Upon this average the profit or loss from the use of nitrogen is cal- 

 culated, no allowance being made for unexhausted residue. 



Similar comparisons and calculations are made for phosphoric acid 

 and potash. The results for all these ingredients are shown in tabu- 

 lar form under each experiment. 



P'or convenience of comparison with each other and with the results 

 just mentioned the net results of the use of "complete fertilizer," 

 barn-yard manure, plaster and lime are shown in another table, 

 although this plan involves the repetition of some of the figures given 

 in the general tabular view of the entire experiment. Below this 

 table will be found a calculation as to financial result of the use of 

 each. In this calculation no allowance is made for unexhausted res- 

 idue of either manure or fertilizer. This omission undoubtedh' makes 

 the showing for manure more unfavorable than it should be. If we 

 make the usual allowance of one-half, the manure will come much 

 nearer paying for itself and for labor of application which, it should 

 be remembered, has not been charged. The expression "complete 

 fertilizer " is used in the ordinary sense, to designate a mixture which 

 supplies nitrogen, phosphoric acid and potash. 



MARBLEHEAD. 



SOIL TESTS WITH FERTILIZERS FOR CORN. 



By William S. Phillips, Jr. 



*Cords. 



