MANURING EXPERIMENTS WITH PADDY RICE. 
15 
and will, of course, be attained only exceptionnally, as a small 
number of flowers always remain sterile. On the other side, 
the figures for the actual yield of hulled grain represent an ex¬ 
ceptionally low produce, such as was obtained after great injury 
from a hurricane and cold weather in the flowering period. 
The maximum yield obtainable in practice will accordingly lie 
between the “actual” and “ corrected” yields of the following 
tables. 
I. Series. Unmanured, and Partial Manures. 
Manures. 
Straw. 
kilo¬ 
grms. 
Chaff. 
kilo¬ 
grms. 
Hulled grain, 
Straw. 
kuwam- 
me. 
Chaff. 
kuwam- 
me. 
Hulled 
grain, 
actually 
har¬ 
vested. 
kilo¬ 
grms. 
correct¬ 
ed 
yield. 
kilo¬ 
grms. 
actually 
har¬ 
vested. 
koku. 
correct¬ 
ed 
yield. 
koku. 
1) Unmanured 
212 
29 
95 
131 
57 
8 
0.67 
O.92 
2) Without phos- 
phoricacid.. 
210 
25 
80 
Il6 
56 
7 
0.56 
0.82 
3) Without nitrogen. 
500 
88 
331 
43 ° 
133 
23 
2.33 
3.02 
4) ,, potash.. 
778 
138 
506 
649 
207 
37 
3-56 
4.56 
The yield obtained from the unmanured plots distinctly 
shows that our soil is really in an exhausted condition and 
incapable of producing a satisfactory crop without appropriate 
manure. While the farmers in our neighbourhood obtain on 
an average per tan 1.8-2.0 koku (250—290 kilogrms.) of hulled 
grain, our unmanured soil gave far less. The application of 
much nitrogen and potash without a supply of phosphoric acid 
(trial No. 2) did not increase the crop beyond that obtained 
without any manure, and even interfered with the formation of 
grain, while hardly altering the produce of straw. A very 
considerable increase of grain and straw was caused (in trial 
No. 3) by the application of phosphoric acid and potash in the 
absence of any nitrogenous manure. This result indicates that 
our soil is poor in phosphoric acid, but contains enough available 
nitrogen for a yield surpassing the general average obtained 
