40 



BULLETIN 157, U. S. DEPARTMENT OF AGRICULTURE. 



corn, peas, and potatoes were planted in rows far enough apart to 

 permit intertillage, the cultivation during the summer being prac- 

 tically the same for the cropped and the fallow plats. The corn and 

 peas were drilled in rows about 35 inches apart, while the potatoes 

 were dropped behind a plow in hills 24 inches apart in rows 3 feet 

 apart. 



After the crops were harvested from these plats in the usual manner 

 in the fall, winter wheat was sown on them and on the fallow plat at 



D/)yS SAMPLED 

 Fig. 21.— Graphs showing the average percentage of moisture in the first 6 feet of soil at the beginning 

 and at the end of each season, as found in the rotation experiments at the Nephi substation, 1908 to 

 1913, inclusive. 



the same rate and on the same date. The subsequent treatment of 

 the plats was identical in every respect. 



MOISTURE CONTENT OF THE SOIL. 



Soil-moisture determinations were made on the plats in the rota- 

 tion during each year of the test. The plats growing wheat were 

 sampled at the beginning, in the middle, and at the end of each 

 season, while the other plats were sampled about once a month during 

 the season. The moisture content of each foot of soil to a depth of 

 6 feet was determined in the usual manner. 



The results indicate that there was very little difference in the 

 moisture content of any foot of soil on the different plats. The varia- 



