.3 







SUMMARY OF ALL CROPS. 



The more important figures previously given in connection with the 

 six crops included in the experiment are briefly summarized in Table 

 IX. This table states the number of years results have been secured 

 with each crop, the number of plats which have been devoted to each 

 crop during the period, the average yields of potatoes and sugar beets, 

 and the average grain yields of the grain crops. The differences in 

 favor of fall irrigation are also stated. In order to show the relative 

 effect of fall irrigation on the six different crops, the yields given in 

 the first part of the table are stated in percentages in the last three 

 columns, where the yields obtained on the land which was not fall 

 irrigated are considered as 100 per cent in each case. As in the pre- 

 ceding tables, the figures in the columns headed "VI" relate to fall- 

 irrigated land and those in the columns headed "VII" relate to the 

 land which received no fall irrigation. 



Table IX. — Average and relative yields of six crops on fall-irrigated land (Series VI) and 

 on land not fall irrigated (Series VII) at the Scottsbluff Experiment Farm. • 





Number 

 of years. 



Number of 

 of plats. 



Unit of 

 yield. 



Average yield per acre. 



Relative yield per acre 

 (per cent). 



Crop. 



VI. 



VII. 



VI. 



VII. 



Gain by 

 fall irri- 

 gation. 



VI. 



VII. 



Gain by 

 fall irri- 

 gation . 



Wheat 



Barley 



Oats 



3 8 



3 1 8 

 3 8 

 2 4 

 2 5 

 2 4 



8 

 8 

 8 

 4 



5 



Bushel 



...do 



...do 



...do 



Ton 



Bushel 



33.3 

 36.9 

 83.8 

 59.1 

 12.3 

 124.5 



27.8 

 29.9 

 72.8 

 48.5 

 10.7 

 122.2 



5. 5 

 7.0 

 11.0 

 10.6 

 1.6 

 2.3 



119 

 123 

 115 

 122 

 115 

 102 



100 

 100 

 100 

 100 

 100 

 100 



19 

 23 

 15 





22 



Sugar beets. . . 

 Potatoes 



15 

 2 









116 



100 



16 





ill i 





