26 MANURING EXPERIMENTS WITH PADDY RICE. 
trials in the dry matter the following quantities of crude 
protein (per cent.) : 
Total 
Grain. 
Straw 
crop 11 
Unmanured .13.94 
7.78 
8.97 
Without phosphoric aci ...14.45 
8.66 
9.76 
he plants of these trials had absorbed 
much of the available 
nitrogen from the soil resp. manure, nevertheless they remained 
dwarfs, because the quantity of phosphoric acid did not suffice 
for a better development. The total production of organic 
matter was dependent on these trials upon the phosphatic 
ingredients of the soil, which in respect to the other factors of 
growth were in the relative mimimum. Thus the somewhat 
striking result was that the unmanured plants produced grain 
and straw richer in nitrogenous substances than those supplied 
even with the largest quantities of nitrogenous manures 
(17.5 kilogrms. per tan) but in conjunction with sufficient 
phosphoric acid. 
On the other hand, the lowest proportions of nitrogenous 
substances in the grain and straw were found in that trial 
in which much phosphoric acid but no nitrogen had been 
applied, the percentage amounts of crude protein being in the 
dry matter 
of grain.10.71 % 
>, straw.4.33 ,, 
,, the total crop 11 .6.59 ,, 
As in this case the nitrogen was in the relative minimum 
among the essential nutrients, the total production of organic 
substance depended on this factor, and the plants made the 
most complete use of this nutrient, with the result that in 
the mature crop the percentage amount of nitrogenous subst¬ 
ances was the lowest. 
When to a manure, complete in other respects, different 
quantities of nitrogen were added, the mature crop became the 
richer in this ingredient, the larger the quantity supplied. 
ii Chaff included. 
