198 



Table showing the 



Irrigation and Drainage 



highest probable duty of water for different yields per acre 

 of different crops 



This table must be regarded as showing the mini- 

 mum amounts of water which will bring the crops 

 named to full maturity so as to produce the yields speci- 

 fied under conditions of absolutely no loss by surface 

 or under -drainage, and where the evaporation from the 

 soil itself is as small as it can well be. It must be 

 further understood that the soil at seeding time already 

 possesses the needful amount of water for the best con- 

 ditions, and that at the end of the growing season it is 

 yet so moist that no check to vigorous, normal growth 

 has occurred. 



The figures in the table may, therefore, be regarded 



