CROPS UNDER FALL IRRIGATION AT SCOTTSBLUFF. 17 



(3) These experiments included wheat, oats, barley, potatoes, 

 sugar beets, and corn. Three years' results have been obtained with 

 wheat, oats, and barley, and two years' results with potatoes, sugar 

 beets, and corn. 



(4) With very few exceptions, higher yields of each crop were ob- 

 tained each year from the land which was fall irrigated than from 

 adjacent land which was not fall irrigated. Considering the average 

 results of three years, fall irrigation increased the yield of wheat 19 

 per cent, of barley 23 per cent, and of oats 15 per cent. In the aver- 

 age results of two years, fall irrigation increased the yield of corn 22 

 per cent, of sugar beets 15 per cent, and of potatoes 2 per cent. The 

 average increase in the yield of the six crops on fall-irrigated land was 

 16 per cent. 



(5) With the exception of potatoes, the yields of all the crops were 

 increased by fall irrigation sufficiently to more than pay for the cost 

 of the fall irrigation. 



(6) Soil-moisture studies made on the wheat plats in 1911 showed 

 that the fall-irrigated land contained more soil moisture to a depth 

 of 6 feet throughout the season than the land not fall irrigated. The 

 greatest differences in soil moisture were found in the lower depths 

 of soil, particularly the sixth foot, which contained from 3 to 9 per 

 cent more moisture on the fall-irrigated land than on the land not 

 fall irrigated. 



(7) The difference in soil-moisture content during the growing sea- 

 son appears to have been due to the fact that the land which was not 

 fall irrigated was comparatively dry at planting time in the spring 

 and that it consequently absorbed water less readily than the fall- 

 irrigated land, which was well supplied with moisture at the begin- 

 ning of the season. 



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