XIV, 5 
Yates: Growth of Hevea Brasiliensis 
509 
The samples were taken at a depth of about 30 to 40 cen- 
timeters. Sample 1 was taken from a block planted to Para 
rubber in which the growth of the trees was very poor. The 
trees presented an unhealthy, ill-nourished appearance. It is 
interesting that analysis of the soil from this block showed it to 
be low in all inorganic substances necessary for plant growth. 
In Table VI are given analyses of other soils from the Min- 
danao region of the Philippines, in Table VII analyses of Ceylon 
soils are tabulated for comparison, and in Table VIII analyses 
of soils from the Federated Malay States are given. The Ma- 
layan soils are characterized by their richness in nitrogen. 
Table VI. — Philippine soils. “ 
Cotabato. 
Fort 
Pikit, 
10 to 40 
cm. 
Lake 
Lanao, 
north 
side; 
10 to 40 
cm. 
Lake 
Lanao, 
south 
side; 
10 to 40 
cm. 
Saran- 
gani, 
10 to 40 
cm. 
Sample No 
161 
159 
150 
153 
166 
Moisture. - _ - . 
8.35 
18. 47 
16. 61 
3.56 
4. 48 
Loss on ignition _ . 
10.16 
11.39 
19.47 
7.30 
5. 58 
Nitrogen (N) , , _ . 
0.207 
0. 184 
0.216 
0. 173 
0.115 
Phosphoric anhydi-ide (P 2 O 6 ) - - . . 
0. 142 
0. 196 
0. 180 
0. 097 
0. 188 
Lime (CaO) _ , 
0.87 
1. 92 
0. 37 
2.24 
3.18 
2.31 
0. 26 
0.71 
Potash (K 2 O) 
0. 29 
0..55 
0. 240 
0. 173 
0.24 
0. 76 
3. 25 
2. 12 
2 55 
2 17 
0. 0036 
0. 0022 
0. 0072 
0. 0000 
2.29 
Coarse sand, 1. 0 to 0. 5 mm . 
0.99 
2.61 
3.81 
5.76 
4.33 
13.20 
27 68 
19. S7 
Fine sand, 0. 25 to 0. 10 mm _ . _ 
7. 11 
18. 80 
24.81 
25,84 
Very fine sand, 0. 10 to 0. 05 mm 
13.81 
13. 82 
18.09 
18.08 
59. 30 
28. 48 
20.46 
23 20 
Clay, less than 0. 005 mm 
14.11 
23.61 
5.35 
7. 89 
99.65 
100.52 
100. 19 
100. 14 
■‘Cox, Philip. Journ. Sci. § A 6 (1911) 279-330, from Table VIIX, p. 309, and Table IX, 
pp. 314 and 315. 
