12 MANURING EXPERIMENTS WITH PADDY RICE (SECOND YEAR). 
sulphate and n kilogrms. of potash as carbonate, but did not 
add any phosphoric manure. For the sake of comparison we 
may here also take into account the plots without phosphoric 
acid (p. 4) and those which in 1889 were left unmanured, but 
again received in 1890 a complete manure containing per 
tan 22 kilogrms. of phosphoric acid as sodium phosphate 
besides much nitrogen and potash. The quantities of phos¬ 
phoric acid used in the former season and the proportions left 
in the soil by that crop, as well as the produce in the second 
season are recorded in the following table : 
Phosphoric 
acid applied 
per piot in 
1889. 
grms. 
Phosphoric acid not 
recovered in the 
crop of 1889. 
Straw. 
1890. 
grms. 
Full grain 
1890. 
grms. 
Empty 
grain. 
1890. 
grms. 
Whole 
crop. 
1890. 
grms. 
grms. 
kilogrms. 
per tan 
0 
— 
— 
358 
260.9 
2.6 
622 
4-59 
3- 6 5 
4 - 3 8 
350 
272.9 
2-5 
625 
9.18 
6.99 
8 -39 
362 
269.4 
3-5 
6 35 
1377 
10.86 
13.04 
50° 
411.8 
0.9 
9 r 3 
18.36 
14.81 
1 7-77 
589 
480.6 
2.4 
1072 
22.95 
I 9 - 3 2 
23.18 
722 
524 - 1 
7-9 
I2 54 
27-54 
23.29 
27-95 
707 
587-3 
8-5 
I 3°3 
0 
18.36 8 
22.03 8 
975 
638.1 
7.6 
1621 
The two lowest quantities of phosphoric acid (4.59 and 9.18 
grms.) applied in 1889, of which only 20.5, resp. 22.8% had 
been consumed by the crop of that year, were accordingly 
without any effect on the crop of 1890, whereas the residues 
from larger doses (13.77— 2 7-54 g rms -) produced a distinct 
increase, which, however, with as large a proportion as 23.29 
grms. of residual phosphoric acid, did not come up to the 
maximum yield obtained with 18.36 grms. of freshly applied 
8 Applied in 1890; average of plots 12, 36, and 65. 
