8 MANURING EXPERIMENTS WITH PADDY RICE (SECOND YEAR). 
Phosphoric 
Phosphoric acid Phosphoric acid taken 
in the dry acid in up from the 
matter of the the manure, soil, resp. 
whole crop. grms. from soil 
^-^ 
N 
& manure. 
°/o 
grms. 
grms. 
Unmanured, 1889... 
...0.240 
0.64 
0 
o-55 
,, 1890... 
...0.165 
0.86 
0 
0> 53 
Without phos- 
phoric acid, 1889... 
...0.232 
0.61 
0 
0.52 
t— « 
00 
kO 
0 
...0.165 
0.88 
0 
°-55 
Complete ma- 
nure, 1889 5 
...0.320 
4.12 
18.36 
T°3 
,, 1890... 
...0.206 
2 -73 
18.36 
2.40 
It may thus be seen 
that the 
quantity 
of phosph 
oric acid 
taken up from the unmanured plots 
and from those which had 
not received phosphatic 
nutrients 
showed 
only slight fluctua- 
tions in the two seasons. 
There is in this 
fact clear 
evidence 
that the exhaustion induced hy 
the first 
crop was 
almost 
exactly compensated by the fluxation of phosphatic material 
formerly inaccessible to the plants. A calculation made in the 
same way as in the case of nitrogen shows that by decom¬ 
position of soil ingredients 0.7 kilogrms. had been added per 
tan to the stock of available phosphoric acid left unexhausted 
by the preceding crop. 
There is, on the other side, a considerable difference between 
the seasons in regard to the consumption of the liberal dose 
of phosphoric acid given in the complete manure, as is 
demonstrated in the following calculation : 
Phosphoric acid, grms. 
00 
00 
00 
CD 
O 
In the whole crop. 
.4.12 
2-73 
In the crop grown 
without 
phosphoric acid. 
.o -57 
0.88 
Taken up from the manure 
. 3-55 
1.85 
Applied in the manure ... 
. 18.36 
18.36 
5 Average of plots 30, 40, and 45 of 188g. 
