IMPROVEMENT OF THE SUGAR CANE. 127 
sulphate of ammonia or of nitrate of soda, we‘found that 
this amount yielded approximately 6 tons of canes per 
acre on land which had not been limed. On limed land 
we obtained in round numbers 53 tons of canes by the 
use of 4o lbs. of nitrogen. In the experiments where 
mixed minerals were used on not limed land with nitro- 
gen, 60 lbs. of the latter in the form of sulphate of am- 
monia, about 50 per cent greater increases of canes 
were obtained than with 40 lbs., while the highest rate of 
manuring with 80 Ibs. showed a decided falling off in the 
rate of increase. Where the land had been limedtheincrease 
obtained by manures supplying over 4o lbs. of nitrogen 
per acre rapidly declined, and this was probably due in 
part to the large amount of soil nitrogen rendered avail- 
able by the heavy liming. 
‘These experiments fully corroborated those of the Colo- 
nial Company with regard to the relative agricultural 
values of nitrate of soda and sulphate of ammonia, these 
proving pra€tically the same when used in quantities 
capable of supplying not more than 4o0 lbs. of nitrogen 
peracre. The physical disadvantage of liability to deli- 
quescence in this humid climate, and the extra costs of 
carriage and of application of nitrate of soda, lead to the 
conclusion that, as a rule, the more satisfactory results, 
from a pecuniary point of view, should be obtained by the 
use of sulphate of ammonia. 
The experiments indicated 2} to 24 cwts. of sulphate 
of ammonia per acre as the most certainly profitable 
rate of application on soils of similar charaé€ter to those 
of the Botanic Gardens, Possibly the most satisfactory 
results would be obtained by the use of a mixture of 100 
lbs, of nitrate of soda and 200 lbs, of sulphate of ammonia 
