KIKLD ("KOl'S. 



447 



of storiiitr upon the coinpositidii, iiml tlif irlutivi' value of several iienerally u.sed 

 iiiethoils 111 storing. The results with different forms of potash as a fertilizer are pre- 

 sented in the following table:. 



liesults of expernnents with different forms of potash as a fertilizer for street pottitoes. 



Compost ami kaiiiit 



Coniiiost and m\iriateof potash. 



Nothing 



Compost and sulphate of potash 

 Compost and silicate of potash . 

 Compt)st 



„_..„, , • , ' Water-free mate- 



Onginal material. j j 



Water. Starch. 



Per cent. 

 63.81 

 63.77 

 62. 07 

 64.97 

 65.87 

 65.26 



Per cent. 

 22.86 

 22. 21 

 24.58 

 21.63 

 20.70 

 20.80 



Dry sub- 

 stance. 



Per cent. 

 36.19 

 36.23 

 37.93 

 35.03 

 34.13 

 34.74 



Per cent. 

 63.16 

 61.31 

 64.80 

 61.75 

 60.66 

 59.88 



Yield of 

 sweet 

 potato 



per acre. 



Pounds. 

 11,403 

 9, 006 

 7, 986 

 9, 576 

 9,744 

 8,103 



Yield of 



starch 



per acre. 



Pounds. 

 2,607 

 2,000 

 1,963 

 2,071 

 2,017 

 1,685 



Compost was used at the rate of 1,000 lbs. per acre while kainit, nuiriate, sulphate, 

 and silit-ate of potash were applied at the rate of 400, 100, 100, and 2o0 lbs. per aere, 

 respectively. The variety used in this test was Horton yam. 



The study of the effects of storing on the composition of the sweet potato was con- 

 ducted with the same variety. The sweet potatoes fertilized with the different forms 

 of potash mentioned abeve were stored November 28 and analyzed at that time and 

 at different periods later. 



The ligures for all plats for the different periods are given in the following ta))le: 



AiKili/xr.f lit ilijf'erciit perin<ls of xloriiig if sireet potiitors fertilizeil trilli iJiffrrnit foniis of 



potasJt. 



n Tubers spoiled. 



After a storage of 140 days, the roots fertilized with kainit had lost 30.7 per cent 

 of the starch originally present; those fertilized with muriate of potash, 34.4 per 

 cent; the roots which had received no fertilizer, 32.1 per cent; and those fertilized 

 with sulphate of potash, 14.8 per cent. The sweet potatoes from the other plats 

 <lecayed. 



" It wouM api)ear from these particular experiments that the loss of starch, which 

 the sweet potat(j sustains on storing, is to ])e attributed very largely, l)ut not wholly, 

 to the increased formation of sucrose or cane sugar in the same. There may be i)os- 

 sil)ly formed s;)me other intermediate products, such as dextrin, but this has not yet 

 been established." 



In connection with this work the effect of storing upon the composition of different 

 varieties of sweet potatoes was studied. The highest content of starch, 19.58 per 

 cent, was found in the Bunch yam and the next highest in the Georgia yam. It was 

 noticecl that a high percentage of starch was usually accompanied by a low percent- 



