390 



THE SMALL GRAINS 



substation it is found that " a summer fallow once in every 

 3 to 4 years may in the long run prove beneficial," but 

 that " a summer fallow every other year is unnecessary. 

 The results of 3 years indicate that wheat yields after 

 field peas are about as high as after summer fallow." 



FIG. 125. Summer tillage in Utah. 



415. Summer tillage in Utah. Cardon (1915, pp. 37- 

 39) reports results of a ten-years trial of continuous crop- 

 ping of winter wheat, in comparison with 2 crops of the 

 same and 1 of fallow in 3 years, alternate cropping, and 

 1 crop and 2 fallows in 3 years, at the Nephi, Utah, sub- 

 station. The total acre yields for 10 years, by the 

 different methods, in the order above given, were 112.19 

 bushels, 98.76 bushels, 98.16 bushels, and 65.27 bushels, 

 respectively. Though the total acre yield of 10 suc- 

 cessive crops, in this instance, was nearly 14 bushels 

 more than that from alternate cropping, it was 

 reckoned that the cost of growing and harvesting wheat 



