122 



Journal of Agricultural Research 



Vcl. X. No. 3 



At the seventh and ninth feet of the unmanured plots, the cropped 

 soil had more moisture than the fallow, while on the manured plots the 



cropped exceeded the 



Percentage, of 

 different 



m o isfure 



r r I go f I o ns 



^th 



rallow ^^Cropped 



Fig. s-— Diagram showing the effect of different quantities of irriga- 

 tion water on the distribution of soil moisture in the fall on cropped 

 and fallow plots to a depth of lo feet. Average of three years. 



fallow in the eighth, 

 ninth, and tenth feet. 

 Manuring did not have 

 as marked an effect on 

 the moisture in the 

 fallow soil as it did in 

 the cropped. 



EFFECT OF DIFFERENT 

 QUANTITIES OF IRRI- 

 GATION WATER 



Distribution in the 



Fall 



The aata for this 

 test on the effect of 

 different quantities of 

 irrigation water on the 

 soil moisture are from 

 the experiment o n 

 cropping and fallowing 

 under irrigation con- 

 ditions. 



In figure 5 is shown 

 the fall distribution of 

 moisture after no irri- 

 gation and the appli- 

 cation of 5, 20, and 40 

 inches of water in crop- 

 ped and fallow plots 

 to a depth of 10 feet. 

 From the figure it will 

 be noticed that the 

 moisture in both the 

 fallow and cropped 

 soils increased with in- 

 creased irrigation, and 

 that the difference be- 



tween the moisture in the fallow and the cropped soil decreased with the 

 increase in irrigation. 



Where no water was applied, the moisture in the cropped plots de- 

 creased with depth to the fourth foot and then increased. In the cropped 



