FIELD OEOPS. 359 



loss in moisture ranged from 1.87 percent to 6.29 per cent, while in the fourth there 

 was a gain of 0.48 per cent. In baking tubers of 3 varieties the loss in moisture 

 ranged from L2.79 to 20.76 percent. 



The investigations on the depth and time of planting, and the temperature of the 

 air and of the soil in their relation to quality, pointed oul that the seed should be 



planted 5 to 6 inches deep in good soil, in order to provide r n enough between 



the Beed and the Burface of the ground for the development of the number of tubers 

 the plant is capable of producing. The tubers growing from l '. to l in. deep were 

 of more uniformly good quality than those growing either deeper or shallower. The 

 results seemed to shovi thai good quality is developed under a uniform soil tempera- 

 ture of 65 to 7-"- . 



It was further found thai long tubers which grew Bloping in the ground showed a 



difference in roc. kin- quality between the 2 ends, tin- stem end i king more meal} 



than the b.ud end, which in these instances i- generally nearer the surface of the 

 soil. Incidentally the station observed thai in li'<>4 a fine Bandy loam produced 

 potatoes of good quality, while under identical conditions a poorly drained clay loam 

 yielded potato,- which remained firm and SOggy alter boiling and wen- very poor in 

 flavor. 



Irrigation experiments of 1905, ( '. F. Eckart | Hawaiian Sugar Plant 

 J>lr. Agr. and < 'h> m. Ilul. /.;, />/>. /?, dgm. J). — These experiments were begun in 

 1901 (E. S. R., 15, p. 960). 



The harvest of L905 formed a ratoon crop from the planting of L901. The data for 

 the ratoon crop of L903 an' also given. The Lahaina variety produced the largest 

 weight <>f cane for both crops with :; in. of water per week, the average yield being 

 greater l>y 43,415 lbs. per acre than on the plat receiving only 1 in. per week. The 

 plant- given weekly applications of water produced the following yield- of cane pet- 

 acre: One in. per week. 134,491 lbs.; 2in.per week. L60,3951bs.; and :; in. per week, 

 177.iHic, ll.s. As compared with the use of 1 in. per week, the average figures for 2 

 in. of water applied every 2 weeks and .'! in. applied every 3 weeks show a lose in 

 yield per acre of 2.7:;!) and 14,<).">0 lbs., respectively. 



The plant crop of Rose Bamboo was greatest where :•> in. of water per week was 

 used, and the ratoon crop where 2 in. were applied. Comparing the average yields 

 for the 2 crop.-, the 2-in. per week plat gave 32,873 lbs. and the 3-in. per week plat 

 16,604 lbs. of cane more pel- acre than where only 1 in. per week was applied. The 

 general average for the 2 varieties and the 2 crops shows but a small difference in 

 yields «»f cane between the plats receiving 2 and •"! in. per week. 



The method of irrigation and the different amount- of water applied were appar- 

 ently without effect on the quality of the juices. The largest yields of sugar, as a 

 rule, were secured from the heaviest yields of cane, but in 2 instance-, owing to a 

 lower percentage of sucrose in the juice, plats ranking first in yield of cane did not 

 produce the largest yields of sugar. Lahaina produced the greatesl amount of sugar 

 with :; in. of irrigation water per week, and Rose Bamboo with 2 in. 



The plant and ratoon crop of Lahaina with 1 in. of water pel' week, or 1,632,219 gal. 



in addition to 1,926,502 gal. of rainfall, gave an average yield of 22,560 lbs. of sugar 



per acre. As compared with this result, 2 in. of water per week gave a '_ r ain of :;,7">^ 

 lbs. of sugar, and ."» in. a gain of 7,862 lbs. per acre, or 1 11>. of sugar for each additional 



44S and 41S gal., respectively. The average results of the plant and ratoon crop- of 



Rose Bamboo show a distinct loss in Bugar production when.", in. instead of 2 in. of 



water per week were n-ed. The plant cane crop of Lahaina showed a gain of only 



2.:;:;:; lbs. of sugar on increasing the irrigation from l in. to 2. in. per week, and an 

 average gain for the 2 crop.- of 7,862 lbs. 



The results in general call attention to the different water requirements of the 2 

 varieties and the necessity of 1 >a-in-_r conclusions upon more than one crop test 



