MANURING EXPERIMENTS WITH PADDY RICE. 
*7 
exceptionally rich in available nitrogen and that the ammo¬ 
nium sulphate applied constitutes the most easily assimilable 
form of this nutrient, whereas the ordinary nitrogenous fertili¬ 
zers, brans, rape cake, green plants, farmyard manure, etc., 
are sure to be less accessible to the roots and may act at a 
lower rate on the crop. Hence other soils will certainly require 
more nitrogen than 7.5 kilogrms. 
III. Series. Phosphoric Acid. 
Manure per tan : 
15 kilogrms. nitrogen, 20 
kilogrms. potash, and the 
following quantities of 
phosphoric acid : 
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) Nophosphoric acid 
210 
25 
80 
Il6 
5 6 
7 
0.56 
0.82 
2) 5 kilogrms. ,, 
454 
71 
252 
342 
I 21 
1 9 
1.77 
2.40 
3) 10 
1) 
671 
”7 
445 
583 
179 
31 
3-13 
4.10 
4) x 5 » >> 
»> 
830 
x 47 
522 
685 
221 
39 
3-66 
N 
00 
"T 
5) 20 „ „ 
>» 
918 
163 . 
5 6 5 
749 
244 
42 
3-97 
5.26 
6) 25 „ „ 
»» 
906 
155 
510 
700 
24I 
41 
3-5 8 
4.92 
7) 30 .. 
1J 
1036 
167 
578 
790 
276 
45 
4.06 
5-55 
The results of this series again exhibit with great distinct¬ 
ness the importance and efficacy of phosphatic manures on 
our soil. Every 5 kilogrms. of this nutrient, up to an applica¬ 
tion of 10 kilogrms., increased the actual yield of hulled grain 
by nearly 200 kilogrms. (1.3 koku) per tan, and if altogether 15 
kilogrms were applied 80-100 more kilogrms. were harvested. 
This shows that a quantity between 10 and 15, i. e. 12.5 kilo¬ 
grms. of that nutrient in an easily soluble form will answer the 
purpose very well and secure an economical result. If phos¬ 
phoric acid can be procured at low rates, every judicious farmer 
will follow our advice and apply rather more, especially if his 
farm is in a district well suited for rice cultivation. 
