148 
in section A. Section B is the same as the corresponding- 
plats in A, but with the addition of 750 lbs. of lime per acre. 
Two ingredients were combined in section C. For instance: 
the different forms of phosphoric acid were applied together 
with potash. In section D complete fertilizers were added. 
It will be seen by referring to the diagram that the fertilizing- 
ingredients were applied so as to supply the same amount of 
phosphoric anhydrid, nitrogen and potash, viz.,. 75 lbs. per 
acre, and that only the forms have been changed. For ex- 
ample: plat 2, section 1, has been treated with 5 lbs. of super- 
phosphate, or at the rate of 75 lbs. phosphoric acid per acre, 
and plat 7, section A, received 6.7 lbs. of hoofmeal, which is 
also at the rate of 75 lbs. nitrogen per acre. It will also be 
noticed that in any plat the sections B, C and D were formed 
from section A by the addition of one or more fertilizer in- 
gredients, always at the rate of 75 lbs. per acre, so that sec- 
tion A has 75 lbs. plant food per acre, section B the same to- 
gether with lime, section C 150 lbs., and section D 225 lbs. 
plant food. 
It Avas the writer's opinion that by this method of experi- 
menting very conclusive results could be obtained by a refer- 
ence to and comparison of the field notes taken during the 
progress of growth of the plant and the yield as finally w^eigh- 
ed. For instance : by referring to the record of plat 7 in toto ; 
plat 3, section D; plat 10, section D; and plat 11, section C, 
one may obtain a very definite idea of the effect of sulphate 
of ammonia upon pineapples wdien used alone and when in 
combination with other material. 
The fertilizer was applied in the furrow about two days be- 
fore planting and thoroughly mixed with the soil before the 
plants, young suckers, were set. While the writer did not be- 
lieve this to be as desirable a method of application as broad- 
casting, he accepted it as one very much in use and which 
under existing circumstances was the more convenient. The 
suckers were all fumigated with hydrocyanic acid gas before 
planting to kill any scale or mealy bug which might have been 
present. Only healthy plants were taken and as nearly of a 
size as it was possible to get them. All the plants in the ex- 
periment were set on June 15, 1908. 
The fertilizers used were carefully analyzed in the labora- 
tory and the proper amount for each section was weighed 
into a bag marked and tagged before shipping to the pineapple 
plantation. It should be mentioned that the reverted phos- 
phate used in plat 4 is a material containing 22% total phos- 
phoric acid, about half of which is in the form of di-calcium 
phosphate, possibly 1% as mono-calcium phosphate, and the 
iDalance tri-calcium phosphate. The reason for including this 
