3 + 
VI b Rape cake 
»» e ï» h 
Nitrogen 
per 
hektare. 
kilogrms. 
Produce 
on each 
plot, 
grms. 
in the 
average 
grms. 
5 ° 
55 5 
47.0 
51.2 
VII c Rape cake 
VIII a Fish manure 
„ b Fish manure 
IX a Fish manure 
n c 11 ï» • * * 
100 
5 ° 
»» 
100 
J» 
79 
55 
55 
57-5 
60.5 
79 
55 
59 
X a Steamed bone dust 
*» ^ yy yy yy 
yy C yy y y yy 
120 
» » 
6 5 
76 
61 
67-3 
The decomposition and dissolution of organic manures is 
accelerated, according to our experiments, by the climatic condi¬ 
tions of Japan to such an extent that the nitrogen of fertilizers, 
like fish manure and steamed bone dust, displays its entire effect 
within half a year. The rapidity with which ammoniacal 
manures undergo nitrification, the danger of losing them by 
rain, and the necessity of applying them consequently in several 
doses and of spending much labour on this mode of repeated 
manuring,—all these facts enhance the relative value of the 
organic nitrogenous fertilizers, such as fish manure, bones, 
waste products from manufacturing processes, green manures, 
etc., the whole quantity of which can be safely applied in one 
dose, and secures a regular and constant supply of nitrogen to 
the crops. From this point of view it is also not advisable to 
mix, as some factories are beginning to do in Japan, easily soluble 
nitrogenous manures, such as chilisaltpeter and ammoniacal 
salts, with artificial phosphatic and potassic fertilizers, the whole 
quantity of which latter is generally applied before sowing. 
Owing to the small number of zinc cylinders available last 
year, our experiments have a merely preliminary character. We 
shall, however, fortunately be able to repeat them in the coming 
season with a greatly increased number of vessel i, and hope with 
the experience gathered in the last year, to attain to greater 
accuracy than in the preceding researches. 
