Table 1 Summary of topsoil (0-20 cm depth) properties at the different study areas; means and coefficients of variation (in parentheses) are provided.
From: Forest nutrition and fertilization in teak (Tectona grandis L.f.) plantations in Central America†
Northern region, Costa Rica (n = 11) | Guanacaste, Costa Rica (n = 9) | Canal Zone, Panama (n = 3) | TOTAL (n = 23) | TOTAL** (kg ha-1) | |||||
|---|---|---|---|---|---|---|---|---|---|
pH | 5.11 | (6) | 5.90 | (6) | 6.70 | (12) | 5.63 | (12) | |
Acidity (cmol(+) L-1) | 0.70* | (5) | 0.31 | (30) | 0.15 | (33) | 0.48 | (81) | |
Ca (cmol(+) L-1) | 4.45 | (44) | 21.36 | (28) | 20.97 | (38) | 13.22 | (74) | 5288 |
Mg (cmol(+) L-1) | 1.46 | (47) | 6.89 | (54) | 5.25 | (64) | 4.08 | (89) | 1142 |
K (cmol(+) L-1) | 0.13* | (109) | 0.33 | (87) | 0.36 | (82) | 0.24 | (101) | 187 |
ECECa (cmol(+) L-1) | 6.74 | (31) | 28.90 | (32) | 26.72 | (40) | 18.02 | (71) | |
ASb (%) | 11.96* | (84) | 1.22 | (58) | 0.65 | (55) | 6.28* | (139) | |
P (mg L-1) | 3* | (114) | 3* | (146) | 2* | (0) | 3* | (124) | 6 |
Zn (mg L-1) | 2* | (84) | 3 | (58) | 3 | (107) | 2* | (77) | 4 |
Cu (mg L-1) | 8 | (19) | 11 | (85) | 4 | (83) | 9 | (71) | 18 |
Fe (mg L-1) | 165 | (23) | 37 | (81) | 65 | (154) | 102 | (75) | 204 |
Mn (mg L-1) | 43 | (171) | 38 | (82) | 19 | (101) | 38 | (142) | 76 |
Organic matter (%) | 4.6 | (27) | 3.8 | (28) | 4.6 | (16) | 4.3 | (27) | |
Sand (%) | 24.9 | (23) | 23.4 | (56) | 29.0 | (31) | 24.8 | (38) | |
Silt (%) | 18.4 | (13) | 36.9 | (42) | 36.8 | (43) | 28.0 | (51) | |
Clay (%) | 56.7 | (11) | 39.7 | (22) | 34.3 | (50) | 47.1 | (27) | |