92 HATCH EXPERIMENT STATION. [Jan. 



To determine the relative value of nitrate of soda, sulfate 

 of ammonia and dried blood as sources of nitrogen, and of 

 muriate of potash and sulfate of potash as sources of potash 

 for garden crops, — seven plots. 



To determine the relative value of kainite, and of the 

 muriate, high-grade sulfate, low-grade sulfate, carbonate, 

 silicate and nitrate as sources of potash, — forty plots. 



To determine the relative efficiency of equal money's worth 

 of dissolved bone-black, ground South Carolina rock, ground 

 Florida phosphate, Mona guano and phosphatic slag as 

 sources of phosphoric acid, — six plots. 



To determine the relative efficiency of equal quantities of 

 phosphoric acid, furnished in the following materials : acid 

 phosphate, dissolved bone-black, dissolved bone, fine-ground 

 raw bone, fine-ground steamed bone, fine-ground South Car- 

 olina phosphate, fine-ground Florida phosphate, phosphatic 

 slag, apatite, Navassa phosphate, — thirteen plots. 



To determine the relative value of manure alone, as com- 

 pared with a smaller quantity of manure and a moderate 

 amount of potash, for the corn crop, — four plots. 



To determine the relative value of mixtures of fertilizer 

 materials, furnishing, on the one hand, nitrogen, phosphoric 

 acid and potash in the same proportions as in average corn 

 fertilizers, and a mixture of similar materials containing more 

 potash, — four plots. 



Soil test with mixed grass and clover, — fourteen plots. 



Soil test and experiment to determine the effect of liming 

 for onions, — twenty-four plots. 



Experiment in manuring grass lands, — three plots. 



Experiment to determine the value of nitrate of soda for 

 the rowen crop, — twelve plots. 



Experiment in the use of fertilizers for orchard trees, — 

 five plots. 



Experiment to determine the relative efficiency of manure 

 hauled and spread as fast as made, compared with manure 

 put into large piles and spread in the spring, — ten plots. 



Alfalfa, on which the effect of liming the soil is being 

 studied, occupies four plots. 



One of the plot experiments upon hired land has for its 

 object the determination of the value of nitragin, or germ 



