MANURING EXPERIMENTS WITH PADDY RICE (SECOND YEAR). 
27 
but as to the assimilability some of them gave results very 
similar to those obtained with the lesser quantities of manures. 
Thus we found the following relations of the assimilability, that 
of the phosphoric acid of superphosphate being reckoned as 100 : 
Super- Precipitated Thomas Peruvian 
phosphate., phosphate. phosphate. guano. 
Small dose. 100 104 56.9 34.4 
Large dose. 100 102 57.1 35.6 
With reference to the other manures, except phosphorite 
and sodium phosphate, the proportions taken up from 100 
parts of the phosphoric acid applied, were nearly the same 
with the small as with the large doses. The results were thus : 
Steamed 
Crude 
Bone 
bone dust. 
bone dust. 
ash. 
Small dose 
... 14.15 % 
14.6 % 
6 . 6 % 
Large dose 
... 15.32 „ 
*54 » 
74 ” 
A somewhat peculiar deportment is displayed by the sodium 
phosphate, with which we obtained the following figures, the 
effect of the phosphoric acid of the superphosphate being 
reckoned as 100 : 
Relative Relative 
increase of consumption 
hulled grain. by the crop. 
Small dose.50.2 45.3 
Large dose.86.2 78.8 
What surprises us here first, is the low rate of consumption 
and the small increase of the crop in comparison with the 
superphosphate. We are inclined to expect the sodium phos¬ 
phate, on account of its greater solubility, to undergo a still 
better distribution in the soil and thus to be more accessible 
to the roots and more effective on the crop than even the 
superphosphate, but the experiment contradicts that anticipa¬ 
tion. In the second place it strikes us that, contrary to the 
deportment of the other manures, the small dose of sodium 
phosphate was consumed to a relatively less extent, and pro¬ 
duced a relatively less increase of the crop than the large dose. 
The only explanation that can be given for these results, is 
