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The check plats gave higher results in the direction from 
plats 1 to 12, which indicated possible increase of natural 
fertility in that direction, plat 1 having an average pine of 
3.78 lbs. and plat 9 an average pine weighing 4.53 lbs. It 
would hardly be fair to the first six plats to figure the whole 
experiment against the average of all the check plats, as they 
would have an undeserved disadvantage, while the other six 
plats would be receiving credit they were not entitled to. 
Also, if the phosphoric acid plats were figured against the 
first check plat, the nitrogen against the fifth plat, the super- 
phosphate and nitrate of soda plats would have an advantage 
not shared by the bonemeal and ammonia sulphate. These 
in turn would have a certain advantage over the reverted 
phosphate and organic material. 
In the case of the potash plats, it was thought at first that a 
theoretical check plat 13 could be used, against which part 
of the potash plats might be figured, but upon more careful 
deliberation it was decided that the better policy would be to 
confine all results and conclusions to the actual data in hand 
rather than indulge in theoretical speculation, however con- 
servative it might be. Therefore, in the tabulated results, the 
gain and loss in the potash plats was figured from check plat 
No. 9. The other plats were figured against the adjacent 
check plats with the exception of plats 3 and 7, which have 
no adjacent check plat. The gain or loss in these tAvo plats 
was figured against the average of the two nearest check 
plats. 
In computing the commercial value of the fertilizer used, 
the schedule of trade values issued by the California Agricul- 
tural Experiment Station^ was taken as a basis from which 
to figure all mixtures. The values given represent in a general 
way the market in Honolulu, and as all the ingredients used 
were figured from the same base the results are therefore 
comparable. The value of agricultural lime was taken as 
$10.00 a ton. 
The canneries accept pineapples weighing more than three 
pounds at a general rate of $20.00 per ton. The pines which 
do not reach this minimum are either left on the field or dis- 
posed of for juice at half price. As all the sections averaged 
over three pounds, $20.00 a ton was taken as a value of the 
pines. The fact that the pineapples averaged three pounds 
does not necessarily mean that they were all over the three- 
pound limit, although in the fertilized plats they invariably were. 
Nevertheless, in the first check plat 11.25 per cent, of the pines 
gathered weighed less than three pounds. Here is a point 
which should be considered as a potential advantage of the 
1 Bulletin 207, College of Agriculture, Berkeley, California. 
