MANURIRG EXPERIMENTS WITH PADDY RICE. 
2 9 
ammonia, without running the risk of losing any appreciable 
amount by the usual irrigation. As special experiments 13 with 
our paddy soil and with various manures have shown, nitrifica¬ 
tion does not take place in it while it is being irrigated, because 
of the deficiency of oxygen and the predominance of reducing 
processes. Otherwise, if nitrates were formed in paddy soils, 
a considerable part of them would certainly be washed away 
by the irrigation, and the rate of the nitrogen assimilation from 
the manure would probably fall even lower than in the dry 
fields, on which plants absorb in the first season after the 
application of ammoniacal salts according to our researches 11 
only 40 % of the nitrogen given.—From the large doses 12.5.— 
17.5 kilogrms. of nitrogen, however, some of the ammonia has 
been probably washed away as such, the absorptive power of 
soil being incapable of retaining such large quantities. The 
rice plants at least consumed in these trials considerably less 
of it, viz. 56, 53 and 48 % compared with the 62 % which were 
taken up from the 3 moderate doses. A small quantity was, 
however, still assimilated, even from the last additional 2.5 
kilogrms; the crop of the last trial (17.5 kilogrms.) contains 
per plot still 0.46 grms. nitrogen more than the preceding plot, 
while the increase in the manure was 2.3 grms.; 20 % of the 
latter additional quantity had accordingly still entered the 
plants. 
The percentage contents of the crops in phosphoric acid in 
the plots supplied with this nutrient were, as follows : 
13 Not yet published; preliminary trials in Landw. Versuchsstationen, 
1883, vol. 30, p 32. 
14 See Bulletin 6, p. 31. 
