AQUICULTURE AND DENDROLOGY. 
7 
These yields appear very high. As already stated, the 
fact that the water used for irrigating the frames was warmed 
by the sun has in all probability had some effect on the growth. 
The average yield of irrigated rice about Tokio approximates 60 
bushels of unhulled grain to the acre, and in the best rice 
growing districts the crop occasionally reaches 120 bushels to 
the acre. So it will be seen that, considering the quantities 
of fertilizers applied, the figures are not greatly at variance 
with the results obtained in practice. The yield at the rate of 
80 bush. pr. acre, obtained in No. 13, is about one fourth higher 
than the crops gathered from adjoining rice fields. 
In table III the yield in No. 13 is taken as the standard of 
comparison. The order of arrangement being the same as that 
given in the last table; the names of the fertilizers are omitted 
for the sake of brevity. The standard weights of manures pr. 
frame are those given for Nos. 1,2 and 3. (see table I.) corres¬ 
ponding respectively to 520 lbs. sulphate of ammonia, 4^^ lbs. 
superphosphate and lbs. carbonate of potassium pr. acre. 
The only variation these quantities was that they were in 
some cases doubled, and thus applied singly or in pairs or 
all together; in the latter case forming a complete fertilizer, 
a term used in table III for the sake of brevity. Taking 100 
to represent the unmanured plat, column 1 gives the compara¬ 
tive yield of manured plats ; column 2, the number of panicles 
in each plat (180 plants were set in each) ; column 3 gives the 
increase in the number of panicles by tillering ; column 4 gives 
the weight of 1,000 sound grains ; column 5 gives the weight 
of one Go (a small Japanese measure); column 6 the percentage 
of grain to the total weight of the crop, and column 7 the 
weight of grain per panicle. The weights are in grams. 
