192 



Irrigation and Drainage 



inches of water added by irrigation only increased the grain yield 

 3.64 bushels per acre on the thinnest seeding, appearing to show 



Fig. 32. Maize, irrigated and not irrigated, four stalks in a hill, 

 middle section not irrigated. 



that for this soil and rainfall there was very nearly the right num 

 ber of plants in the row. 



Fig. 33. Maize, irrigated and not irrigated, three stalks in a hill, 

 middle section not irrigated. 



In regard to the yields from the thicker seeding, it must be 

 said that it does not follow from the experiments that they might 

 not have been quite different if, in the application of water to the 

 several plots, the amounts had been made proportional to the 

 number of plants growing on the area ; for it may fairly be pre- 



