CROPS UNDER FALL IRRIGATION AT SCOTTSBLUFF. 



15 



As shown in Table IX, the average yields of all six crops were higher 

 on fall-irrigated land than on land which was not fall irrigated, the 

 average increase having been 16 per cent. 



SOIL-MOISTURE STUDIES. 



The soil-moisture conditions on the three wheat plats in each series 

 were studied during the season of 1911. A 6-foot boring was taken 



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Fig. 2. — Average moisture content of soil to a depth 

 of 6 feet on three wheat plats on fall-irrigated 

 land and three wheat plats on land not fall 

 irrigated at the ScottsblufE Experiment Farm, 

 1911. 



Fig. 3 . — Average mo istur e content o f so il t o a depth 

 of 3 feet on three wheat plats on fall-irrigated 

 land and three wheat plats on land not fall 

 irrigated at the Scottsbluff Experiment Farm, 

 1911. 



from each of the three plats in each series seven times during that 

 season, and the moisture content of each 1-foot section of soil was 

 determined. The wheat plats on both series were irrigated twice 

 during the season of 1911, on June 10 and July 5 and 6, and the plats 

 in Series VI had been irrigated in the fall of 1910, as previously stated 



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Fig. 4. — Average moisture content of surface foot of 

 soil on three wheat plats on fall- irrigated land and 

 on three wheat plats on land not fall irrigated at 

 the Scottsbluff Experiment Farm, 1911. 



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Fig. 5. — Average moisture content of the sixth foot 

 of soil on- three wheat plats on fall-irrigated land 

 and on three wheat plats on land not fall irrigated 

 at the Scottsbluff Experiment Farm, 1911. 



The moisture content of the soil on the seven sampling dates is shown 

 in figures 2, 3, 4, and 5. The average moisture content of the first 

 6 feet is shown in figure 2 and that of the first 3 feet in figure 3, while 

 figures 4 and 5 show the moisture content of the first foot and sixth 

 foot, respectively. 



As shown in figure 2, the average moisture content of the first 6 

 feet of soil was higher throughout the season on the fall-irrigated 



