39 
Table XV. — Effect of lime on availability of phosphoric acid in guanos. 
NO LIME. 
Source of phosphoric 
acid (P 2 5 ). 
Phos- 
phoric 
acid 
applied 
per 
pot. 
Oven-dry yield of individual pots. 
Average 
oven-dry 
yield and 
probable 
error. 
Efficiency 
of phos- 
phoric 
acid 
as com- 
pared 
with 
that 
of acid 
phos- 
phate in 
the same 
soil. 
Efficiency 
of phos- 
phates 
and 
guanos 
in limed 
soil com- 
pared 
with that 
of acid 
phos- 
phate in 
unlimed 
soil. 
Gm. 
Gm. 
38.3 
58.2 
70.0 
80.6 
90.0 
73.9 
50.1 
59.6 
54.7 
63.2 
68.2 
76.6 
66.1 
52.6 
59.6 
50.5 
72.3 
Gm. 
42.1 
52.2 
70*5 
87.0 
66.7 
53.3 
60.4 
64.3 
68.4 
70.1 
72.4 
68.0 
46.9 
69.1 
49.0 
75.2 
Gm. 
42.1 
55.8 
64.3 
88.1 
89.9 
74.7 
48.9 
63.8 
62.8 
65.4 
71.2 
65.0 
62.5 
50.8 
60.6 
50.1 
64.9 
Gm. 
41.9 
54.7 
71.6 
75. 5 
85.6 
68.6 
54.9 
56.5 
60.2 
61.9 
61.9 
64.1 
60.6 
51.4 
62.3 
49.6 
74.3 
Gm. 
37.3 
59.5 
73.3 
66.2 
90.1 
65.7 
62.7 
65.0 
42.8 
58.9 
71.1 
61.3 
59.7 
49.4 
54.9 
50.8 
66.1 
Gm. 
41.5 
52.5 
66.3 
73.4 
88.3 
73.3 
59.1 
66.5 
62.9 
64.0 
66.8 
72.3 
69.8 
Gm. 
40.4±0.6 
55. 5± .8 
69. 2± .9 
75.7±2.1 
88. 5± .5 
70.5±1.1 
54.8±1.4 
62.0±1.0 
58.0±2.3 
63. 6± .9 
68.2±1.0 
68. 6±1. 6 
64.5±1.1 
50. 2± .7 
61.3±1.5 
50. 0± .2 
70.6±1.3 
0.40 
.80 
1.40 
2.10 
3.00 
8.00 
1.00 
6.00 
3.00 
4.50 
3.00 
5.00 
7.00 
2.00 
3.00 
1.00 
Do 
Do 
Do 
31 
5 
59 
8 
21 
17 
26 
13 
4 
29 
8 
93 
Floats 
Basic slag 
Guano No. 811A 
Guano No. 842 
Guano No. 851 
Guano No. 860 
Guano No. 889 
Guano No. 923 
Guano No. 957 
Guano No. 966B 
Guano No. 977 
, 
AIR-SLAKED LIME, 10 GRAMS PER POT. 
36.3 
49.5 
55.8 
74.6 
77.2 
38.0 
39.1 
50.8 
61.2 
45.1 
53.5 
36.9 
41.6 
50.1 
57.4 
43.9 
54.8 
34.7 
53.2 
62.9 
73.2 
79.4 
43.8 
38.8 
47.7 
57.4 
33.4 
55.7 
43.3 
46.6 
50.1 
62.7 
49.1 
57.3 
39.3 
51.2 
48.3 
69.2 
81.2 
40.6 
33.4 
50.9 
60.2 
36.2 
49.6 
40.2 
39.4 
47.3 
64.7 
54.1 
51.1 
42.9 
46.9 
59.7 
70.0 
73.9 
45. 5 
37.8 
48.6 
65.9 
42.3 
48.6 
40.6 
42.0 
47.7 
59.4 
51.0 
54.0 
22.3 
46.9 
62.5 
81.7 
76.8 
55. 4 
36.8 
56.8 
61.7 
43.6 
57.7 
42.7 
47.8 
51.6 
63.7 
53.4 
57.2 
43.8 
49.7 
62.3 
84.1 
80.9 
46.3 
45.7 
57.7 
59.3 
44.3 
57.2 
46.2 
47.6 
45.8 
66.7 
37.5 
54.6 
36.6±2. 1 
49. 6± .7 
58.6±1.6 
75.5±1. 7 
78. 2± .8 
44.9±1.6 
38.6±1.1 
52.1±1.1 
61. 0± .8 
40.8±1.3 
53.7±1.1 
41. 7± .9 
44.2±1.0 
48. 8± .6 
62. 4± .9 
48.2±1.7 
54. 8± .6 
Acid phosphate 
0.40 
.80 
1.40 
2.10 
3.00 
8.00 
1.00 
6.00 
3.00 
4.50 
3.00 
5.00 
7.00 
2.00 
3.00 
1.00 

Do 
Do 
Do 
y 
1 
51 
15 
4 
13 
5 
5 
6 
47 
12 
63 
4 
Floats 

Basic slag 
31 
Guano No. 811 A 
9 
Guano No. 842 

Guano No. 851 
8 
Guano No. 860 
Guano No. 889 

2 
OiiR.no No. 923 . 
3 
Guano No. 957 
Guano No. 966B 
Guano No. 977 
30 
7 
38 
