3 ° 
EXPERIMENTS ON THE EFFECT OF 
According to these figures the yield of dry matter and nitrogen 
is in the average of every three plots that received the same 
manure, as follows 1 : 
Nitrogenous 
manure. 
Nitrogen 
applied 
per 
hektare. 
kilogrms. 
Dry matter harvested. 
Nitrogen assimilated 
grms. 
surplus 
over the 
plots No I. 
grms. 
grms. 
surplus over 
the plots No I 
grms. 
I. Without nitrog. manure 
O 
127.6 
— 
CO 
xf- 
— 
II. Ammonium sulphate .. 
30 
172.O 
44.4 
r -495 
°-357 
HI. 
60 
196.5 
6S.9 
1.789 
0.641 
IV. Night-soil . 
40 
186.7 
59.1 
1.615 
0.467 
V 
v • »» »» 
80 
263.1 
135-5 
2.086 
0.938 
VI. Rape cake . 
50 
I 37 - 8 
10.2 
[.198 
O.O5O 
vu. „ .. 
IOO 
183.9 
5 6 -3 
1.854 
0.646 
VIII. Fish manure . 
5 ° 
203.0 
75-4 
1.843 
0.695 
IX. „ 
IOO 
283-7 
156.1 
2.4O9 
1.261 
X. Steamed bone dust.... 
120 
364-5 
236.9 
3.012 
1.864 
On considering these results we notice that in all trials except 
those with rape cake, the nitrogenous fertilizers have remarkably 
increased the yield of dry matter. In the patches with night-soil 
and fish manure this increase is fairly proportionate to the 
amount of nitrogen applied, and in the trials with ammonium 
sulphate the results approach the same proportion. The 
strikingly low effect, exerted by the rape cake may be possibly 
explained as a consequence of an exceptionally high temperature 
applied to the seed before they had been pressed ; if such strong 
heat is applied as to convert the material into a more or less 
brown mass, the nitrogenous substances become insoluble and 
4 In this calculation the trials Vc, VIIIc, IXc and Xa have been omitted, 
owing to their considerable deviation from the two other parallel experiments. 
