38 EXPERLMENT STATION. [Jan. 



the potatoes on the muriate of potash plots was lighter in color, 

 it may be described as a pea green, while that on the sulfate 

 of jDotash plot was of a much darker shade. An attempt has 

 been made to demonstrate whether there is a difference in the 

 amount of chlorophyl developed in the foliage produced, respec- 

 tively, by the different potash salts, but the efforts so far made 

 have not demonstrated such a difference. It is perfectly clear, 

 however, that the muriate of potash as compared with sulfate 

 is distinctly unfavorable to the production of starch in the 

 tubers, the percentage of this constituent being almost inva- 

 riably considerably higher than in the potatoes produced on 

 the muriate. 



The yield of oat hay on the muriate is consiaerably heavier 

 than on the sulfate, and this result seems to be somewhat in 

 harmony with results which we have previously obtained with 

 corn, in the ease of which grain the yield of stover on the 

 muriate appears to be usually heavier than on the sulfate under 

 otherwise similar conditions. 



III. ^iteogejst Eeetilizeks at^d Potash Salts for Gaeden 



Crops. 

 Three different nitrogen fertilizers, sulfate of ammonia, ni- 

 trate of soda and dried blood, and two potash salts, muriate and 

 high-grade sulfate, each salt being used with each of the nitro- 

 gen fertilizers, are under comparison on Field C. In connec- 

 tion with the fertilizers named dissolved bone black was used 

 in liberal amounts, which are the same on all plots. The com- 

 parison of these different fertilizers in this field was begun in 

 1891, but up to 1898 they were used alone. Since that time all 

 plots have received annually a dressing of stable manure, at the 

 rate of 30 tons per acre. The nitrogen fertilizers are used in 

 such quantities as to furnish nitrogen at the rate of 60 pounds 

 per acre, the potash salts in such quantities as to furnish 120 

 pounds of actual potash per acre, and the dissolved bone black 

 was applied at the rate of 320 ])ounds per acre. The crops of 

 the ])ast year won-e asparagus, strawberries and onions. 



