1901.] PUBLIC DOCUMENT — No. 83. 103 



Florida phosphate ph)t, and there was no great difference 

 between these yields. In 1897 the crop was Swedish tur- 

 nips, and the relative growth on the different plots was 

 about the same as this year in cabbages, the no-phosphate, 

 the Florida phosphate and the dissolved l)one-black giving 

 the sinallesl yields, although the latter was not very much 

 behind the balance of the plots. 



Since the third year of the experiment the yields on the 

 plots to which phosphatic slag, INIona guano and South Car- 

 olina rock phosphate have been applied have been substan- 

 tially the same as on the dissolved bone-black plot, with the 

 exception of the turnips and the cabbages, where the yields 

 of these plots have been considerably greater than on the 

 dissolved bone-black. All the crops grown upon the field, 

 with the exception of the turnips and the cal)l)ages, have 

 given fairly good yields. The oat crop of last year was at 

 the rate of about 40 bushels per acre ; but even the no-phos- 

 phate plot gave practically the same yield as any of the 

 others, so that the results wath that crop really aflbrd no light 

 upon the particular question touched Ijy this experiment. 

 Taking into account all the crops which have been grown 

 upon this field, except the Swedish turnips, which w^ere 

 afiected by disease not apparently due to the fertilizer which 

 had been used on a portion of the plots, and the yields of 

 which, therefore, as expressed in figures, would be mislead- 

 ing, and representing the aggregate yield which stands high- 

 est by 100, the efficiency of the difiereut phosphates is as 

 follows : — 



Per Cent. 



Phospliatic slag, 100.0 



Ground South Carolina rock, 92.3 



Dissolved l)one-l)lack, 90.7 



Mona g'uano, 88.3 



Florida phosphate, 71.5 



There was at first no no-phosphate plot used in this experi- 

 ment, but we have had a no-phosphate plot since 1895. 

 Taking into account the yields of the several jdots since 

 1895, and exce})ting the Swedish furuips, which were grown 

 in 1897, for reasons above slated, the phosphates have the 

 following relative rank : — 



