22 MANURING EXPERIMENTS WITH PADDY RICE (SECOND YEAR). 
Phos* 
Produce per plot 
Hulled grain per tan 
Kind of 
phoric 
Full 
Empty 
Whole 
surplus 
acid 
kilo- 
the plot 
without 
phosphate 
per tan 
Straw 
grain 
grain 
crop 
phos¬ 
phoric 
kilo- 
acid 
koku . 
kilo- 
grms. 
grms. 
grms. 
grms. 
grms. 
grms. 
grms. 
Without phosphoric 
acid. 
0 
373 
263.4 
3-3 
639 
255 
1.79 
— 
Sodium phosphate | 
4.40 
481 
378-5 
5-5 
863 
367 
2-58 
11 2 
8.80 
645 
531-0 
5-7 
1182 
514 
3.61 
259 
Double superphos-j 
4.67 
651 
507.8 
7-9 
1167 
492 
3-46 
237 
phate 1 
9-34 
766 
615.5 
9.2 
1391 
596 
4.19 
341 
Precipitated f 
5 - 5 ° 
7 11 
570.8 
4-7 
1287 
553 
3-89 
298 
calcium phos-I 
679.2 
12.8 
658 
phate ( 
f 
I I.OO 
go i 
J 593 
4.62 
403 
8.36 
567 
40 Q .2 
4-3 
VO 
CO 
H 
396 
2.78 
I 4 I 
Peruvian guano .. j 
16.72 
621 
458.2 
5-5 
1085 
444 
3.12 
189 
f 
8.26 
623 
476.2 
5.8 
I IO5 
461 
3-24 
206 
Thomas phosphate j 
16.52 
785 
585.6 
IO.4 
CO 
m 
H 
567 
3-98 
312 
8.26 
652 
492.5 
8.8 
1154 
477 
3-35 
222 
Steamed bone dust • 
16.52 
821 
644.1 
12.6 
1478 
624 
4-38 
369 
Crude bone dust j 
8-26 
663 
522.4 
10.3 
1196 
506 
3 - 5 6 
25 r 
16.52 
925 
7 I 7-8 
16.9 
1660 
695 
4.88 
440 
Bone ash .. .. j 
8.26 
502 
388.8 
4.9 
896 
377 
2.65 
122 
16.52 
654 
522.7 
5.6 
1183 
5°6 
3 - 5 6 
251 
8.26 
409 
3 I 9-7 
3-2 
731 
310 
2.18 
55 
Phosphorite.. 
16.52 
381 
313-6 
2.9 
698 
3°4 
2.14 
49 
It is thus seen that in all the trials the phosphatic manure 
increased the yield of straw and grain, and that the yield 
produced by the larger amount of phosphoric acid was con¬ 
siderably higher than that obtained with the smaller quantity. 
This proves that the smaller doses of phosphoric acid display¬ 
ed throughout all trials their full action and that the increase 
obtained with them over the plot without phosphoric acid, 
gives a reliable measure of the relative value of the various 
phosphates applied. As in paddy fields rice is mostly the only 
crop cultivated and as the farmer determines the value of the 
