FLORIDA ,STATE HORTICULTURAL SOCIETY. 
109 
water, of the potash and phosphoric acid or potash. In this particular soil there is 
in the seven samples from Tank i. The about twice as much phosphoric acid as 
large amount of the nitrogenous materi- nitrogen. Neither would we be justified 
Potash and Phosphoric Acid in Drainage Water; Parts per Million Parts 
of Water. 
POTASH. 
1.3 
• 
.13 
■ 
.21 
■ 
.27 
mi 
,23 
■1 
.17 
■ 
.29 
■ 
18 
■ 
als- 
— 3 ° 
cases—: 
. Aug. 6- 
. Aug. 15 
. Aug. 24 
. Sept. $ 
. Oct. 10 
. Oct. 19 
PHOSPHORIC ACID. 
. Aug. 1 
. Aug. 6 
. Aug. 15 
. Aug. 24 
. Sept. 8 
. Oct. 10 
. Oct. 19 
iiiuiwu ~ r - *■ 
them on the same scale. 
Especial attention should be called to 
the small amount of phosphoric acid that 
is lost. The slow way in which the nat¬ 
ural phosphates dissolve in the ground 
waters, no doubt, accounts in part for 
this. It is certainly not due to the absence 
of phosphates, for in many places in the 
State the soil is better supplied with phos¬ 
phoric acid than it is with either nitrogen 
in saying that because we do not find 
phosphoric acid in the drainage water it 
is not available for plant growth. The 
magnificent and abundant growth of 
hardwoods and 1 other vegetation in some 
of our hammocks must convince us that 
such a view is not well founded, for the 
ash of some of these is high in phosphoric 
acid. In this connection it may be pointed 
out that the orange tree and fruit requiie 
less phosphoric acid than they do of either 
