Soil group | Parameter | H+ | Al3+ | Ca2+ | Mg2+ | K+ | Na+ |
Red soil (n = 109) | H+ | 1 |
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|
|
|
|
Al3+ | 0.219* | 1 |
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|
|
| |
Ca2+ | 0.081 | 0.002 | 1 |
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|
| |
Mg2+ | 0.046 | 0.043 | 0.420** | 1 |
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| |
K+ | 0.164 | 0.120 | 0.062 | 0.310** | 1 |
| |
Na+ | 0.104 | 0.019 | 0.364** | 0.314** | −0.095 | 1 | |
BSP | −0.074 | −0.504** | 0.668** | 0.555** | 0.170 | 0.455** | |
Yellow soil (n = 45) | H+ | 1 |
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|
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|
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Al3+ | 0.351** | 1 |
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|
|
| |
Ca2+ | 0.073 | 0.028 | 1 |
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|
| |
Mg2+ | −0.119 | 0.024 | 0.305* | 1 |
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| |
K+ | 0.147 | −0.007 | 0.222 | 0.079 | 1 |
| |
Na+ | −0.057 | −0.149 | 0.408** | 0.125 | 0.076 | 1 | |
BSP | −0.221 | −0.526** | 0.598** | 0.457** | 0.300* | 0.461** |