34 
MANURING EXPERIMENTS WITH PADDY RICE. 
Grain. 
Straw. 
Whole crop 
Minimum 
0.304 
0.469 
0.429 
Maximum 
o- 33 ° 
1.620 
1-053 
In the crops dressed with much nitrogen and phosphoric acid 
and supplied with different doses of potash, the contents of the 
crop in this substance show a distinct relation to the supply, 
except in the last trial with 25 kilograms of potash per tan, in 
which case the plants no longer consumed considerably more 
than in the preceding trial with 20 kilograms. Here certainly 
we reached the maximum limit of the diffusion of potash into 
normally developed rice plants. 
Just as in the nitrogen and phosphate series, the composition 
of the grain was also here less influenced by the manure than 
by the straw. While in the former the proportion between the 
lowest and highest content of potash was 100: 116, it was in 
the latter 100: 345. 
The following calculation shows how much potash was 
consumed from the manure : 
Potash per tan . 
Unman¬ 
ured. 
With¬ 
out 
potash. 
5 
kilo- 
grms. 
10 
kilo- 
grms. 
15 
kilo- 
grms. 
20 
kilo- 
grms. 
25 
kilo- 
grms. 
Potash, grammes per 
plot : 
In the grain. 
0.22 
1.21 
1.28 
1.46 
1.32 
1.47 
,, ,, straw. 
1.65 
2.9I 
5.08 
7 .°7 
9-25 
IO -77 
n.74 
» „ chaff. 
0.02 
0.66 
O 
00 
0.90 
0.69 
0.74 
0.79 
Total. 
i.8g 
4.78 
7.17 
9-25 
II.40 
12.83 
14.00 
In the crop produced with- 
out potash . 
— 
— 
4.78 
4.78 
4.78 
4-78 
4.78 
Assimilated from the ma- 
nure. 
2-39 
4-47 
6.62 
8.05 
9.22 
Applied in the manure 
Assimilated, per cent of the 
— 
— 
4-59 
vO 
w 
00 
x 3-77 
18.36 
22.95 
potash applied 
— 
— 
5 I -9 
48.7 
48.1 
43-8 
40.2 
