MANURING EXPERIMENTS WITH PADDY RICE (SECOND YEAR). 3 
I. Series. 
HOW MUCH NITROGEN, PHOSPHORIC ACID, AND 
POTASH IS TAKEN UP FROM THE SOIL ON 
THOSE PLOTS ON WHICH RICE HAD AL¬ 
READY BEEN CULTIVATED IN THE 
PRECEDING YEAR WITHOUT THE 
APPLICATION OF THESE 
NUTRIENTS ? 
In this series we intended to ascertain whether the consump¬ 
tion of nutrients by the first crop reduces their stock so far that 
the succeeding crop finds appreciably less in the soil, or 
whether the natural decomposition of the soil constituents 
during the winter and spring supplies fresh nutrients to the 
crop. The series comprised 15 plots which were manured as 
follows : 
x) 3 plots were left unmanured. 
2) 3 ,, did not receive any nitrogenous manure, but 
were supplied with much phosphoric acid (22 kilogrms. 
per tan 1 ) and (11 kilogrms.) potash. 
3) 3 plots received a manure free from phosphoric acid 
containing much (11 kilogrms.) nitrogen and (11 kilo¬ 
grms.) potash. 
4) 3 plots were not supplied with potash, but received much 
(22 kilogrms.) phosphoric acid and (11 kilogrms.) nitrogen. 
5) 3 plots received a complete manure containing 11 
kilogrms. nitrogen, 22 kilogrms. phosphoric acid, and 11 
kilogrms. potash. 
In all these experiments the nitrogen was applied as am¬ 
monium sulphate, the phosphoric acid as sodium phosphate, 
and the potash as carbonate. 
The best development took place on the plots which had 
received all three nutrients ; compared with these the plants 
without potash were only slightly inferior ; next in order of 
1) i tan — 0.0992 hectare; 1 koku = 180.39 litres. 
