51 POTATOES. 



1895. 



By William P. Brooks, Agriculturist. Thirty-third Annual Re- 

 port. 



"i. Eight experiments, comparing the sulphate with the muriate 

 of potash, have given an average 22.1 bushels of merchantable 

 tubers per acre more where the sulphate was the source of potash. 



**2. The eating quality of the tubers raised when the sulphate has 

 been the source of potash has generally been better than when the 

 muriate was used. 



"3. Analyses have generally shown that the tubers raised on the 

 sulphate have contained less water and more starch than those raised 

 on the muriate." 



"i. Both being used in connection with material furnishing equal 

 amounts of ni;rogen and phosphates, sulphate of potash gives larger 

 yields of potatoes than muriate of potash. 



* 2. Used in the same way, sulphate of potash produces potatoes 

 of better quality than muriate of potash. 



"3. Potato fertilizers should therefore contain potash in the 

 form of sulphate rather than muriate." 



MICHIGAN, 1892. 

 By L, R. Taft. Bulletin No. 85. 



''The nitrogen perhaps had the least efifect, but the potash and 

 ground bone, whether alone or together, seemed to increase the yield." 

 . . . "Even on fairly rich soil manure for fertilizers for potatoes 

 can be used with profit." 



NEW HAMPSHIRE, 1890. 



By S. E. Whittemore, Colebrook. Bulletin No. 12. The location is 

 in the heart of the potato region of New Hampshire. 



"Every test, adds to the probability of the correctness of my 

 position relative to the need of vastly more potash than our fertilizer 

 manufacturers give us. . . . 



"The conclusion is fully warranted that more potash is needed 

 than the prepared fertilizers furnish." 



Conclusion: "The above results so fully confirm previous ob- 

 servations that I shall simply reprint the conclusions given in Bul- 

 letin No. 10 of this station, page 12. 



"i. Chemicals when properly mixed can fully take the place of 

 farm-yard manure as a source of plant-food. 



