6 
MANURING EXPERIMENTS WITH PADDY RICE (THIRD YEAR). 
nitrogen because the stock of this nutrient in the soil, though 
very considerable, was not sufficient to secure a maximum crop. 
In iSgo there were consumed from the natural sources (soil, 
atmosphere, and water of irrigation) 5.66 grms. nitrogen per 
frame, in 1891 6.03 grms. i.e. practically the same quantity. 
Should this result be confirmed in the coming seasons, we 
should be entitled to conclude that under the conditions of our 
farm, paddy rice is capable of consuming 5.85 grms. of nitrogen 
per plot = 7.02 kilogrms. per tan. As according to former re¬ 
searches of ours, 62.2% of medium quantities of ammoniacal 
nitrogen enter the rice crop, the natural supply pro anno would 
be equal to 11.29 kilogrms. of ammoniacal nitrogen per tan, and 
would suffice for the production of 1.85 koku 3 of hulled grain. 
On the plots supplied with complete manure the following 
quantities of nitrogen applied in the form of ammonium sulphate 
entered the crop (in grms. per plot) : 
1889. 1890. 1891. 
In the whole crop .13.37 12.46 11.93 
In the crop grown without nitrogenous manure. 7.54 7.43 6.39 
Taken up from the manure .5.83 5.03 5.54 
Applied in the manure .g.18 9.18 8.33 
Taken up, per cent of the nitrogen applied ..63.0 54.8 66.5 
Thus in the average of the three years’ experiments carried 
out on the same plots, we find an “assimilation-factor” of 61.4 
for ammoniacal nitrogen, which figure is very near to the result 
of the experiments of 1889 on other plots with various quantities 
of ammonium sulphate from which 62.2% had been recovered in 
the crop. 
As to the assimilation of the phosphoric acid our researches 
gave the following results. 
3 i Koku — 180.39 litres. 
