Phosphate adsorption characteristics of some Malaysian soils, 2: relationships with other soil properties
1983
Abdul Rashid Ahmad (Institut Penyelidikan dan Kemajuan Pertanian Malaysia, Serdang, Selangor. Soil Science Branch) | Foster, H.L.
An attempt was made to relate phosphate adsorption capacities estimated from Freundlich and Langmuir equations, to other soil properties. The adsorption parameters used are the Freundlich adsorption coefficient (F-a) and the Maximum Buffer Capacity (MBC). The level of free iron oxides and organic matter and the size of the silt + clay fraction were found to be significantly related to P-adsorption. Partial correlation analysis indicated that pH and silt + clay percent played the most important role in P-adsorption. The soils may be divided into two groups of P-adsorption capacity depending on the silt + clay content being lower or greater than the critical value of 45 percent. On further examination of the effect of pH it was found that the interplay of redox potential and pH, determined the formation of free iron oxide in soils
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