6 MANURING EXPERIMENTS WITH PADDY RICE (SECOND YEAR). 
Nitrogen 
extracted 
from the 
Nitrogen 
in the 
Nitrogen 
soil resp. 
dry matter of 
in the 
from the 
the whole crop. 
manure. 
soil and 
A 
grms. 
manure. 
C /o 
grms. 
grms. 
Unmanured, 
1889 
•••MSS 
3-84 
0 
3-47 
>> 
1890 
...1.078 
5.66 
0 
3-89 
Without nitrogen, 
1889 
...1.054 
7-54 
0 
7.17 
>> >> 
1890 
...0.937 
7-43 
0 
5.66 
Complete manure, 
1889 3 4 
...1.096 
x 3*37 
9.18 
13.00 
1890 
...0.943 
12.46 
9.18 
10.6g 
The results obtained on the plots without nitrogenous 
manure give evidence that the exhaustion of the soil by the 
plants of 1889 involved a smaller supply of nitrogen to the 
succeeding crop. While the former consumed 7.17 grms. of 
nitrogen, the latter took up only 5.66 grms. The diminution 
of the stock of assimilable nitrogen caused by the crop of 
1889 was accordingly not completely compensated by the 
subsequent decomposition of organic nitrogenous soil ingredi¬ 
ents during the winter and spring 1889—90. Nevertheless, 
the conversion of nitrogenous matter previously unfit for the 
nutrition of rice, into assimilable compounds during the 
interval between the two crops was not insignificant. Assum¬ 
ing the assimilable ingredients to exist in the form of 
ammoniacal compounds from which rice is enabled, according 
to our researches, to consume 62.2 %, the soil must have 
contained per tan in 1889 13.85* kilogrms. of available 
nitrogen. As from this quantity 7.82 kilogrms. were actually 
consumed by the plants, only 6.03 kilogrms. were left for the 
succeeding crop, and from this amount only 3.02 kilogrms. 
could enter the plants. In the crop of 1890 we found, however, 
6.79 kilogrms., hence 3.77 kilogrms. came from natural sources. 
Assuming this quantity to have also been taken up from 
3 Average of plots 3, 15, and 22 of 1889. 
4 In bulletin No. 8 erroneously stated to be 12.57 kilogrms. 
