The purpose of this study was to study the possibility of using Mehlich No.3 (M3), and acidic ammonium acetate-EDTA (AA-EDTA) methods to replace the conventional methods of Bray No.1 and neutral ammonium acetate (AA) to test soil fertility. Thirty-eight soil series of Taiwan forest soil were selected for this study. The soil available phosphorus, potassium, calcium, and magnesium tested by M3 and AA-EDTA methods were linearly correlated to Bray No.1, and AA methods at the 0.1% significance level. The coefficients of correlation were all above 0.9 except for available phosphorus. The linear regression equations can be used to estimate the fertility level of soil tested by M3 and AA-EDTA methods, and we recommend their use as an index of the available nutrient status of soils.
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