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STUDIES ON SOIL POTASSIUM .I. CONFIRMATION OF RATIO LAW - MEASUREMENT OF POTASSIUM POTENTIAL
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BECKETT PHT, 1967, 8 T INT C SOIL SCI
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BOLT G. H., 1963, SOIL SCI SOC AMER PROC, V27, P294
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STUDIES ON SOIL POTASSIUM .3. CAT-ON ACTIVITY RATIOS IN ACID NIGERIAN SOILS
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STUDIES ON SOIL POTASSIUM .4. EQUILIBRIUM CATION ACTIVITY RATIOS + RESPONSES TO POTASSIUM FERTILIZER OF NIGERIAN OIL PALMS
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VAN SCHOUWENBURG J. CH., 1963, NETHERLANDS JOUR AGRIC SCI, V11, P13