178 



Irrigation and Drainage 



In Fig. 30 is shown the difference between the corn on land 

 irrigated and not irrigated in 1895, when there was the largest ob- 



Fig. 30. Difference in yield between maize, thickly seeded, irrigated 

 and not irrigated, in a dry season. 



served difference in the yield. Fig. 23 shows the difference where 

 the rows are 44 inches apart instead of 'JO inches, as in the former 

 case. 



THE EFFECT OF SUPPLEMENTING THE RAINFALLL WITH 

 IRRIGATION ON THE YIELD OF CLOVER AND HAY 



The crop of hay is, perhaps, the one above all others among 

 the general farm crops which may be made to respond most effec- 

 tively to irrigation in humid climates. Indeed, it is the chief one 

 in Europe which has been grown by irrigation north of Italy 



