The Relationship between Phosphate Adsorption and Soil Organic Carbon from Organic Matter Addition
2010
Yusran, Fadly Hairannoor
The Relationship between Phosphate Adsorption and Soil Organic Carbon from Organic Matter Addition(FH Yusran): The application of organic matter (OM) can increase soil phosphorus (P) availability via soilmineralisation. In lateritic soils, however, soluble organic carbon (OC) from OM may also reduce phosphate adsorptioncapacity, a process that also releases P in soil solution. In these soils, competitive adsorption could be dominantcompared to mineralisation. The main objectives of this study were to study phosphate adsorption in three lateriticsoils which have been treated with different types and amounts of organic amendment, and had intrinsic OC removedby combustion. The adsorption isotherms showed that OM addition could reduce phosphate adsorption and that thisreduction could last up to nine months after application. Lucerne hay was more effective than peat and wheat strawadditions in reducing phosphate adsorption capacity. The bicarbonate phosphorus (BP) release through mineralisationoccurred despite the increase of phosphate adsorption capacity due to the combustion of soil samples. Peat treatmentwas predicted to be more effective in creating organo-metal complexes with Al and Fe. Overall, mineralisation fromadded organic amendment was effective in minimising P adsorption in lateritic soil.
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