126 STORRS AGRICULTURAL EXPERIMENT STATION. 



without fertilizer. In the case of the cow peas the N'ields per 

 section are the weights of the green crop when harvested. 

 The grain of the corn and the soy beans were dried in the 

 barn and weighed when thought to be in good condition for 

 grinding into meal. The corn stover was field cured and then 

 weighed, while the soy bean straw was discarded because most 

 of the leaves had dropped off before the seed ripened, leaving 

 onl}^ the bare stalks and the pods. 



The cost of the fertilizers per acre as given in the tables 

 represents the cash market value of the various ingredients 

 when sold in the form of raw materials, the cost of mixing, 

 transportation and agents' profits being left out of considera- 

 tion. The costs are calculated from the weights of the in- 

 gredients per acre, as used, and the value of the ingredients 

 as adopted by the New England Experiment Stations. The 

 valuations of the different ingredients used in the experiments 

 of 1 90 1 were as follows: 



Per Pound. 

 Nitrogen in nitrate of soda, - - - - - 14 cts. 



Nitrogen in sulphate of ammonia, . _ . . i6j^ " 

 Organic nitrogen (in dried blood), - - - - 16^ " 



Phosphoric acid (soluble), - - - - - - 5 " 



Potash in muriate of potash, . . . . . 41^ " 



The second table in each case gives the total yields of crop 

 per acre, the percentages of water-free substance in the crop 

 as weighed to obtain the yields, the percentages of protein 

 (N. X 6.25) in the dry matter, and the estimated yields of dry 

 matter and of protein per acre. The amounts of dry matter 

 per acre are calculated by multiplying the total weights of crop 

 per acre as harvested b}^ the percentage of dry matter, and the 

 amounts of protein per acre are calculated by multiplying the 

 estimated weight of dry matter per acre in the crop from the 

 various sections by the corresponding percentages of protein. 

 The last two columns show the percentages of the yields of dry 

 matter and of protein for each section when the yields from 

 the sections of the mineral plots are taken as a basis (100). 



Chemical analyses. — The only chemical determinations made 

 were those of moisture and total nitrogen. Water-free sub- 

 stance was estimated by difference. The total protein was 

 estimated from the total nitrogen by multiplying by the factor 



