24 EXrERBIEXT STATION. [Jan. 



On the basis of increase as compared with the no-nitrogen 

 plots the relative standing for the different fertilizers for the 

 twenty-three years is as follows : — 



Per Cent. 



Niuale of soda, 100.00 



Barnyard manure, ......... 78.78 



Dried blood, 73.85 



Sulfate of amniouia, 53.19 



Nitrate of soda, as in previons years, shows the greatest 

 average increase. The striking results obtained last year on 

 the no-nitrogen plots are not so apparent this year. In 1911 

 the yield on the no-nitrogen plots was 95 per cent, of the aver- 

 age yield on all the different nitrogen plots; this year the no- 

 nitrogen plots are represented by 73 per cent. In commenting 

 npon the good showing made by the no-nitrogen plots last year, 

 Dr. Brooks said : — 



One of tlie most striking results of the past season Avas the I'elatively 

 large yield produced on the no-nitrogen plots. It amounts to about 95 

 per cent, of the average yield on all the different plots which have re- 

 ceived an application of nitrogen annually. This result, it will be 

 readily understood, was no doubt due to the fact that clover for three 

 years had preceded the corn crop of the past year. The figures empha- 

 size in a most striking way the extent to which rotations including a 

 legume may be made to take the place of the use of nitrogen fertilizers. 



Muriate r. Sulfate of Potash. 

 Field B. 

 This is the twenty-first year of the experiment. The field 

 consists of five pairs of plots, numbered from eleven to twenty. 

 The odd plots (eleven, thirteen, etc.) have received annually 

 an application of muriate of potash, while the even plots 

 (twelve, fourteen, etc.) have received an application of high- 

 grade sulfate of potash. In nddition to the potash the plots 

 have received annunlly an applicaticm of bone meal at the rate 

 of 000 pounds per acre. During the early period of the experi- 

 ment the potash salts were used in different amounts in differ- 

 ent years. For the last twelve years an annual application of 



