Characterization of Phosphorus Sorption in Calcareous Soils from East Nusa Tenggara, East Java and West Java
ABSTRACT
TEDHI DANA PAMUJI. Characterization of Phosphorus Sorption in Calcareous Soils from East Nusa Tenggara, East Java and West Java. Supervised by ARIEF HARTONO and SYAIFUL ANWAR
Availability of phosphorus (P) in soils is affected by pH value. Calcareous soils have a neutral until alkaline pH then P sorption affected by calcium ion (Ca), magnesium ion (Mg), and CaCO3. However, in the calcareous soils the content of oxyde/hydroxide Fe and Al were identified. It can be observed from the red matrix colour of some calcareous soils. Oxide/hydroxide Fe and Al were supposed to affect P sorption characteristics. The influence of oxide/hydroxide Fe and Al on P sorption in calcareous soils need more studies. The objectives of this study were to characterize physico-chemical properties of calcareous soils and to characterize the pattern of P sorption of calcareous soils. In addition it was to evaluate correlation between physico-chemical properties of calcareous soils and P sorption parameters of Langmuir and Freundlich equation. Soil samples were collected from East Nusa Tenggara, East Java, and West Java. Psycho-chemical properties of calcareous soils varied. They were showed by standard deviation values of the data. In general the pH values was neutral, with exchangeable Ca dominated exchange site of soils, and the value of available P were very low to medium status. Langmuir and Freundlich equation simulated P sorption very well. P sorption maxima (b-Langmuir) ranged from 1.43 – 2.5 x 103 mg P kg-1 (average 1.95 x 103 mg P kg-1), while bonding energy (K-Langmuir) ranged from 0.67 – 2.35 L mg-1 (average 1.28 L mg-1). P-requirement (P sorbed at 0.2 mg L-1) ranged from 277 – 526 mg P kg-1 (average 374 mg P kg-1). P sorption capacity (K Freundlich) ranged from 0.78 – 1.28 x 103 L kg-1 (average 0.96 x 103 L kg-1), while n constant (n-Freundlich) ranged from 1.29 – 1.92 (average 1.58). P sorption maxima of Langmuir correlated with exchangeable Ca and CaCO3, while P sorption capacity of Freundlich had higher correlation with exchangeable Ca. Amount of oxide/hydroxide Fe and Al on soils correlated with bonding energies of Langmuir and n constant of Freundlich. It suggested that P soption maxima in calcareous soils were determined by exchangeable Ca and CaCO3, while bonding energies were determined by oxide/hydroxide Fe and Al.
Keyword: calsium carbonate, exchangeable calsium, Freundlich equation, oxide/hydroxide Fe and Al, Langmuir equation.
http://repository.ipb.ac.id/handle/123456789/83199
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