32 
MANURING EXPERIMENTS WITH PADDY RICE. 
Phosphoric acid 
per tan.. 
Un¬ 
man¬ 
ured 
With¬ 
out 
Phosph. 
Acid. 
5 
kilo¬ 
grms. 
10 
kilo¬ 
grms. 
15 
kilo¬ 
grms. 
20 
kilo¬ 
grms, 
25 
kilo- 
g rms. 
30 
kilo¬ 
grms. 
Phosphoric 
Acid , grammes 
per plot : 
In the grain .. 
0.45 
0 39 
I.08 
2.04 
2.45 
2.80 
2.86 
3-30 
„ ,, straw .. 
O.17 
0.16 
O.38 
0.65 
o-94 
1.21 
1.24 
1.41 
„ „ chaff .. .. 
0.02 
0.02 
0.05 
0.07 
0.09 
O.II 
0.10 
O.II 
Total .. 
0.64 
0.57 
I- 5 1 
2.76 
3-48 
4.I2 
4.20 
4.82 
In the crop produced 
without phosphoric 
acid . 
0.57 
o-57 
0.57 
0 57 
0.57 
0.57 
Assimilated from the 
manure. 
_ 
o-94 
2.19 
2.91 
3-55 
3-63 
4.25 
Applied in the ma¬ 
nure . 
_ 
4-59 
g.18 
13-77 
18.36 
22.95 
27.54 
Assimilated, per cent 
of the phosphoric 
acid applied.. 
20.5 
22.8 
21.1 
19.4 
15.9 
15.4 
Rice plants are accordingly capable of taking up of the soluble 
phosphoric acid applied in doses of 5—25 kilogrms per tan, 
20—25%, which rate does not differ from the results obtained 
in practice with other crops. From exceedingly large dressings, 
however, noticeably less is consumed, viz. from 20—30 kilo¬ 
grms. only 15—16%. Thus, considerable quantities of this 
valuable nutrient are left in the soil even after the application of 
moderate doses, and will doubtless act beneficially in the next 
season. 
The proportions of potash found in the mature crop were, as 
follows, per cent of the dry matter:— 
