The Barbados Sugar Cane Experiments. 359 



It is evident that in the soils at Dodds, deficient 

 in potash, largely increased yields of canes were 

 attained by the addition of potash salts to the manures 

 used, and from the continued increase by the increased 

 amounts of potash, it appeared that this substance exerted 

 a marked influence upon the yield of the sugar cane, and 

 possibly a slight one upon the sugar contents of the juice • 

 and as these results were consistent all through 

 the experiments, their value is far greater than if 

 deduced merely from an average of experiments not in 

 stri6l accordance. 



The produce obtained without potash in the manure, 

 on an average, had •161 per cent, or 148*8 lbs of potash, 

 whilst that grown with potash in the manure, averaging 

 in amount 60 lbs. per acre, contained .188 per cent, or 

 1 91*3 of potash. Thus of the 60 lbs. applied, 

 427 lbs., equal to 71*2 per cent, of the potash applied. 

 was recovered in the produce. The relatively high 

 proportions of the phosphates and potash applied in the 

 manures which have been recovered in the produce were 

 probably due to the great deficiency of these constituents 

 in the soil, whilst the low proportion of nitrogen recovered 

 where it had been applied in quantities of 40 lbs. per 



