324 



THE IR RIG All ON AGE. 



Volume of the application. Schuyler and Allardt, in treating of 

 this subject under the conditions of the Hawaiian Islands, state that 

 *'it seems to be generally understood by all planters that the depth of 

 each watering, i. e., the volume of each application, shall be at the 

 least an average of 3 to 4 inches over the whole surface of the ground." 

 The same authors quote one of their witnesses assaying "11,000 cubic 

 feet per acre every seven days will produce the very best results 

 in growing sugar cane/' That volume is equal to 3 inches of water 

 over the whole ground per weekly application. Another example 

 from the same authority gives "10,890 cubic feet per acre to each 

 watering every seven days." This volume is equal to an application 

 of 3 inches of water over the whole ground once a week. When the 

 small rainfall was added to the amounts applied by irrigation upon the 



Mam Water Ditch 



FIG. 3. Irrigation of sugar cane on level land by direct discharge of the water from 

 the main ditch into the furrows. . 



plantation spoken of by Schuyler and Allardt, then the average appli- 

 cation per seven days over the stated period of fifteen months or 

 sixty- five weeks appeared as follows: 



DEPTH OF WATER APPLIED TO SUGAR CANE DURING SIXTY-FIVE WEEKS 



FALL AND IRRIGATION). 



