152 



CORN CROPS 



sive and must be disposed of in some way, as by drainage, 

 run-off, or evaporation. 



Even though the crop requires a relatively small pro- 

 portion of the total rainfall, the crop often suffers due to 

 the fact that this small proportion is required during a com- 

 paratively short period and in excess of the water-storing 

 capacity of the soil. 



Lyon and Fippin^ give the following statement regarding 

 the water-holding capacity of some soils : — 



TABLE XXXIV 



Light 



loam 

 Silt loam 

 Clay . 



sandy 



Water Capacity 



Amount of Avail.able Water 



Minimum 

 Per Cent 



3 

 15 



Mnximum 

 Per Cent 



8 

 25 

 40 = 



Per Cent 



5 



10 



17 



Cu. in. per 

 Cu. ft. 



122 

 218 



27-4 



Inches per 

 Acre, 4 ft. 



3.4 



6.0 



7.6 



Studies at the Nebraska station indicate the water 

 requirements of a 50-bushel corn crop for the different 

 months to be about as follows : — 



