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- [4] COMPARISON OF SEVERAL SPATIAL PREDICTION METHODS FOR SOIL-PH JOURNAL OF SOIL SCIENCE, 1987, 38 (02): : 325 - 341
- [5] OXIDATION AND REDUCTION OF MN IN ACIDIC SOILS - EFFECT OF TEMPERATURE AND SOIL-PH SOIL BIOLOGY & BIOCHEMISTRY, 1987, 19 (02): : 143 - 148