The Bulletin. 



29 



The figures in tables 3 and 6 for field "A'' show a profit from the 

 use of fertilizer in every case but one. This one loss is on plat 2, the 

 only plat except the lime plat, number 18, which did not receive 

 phosphoric acid as a fertilizer. A careful comparison of the items 

 in the profit colunm indicates that practically all the profit is from 

 phosphoric acid. 



In table 6 we find that the twice normal application of nitrogen- 

 on plat Y gave less profit than one-half normal, plat 6 ; that the 

 twice normal application of potash, plat 12, gave only 9 cents more 

 profit than the one-half normal application on plat 11 ; but that the 

 twice normal application of phosphoric acid on plat 10 gave nearly 

 twice the profit that the one-half normal, plat 8, did. Too, when 

 the application of phosphoric acid was cut down to one-half normal, 

 plat 8, the profit was reduced far below that given by plats 6 and 

 11 in which nitrogen and potash' respectively were applied in half 

 normal amounts. Furthermore, the profit on plat 16, which re- 

 ceived twice normal was less than on plat 10, receiving normal 

 amounts of nitrogen and potash, and twice normal amounts of phos- 

 phoric acid. 



