104 HATCH EXPERIMENT STATION. [Jan. 



sources of nitrogen. The crop of this year, potatoes, gives 

 ^delcls on the basis of wliich the materials rank in the fol- 

 lowing order : dried blood, sulfate of ammonia, barnyard 

 manure, nitrate of soda. The yield on the last two is, how- 

 ever, below the yield on the plots receiving no nitrogen, and 

 the results are complicated by the fact that the crop suffered 

 from blio;ht and rot. The averaofe to date ranks the materials 

 in the following order: nitrate of soda, barnyard manure, 

 sulfate of ammonia, and dried blood. 



II. — To determine to what extent, if any, the introduction 

 of a crop of the clover family will make the application of 

 nitrogen to the following crop unnecessary. Potatoes this 

 year followed soy beans, and gave a yield on the no-nitrogen 

 plots equivalent to 99.3 per cent, of that obtained on the 

 plots to which nitrogen has been yearly applied. 



HI. — To determine the relative value of muriate and high- 

 grade sulfate of potash for field crops. The results of the 

 3'^ear indicate sulfate to be superior to the muriate for cab- 

 bages, mixed timothy and cloyer, and potatoes as indicated 

 by the yield of merchantable tubers. The results with 

 onions were indecisive as the crop failed to mature, largely, 

 it is believed, on account of the cold summer. 



IV. — A. To determine the relative value of nitrate of 

 soda, sulfate of ammonia, and dried blood, used in connec- 

 tion with manure as sources of nitrogen for garden crops. 

 The results indicate these materials used in amounts fur- 

 nishing equal nitrogen to rank in the following order : 

 nitrate of soda, dried blood, sulfate of ammonia. £. To 

 determine the relative value of sulfate and muriate of 

 potash for garden crops. The results of the year indicate 

 the sulfate of potash to be the better for onions, tomatoes 

 and celery ; while the muriate has given slightly superior 

 results with strawberries and squashes. 



V. — To determine the relative value of difierent potash 

 salts for field crops. The salts under comparison are high- 

 grade sulfate, low-grade sulfate, kainite, muriate, nitrate, 

 carbonate, and silicate. The crop of this year was clover. 

 The potash salts giving the best yields are th(? silicate, high- 

 grade sulfate, and nitrate. The most striking result brought 



