MANURING EXPERIMENTS WITH PADDY RICE. 
18. 
IV. Series. Potash. 
Manure per tan : 
15 kilogrms. nitrogen, 25 
kilogrms. phosphoric 
acid, and the following 
quantities of potash : 
Straw. 
kilo¬ 
grms. 
Chaff. 
kilo¬ 
grms. 
Hulled 
grain, 
Straw. 
kilo¬ 
grms. 
Chaff. 
kilo¬ 
grms. 
Hulled 
grain, 
actually 
har¬ 
vested. 
kilo¬ 
grms. 
correct¬ 
ed 
yield. 
kilo¬ 
grms. 
actually 
har¬ 
vested. 
koku. 
correct¬ 
ed 
yield. 
koku. 
1) No poatsh .. 
77 8 
13 8 
506 
649 
207 
37 
3-56 
4 - 5 6 
2) 5 kilogrms. poatsh 
93° 
r 59 
586 
749 
248 
42 
4.12 
5.26 
3 ) 10 .. 
>» 
904 
191 
55 8 
840 
241 
51 
3-91 
5.90 
4 ) 15 » 
»J 
945 
I 57 
591 
745 
252 
4 2 
4.15 
5- 2 3 
5) 20 .. 
»> 
go 6 
155 
510 
700 
24I 
41 
3 - 5 8 
4.92 
6) 2 5 „ 
n 
986 
163 
586 
788 
262 
43 
4.12 
5’54 
Potash seems to be of less significance in our soil than the 
two other nutrients experimented on. Already 5 kilogrms. of it 
sufficed for a maximum produce and, as the ordinary manures 
used in practice mostly contain considerable proportions of it, 
special attention need not be bestowed upon it in soils similar 
to that of our farm. As, however, the stock of available potash 
varies much in soils of different geological origin, it is possible 
that in other districts a special supply of potassic manures may 
be efficacious, especially if the proper amounts of nitrogen and 
phosphoric acid are applied. 
