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- [6] REPORT ON HYDROGEN-ION CONCENTRATION OF SOILS JOURNAL OF THE ASSOCIATION OF OFFICIAL AGRICULTURAL CHEMISTS, 1951, 34 (03): : 588 - 589
- [7] The hydrogen-ion concentration of heavy alkaline soils JOURNAL OF AGRICULTURAL SCIENCE, 1923, 13 : 321 - 332
- [8] On the colorimetric determination of hydrogen-ion concentration in soils JOURNAL OF AGRICULTURAL SCIENCE, 1923, 13 : 69 - 73