1901.] PUBLIC DOCUMENT — No. 33. 103 



Florida phosphate plot, 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 Avas 

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

 the Florida phosphate and the dissolved bone-black giving 

 the smallest yields, although the latter was not very much 

 behind the balance of the })lots. 



Since the third year of the experiment the yields on the 

 plots to which phosphatic slag, Mona 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 cabbages, have 

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

 the rate of about 40 bushels per acre ; but even the uo-phos- 

 phate plot gave practically the same yield as any of the 

 others, so that the results with that crop really alibrd no light 

 upon the particular question touched by this experiment. 

 Taking into account all the crops which have l)een grown 

 upon this field, except the Swedish turnips, which were 

 affected 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 different phosphates is as 

 follows : — 



Per Cent. 



Phosphatic slag, 100.0 



Groimd South Carolina rock, 92.3 



Dissolved l)one-lilack, - 90.7 



Mona guano, 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 plots since 

 1895, and excei)ting the Swedish turnips, which Averc groAvn 

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

 following relative rank : — 



