Table 4: Change in Calcium, Magnesium, Potassium and Sodium Contents (centimoles of charge per kilogram of soil) with rainfall. "SUM" refers to the sum of bases. Note that in the Hilo soil pH remains relatively high even when the sum of bases is very low.
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Waikoloa Series 30-40" Annual Rainfall | Paahau Series 60-80" Annual Rainfall | Hilo Series 175-200" Annual Rainfall | ||||||||||||||||||
depth (cm) | Ca | Mg | K | Na | SUM | pH | depth (cm) | Ca | Mg | K | Na | SUM | pH | depth (cm) | Ca | Mg | K | Na | SUM | pH |
0-13 | 27.9 | 7.8 | 4.80 | 0.40 | 40.9 | 6.6 | 0-25 | 14.8 | 4.5 | 0.28 | 0.42 | 20.0 | 5.8 | 0-38 | 2.6 | 2.2 | 0.2 | Tr. | 5.0 | 5.4 |
13-25 | 28.0 | 6.4 | 5.60 | 0.40 | 40.4 | 7.1 | 25-45 | 9.9 | 3.5 | 0.10 | 0.44 | 13.9 | 6.4 | 38-48 | 1.4 | 0.3 | 0.1 | 0.1 | -- | 5.9 |
25-50 | 32.6 | 7.1 | 4.80 | 0.80 | 45.3 | 7.3 | 45-70 | 7.2 | 3.3 | 0.09 | 0.28 | 10.9 | 6.4 | 48-50 | 0.9 | 0.1 | 0.1 | Tr. | -- | 6.0 |
50-63 | 34.6 | 9.8 | 3.00 | 1.10 | 48.5 | 7.5 | 70-85 | 4.9 | 2.2 | 0.08 | 0.24 | 7.4 | 6.3 | 50-58 | 0.9 | 0.1 | Tr. | 0.1 | -- | 5.9 |
63-78 | 33.3 | 12.8 | 0.60 | 1.60 | 47.7 | 7.6 | 85-118 | 4.2 | 1.7 | 0.10 | 0.25 | 6.3 | 6.5 | 58-80 | 1.8 | 0.3 | Tr. | 0.1 | -- | 6.1 |
78-98 | 33.0 | 15.9 | 0.30 | 2.20 | 49.2 | 7.8 | 118- 143 | 4.6 | 1.6 | 0.09 | 0.27 | 6.6 | 6.5 | 80-85 | 1.5 | 0.1 | Tr. | Tr. | -- | 6.4 |
98-125 | 34.0 | 12.4 | 0.50 | 5.40 | 52.3 | 8.l | 143 | 4.7 | 1.4 | 0.02 | 0.19 | 6.3 | -- | 85-100 | 1.4 | 0.1 | Tr. | Tr. | -- | 6.2 |
125- 163 | 33.3 | 14.4 | 1.30 | 6.10 | 55. | 8.2 | 100-133 | 0.6 | 0.1 | Tr. | Tr. | -- | 6.2 | |||||||
133- 153 | 1.6 | 0.1 | Tr. | 0.1 | -- | 6.1 |