FIELD CHOPS. 



961 



in connection with these experiments. The yields ol)tained with different amoiinta 

 of irrigation water is shown in the following table: 



Volume of irrigation water in its relation to the yield of cane. 



Irrigation. 



One inch per week 



Two inches per week 



Three inches per week 



Two inches every two weeks. . . 

 Three inches every three weeks 



Cane per acre, 1903. 



Lahaina. 



Pounds. 

 146, 362 

 152, 866 

 160, 882 

 141,773 

 115, 579 



Rose 

 Bamboo. 



Pounda. 

 118, 425 

 130, 157 

 136, 778 

 121,349 

 118, 077 



Average weight of 

 cane. 



1901. 



Pounds. 

 308, 805 

 390, 080 

 285, 343 

 328, 657 

 226, 170 



1903. 



Pou7ids. 

 132, 393 

 141,511 

 148, 830 

 131,561 

 116, 828 



Average 



of 1901 



and 1903. 



Pounds. 

 220,599 

 265, 795 

 217, 086 

 230, 109 

 171,499 



Irrigation was discontinued when the rains were sufficient, and the volume of 

 irrigation water as given in the table simply means the maximum quantity applied 

 for the given period of time. Data with reference to soil moisture show that the 

 plat receiving 1 in. of irrigation water per week contained on an average 30.84 per 

 cent of water at 1 ft. in depth after irrigation, and 23.87 per cent before the next irri- 

 gation. The corresponding figures for the plats receiving 2 in. per week, 3 in. per 

 week, and 3 in. in 3 weeks were 30.62 and 26.83, 35.90 and 31.81, and 32.74 and 16.73 

 per cent, respectively. The highest percentage of moisture, 31 .38 per cent, was main- 

 tained in the plat irrigated at the rate of 3 in. per week, and the lowest, 27.43 per 

 cent, in the plat irrigated at the rate of 3 in. in 3 weeks. In 1901 the plat receiving 

 2 in. per week produced the largest yield, while in 1903 the plat receiving 3 in. per 

 week gave the best yield, but the total quantity of water received by the two plats 

 was very much the same. Lahaina cane gave the best results with 3 in. of water per 

 week and Rose Bamboo with 2 in. A series of tables is given showing analytical 

 results, together with the quantities of water used per acre and per pound of sugar 

 produced. Some of the data, being the averages for the 2 varieties, are shown in the 

 following table: 



Quantity of vater in its relation to the production of sugar and solid matter. 



Irrigation. 



Water used 

 per acre. 



One inch per week 



Two inches per week 



Three inches per week 



Two inches every two weeks . . . 

 Three inches every three weeks 



Gallons. 

 3,571,022 

 5, 118, 800 

 6, 666, 578 

 3, 652, 484 

 3, 733, 946 



Sugar pro- 

 duced 

 per acre. 



Pounds. 

 21,911 

 22, 889 

 23,992 

 22, 258 

 19,184 



Water per 



lb. of .«olid 



matter. 



Gallons. 

 39.9 

 58.2 

 71.0 

 41.0 

 46.5 



Three inches of water per week furnished 57 in. of water more to the crop than 

 2 in. per week, and the difference in yield of sugar amounted to 1,103 ll>s. This is 

 equivalent to a requirement of 1,403 gal. of water for every additional pound of 

 sugar produced under the heavier irrigation. A comparison of the results with 3 in. 

 and 1 in. of water per week shcjws that 1,487 gal. were required i)er jjound of 

 increa.se. The author states that while the larger volumes of water gave an increase 

 in sugar in these experiments, such increase would, under some conditions, be 

 obtained at a loss. 



The water-absorptive power of the station soil is given as 40.74 per cent, and at a 

 depth of 1 ft. the soil on the 3 in. per week plat contained on an average 77 per 

 cent of the water it couM hold. The average results of 18 irrigations show that at 

 1 ft. in depth the soil contained 25.65 per cent of moisture l)efore and 28.61 per 



