40 MANURING EXPERIMENTS WITH PADDY RICE (SECOND YEAR). 
the last year (62.2) ; for the farmyard manure alone, eliminating 
by calculation its content of night-soil, we find that 34% of its 
nitrogen will probably have entered the crop, which proportion 
will diminish in practical farming possibly to 20% because of 
the incomplete collection of the urine, and the insufficient 
fermentation ; the least quantity of nitrogen was consumed 
from the rice bran and the green manure, because the injuries 
inflicted by them on the young plants had weakened the latter 
so much that they did not produce a sufficient number of 
accessory stems and were therefore unable to consume the 
whole of the nitrogen which became available in the course of 
the decomposition of these manures; the straw had injured the 
plants so much that they were unable to consume the whole of 
the nitrogen which became available in the soil, the proportion 
of nitrogen in the whole crop being smaller than that in the 
crop grown without any nitrogenous manure. 
Although the general features of the assimilation-factors of 
the various nitrogenous fertilizers are similar to the rates of 
increase of hulled grain, we do not deem it proper to take them 
into account for our judgment on the manurial value of the 
fertilizers for rice. The proportion of nitrogen which enters 
the crops, is not necessarily connected with the production of 
grain or organic matter at all. Much depends on the period of 
growth during which the nitrogen becomes available ; too early 
and too late a consumption of the nitrogen by the crop alike 
unfavorable to the formation of grain. If much nitrogen 
is available in the beginning of the season the plants will send 
up numerous shoots which in a later period have, as a matter 
of course, an increased demand for nitrogenous food to complete 
their growth ; if then the nitrogen of the manure has already 
been exhausted, the final development of the plants will be less 
complete, and the general result will be a production of much 
straw and little grain. On the other side, if in the beginning 
of growth only a little nitrogen can be consumed and about the 
flowering time much, the plants will still take up that nitrogen 
and deposit it chiefly in the straw, but the quantity of the crop 
