转折点 | pH | CEC | 有机质 | 全氮 | 碱解氮 | 全磷 | 有效磷 | 全钾 | 速效钾 | 蔗糖酶 | 脲酶 | 酸性磷酸酶 | 过氧化氢酶 |
x1 | 4.0 | 5 | 6 | 0.5 | 60 | 0.2 | 3 | 6 | 30 | 0.85 | 0.02 | 23.33 | 0.04 |
x2 | 4.5 | 20 | 40 | 2 | 200 | 1 | 40 | 30 | 200 | 11.11 | 0.55 | 296.12 | 0.70 |
x3 | 6.0 | - | - |
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x4 | 7.0 | - | - |
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