324 Bulletin 179. 



acre. When nitrate of soda was used with muriate of potash the 

 yield was reduced to 240 lbs. per plat. This means that potash plus 

 nitrogen gave 27 bushels less tlian potash alone. Here again the 

 nitrogen compound was injurious. 



Something more of interest and importance may be learned from 

 this series of experiments. For example, it was observed that while 

 the stable manure gave the largest yield, the crop contained the 

 most small potatoes, and the tubers were more scabby than on the 

 other plats. Also where nitrate was used the potatoes were of a 

 poorer quality and more scabby. On the other hand, plats treated 

 with either potash or superphosphate produced very line, smooth 

 tubers ; the plat with a mixture of potash and superphosphate pro- 

 duced as line a lot of tubers as the Station representative has ever 

 seen. 



It is clearly proved by this set of experiments that it would be a 

 waste of money to buy nitrogenous fertilizers for potatoes on this 

 field ; but in all probability it might be a good investment to use a 

 moderate amount of potash and superphosphate. It must, however, 

 not be forgotten that these results, while applicable to this particular 

 field, may or may not be suited to a neighboring farm or even to 

 another part of tliis same farm ; for on other farms, even if near by, 

 some at least of the conditions of the soil which may affect the crop 

 may and are likely to be different from those of the soil tested by 

 these experiments. The soil of another farm may be quite different 

 and it may have received quite different treatment in previous 

 years. 



Potato experiments by Mr. H. H. Bonnell, Waterloo, N. Y. 

 — Mr. Bonnell has experimented during the past three years. We 

 give here a condensed form of his experiment for 1899. Each plat 

 was ^jj of an acre and contained four rows of potatoes. The two 

 central rows were harvested and weighed, giving the yield per -^^ of 

 an acre for each plat. The figures in the table represent the yield 

 in bushels per acre, calculated from pounds per ^^^ of an acre. 



