MANURING EXPERIMENTS WITH PADDY RICE (SECOND YEAR). 
II 
substance in the better seasons. In fact high amount of 
potash in the ash and in the dry substance of the grain, is as 
a rule associated with high maturation, that is with high 
proportion of starch, whilst high proportion of phosphoric acid 
is generally associated with low maturation and high proportion 
of nitrogen.” Our observations on the growth of rice fully 
coincide with these remarks. 
To sum up the results of the two years’ experiments on rice, 
it may be stated : 
1) that through decomposition of soil ingredients and through 
irrigation, in the case of nitrogen also through rain and fixation 
from the air, there was rendered available to the crop in the 
course of one year per tan : 
6.1 kilogrms. of nitrogen, 
0.7 ,, ,, phosphoric acid, and 
3.3 ,, „ potash. 
2) In the better season of 1890 the exhaustion of the nitro¬ 
genous and phosphatic fertilizers was less, that of potash higher 
than in the preceding year, in which maturation was less 
complete. 
II. Series. 
WHAT IS THE EFFECT OF THE UNRE¬ 
COVERED PHOSPHORIC ACID ON 
THE SUCCEEDING CROP? 
These experiments were carried out on those plots which 
had received in 1889 various quantities of phosphoric acid in 
the form of sodium phosphate, besides much nitrogen as 
ammonium sulphate and much potash as carbonate. In order 
to ascertain how much of the phosphoric acid left by that 
crop in the soil was still available in the second season, we 
applied in 1890 per tan 11 kilogrms. of nitrogen as ammonium 
