214 
pounds of phosphoric acid and 28 pounds of potash. A good 
crop, yielding 4,000 pounds of grain, removes about 40 pounds 
of nitrogen, 25 pounds of phosphoric acid and 40 pounds of 
potash. The proportion removed by the grain and the straw 
respectively are also given. In these experiments the three es- 
sential elements were applied to the soil at the rate of about 90 
pounds of each to the acre. The nitrogen was applied as am- 
monium sulphate, the phosphoric acid as double superphosphates, 
and the potash as potassium carbonate. The plants receiving 
the complete fertilizer yielded best ; the next best yield came from 
the plants to which no potash was supplied ; and the next best, 
from those to which no nitrogen was supplied. The poorest 
yields came from those which had no phosphoric acid. This indi- 
cated that the soils under consideration lacked phosphoric acid 
most, nitrogen to a less degree, and potash least of all. It also 
indicated that for the production of every 100 kilos of rice paddy 
CULTURAL POTS USED BY THE JAPANESE AGRICULTURAL EX- 
PERIMENT STATION. 
Figs. 1 2 3 4 5 6 7 
Fig. 1. Glass cylinder about 4"x8" in size, used for sand cultures. 
2. Glass cylinder about 3"x8" in size, used for water cultures. 
3. Wire basket pots (after Whitney) about 4"x4", used for 
transparation method of determining growth. 
4. Porcelain beakers, about 5"x6", used for growing single seed- 
lings to maturity, but considered too small for best results. 
5. Improvised earthware cultural pot, considered too shallow for 
best results, about 14"x9" in size. 
6. One of the earlier type of ‘| Wagner” porcelain culture pots, 
10"xl2" in size. 
7. Heavy galvanized iron culture pot of approved design, but 
not suited for use with fertilizers containing acid con- 
stituents. 
