30 EXPERIMENT STATION. [Jan. 



monia and dried blood. This experiment was begun in 1890. 

 The crop of this year was clover, sown in the standing corn in 

 August of last year. On the basis of total yield (grass as well 

 as clover included), the materials under comparison rank in the 

 following order : nitrate of soda, dried blood, barnyard ma- 

 nure, sulfate of ammonia. The no-nitrogen plots gave a larger 

 total crop than the sulfate of ammonia, and the clover in these 

 plots was better than on any of the others. On the basis of in- 

 crease in crop as compared with the product of the no-nitrogen 

 plots, taking into account all the crops grown since the experi- 

 ment began, the materials on a percentage basis rank as follows : 

 nitrate of soda, 100; barnj^ard manure, 85.92; di'ied blood, 

 70.21; sulfate of ammonia, 45.36. 



II. — Experiment to determine the relative value of muriate 

 and high grade sulfate of potash. The crops on the basis of 

 which comparison this year is possible were caljbages, rhubarb, 

 raspberries, blackberries, asparagus, corn and squashes. The 

 sulfate of potash gives the larger crops of raspberries and black- 

 berries. For the other crops the muriate gives the larger crops ; 

 but the difference is unimportant except in the case of the as- 

 paragus, which is much better on the muriate than on the sulfate. 



III. — Experiment to determine the relative value of differ- 

 ent potash salts for field crops. The salts under comparison 

 were kainit, high-grade sulfate, low-grade sulfate, nuu^iate, 

 nitrate, carbonate and silicate. The crop was potatoes. The 

 salts, on the average of five trials for each, rank in the follow- 

 ing order, as measured by the product of merchantable tubers : 

 low-grade sulfate, muriate, nitrate, high-grade sulfate, silicate, 

 carbonate, kainit. There was considerable scab, — a much 

 greater amount on the carbonate than on the other potash salts. 



IV. — Experiment to show the relative value for corn of 

 special corn fertilizers, as compared Avith a mixture richer in 

 potash. The special corn fertilizer gave a larger yield of sound 

 corn. The fertilizer richer in potash excelled in the product 

 of soft corn and stover. With an earlier spring and a hotter 

 season, the proportion of sound corn produced on the ferti- 

 lizer richer in potash would undoubtedly have been increased. 



V. — Experiment to determine the relative value for pro- 

 duction of corn of manure alone, as compared with a smaller 

 application of manure and a moderate amount of sulfate of 



