Phosphate adsorption-desorption characteristics of selected soils under oil palm cultivation in Sabah

Zulkifli bin Usof, . and Marcus Jopony, . (1998) Phosphate adsorption-desorption characteristics of selected soils under oil palm cultivation in Sabah. [Proceedings Paper]

Phosphate adsorption-desorption characteristics of seven selected soils under oil palm cultivation in Sabah were investigated. The initial P concentrations used in this study were in the rance 5 - 40 mug/mL. Adsorption resulted in equilibrium P concentration in the range of 0.018 to 16.64 mug/mL depending on the soil type as well as initial P concentration. Due the relatively high adsorption capacity of the soils percent desorption is significantly small indicating that the added P is irreversibly adsorbed. The soil capacity to adsorbed P can be ranked by the following order : Katai more than Malabau more than Table more than Paliu more than Apas more than Tanjung Lipat more than Lumisir while their desorption capacity were in the following the order: Apas more than Lumisir more than Tg. Lipat more than Paliu more than Table more than Malabau more than Katai. Percentage adsorbed decreased with increasing rates of added P while desorption percentage increased with the higher rates of added P. Phosphate sorption isotherms established from this study shows that there is big variations in initial phosphate required to establish the optimum 0.2 ug mL P estimate in soil solution. P adsorbed at equilibrium of 0.2 mug mL P solution concentration ranged from 215 mug g Katai to as low as 20 mug g Lumisir. Katai soil sorbed ten times more than Lumisir to establish optimum P in the soil solution. This has important implication to P fertilizer recommendation for optimum oil palm requirement.

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Abstract

Phosphate adsorption-desorption characteristics of seven selected soils under oil palm cultivation in Sabah were investigated. The initial P concentrations used in this study were in the rance 5 - 40 mug/mL. Adsorption resulted in equilibrium P concentration in the range of 0.018 to 16.64 mug/mL depending on the soil type as well as initial P concentration. Due the relatively high adsorption capacity of the soils percent desorption is significantly small indicating that the added P is irreversibly adsorbed. The soil capacity to adsorbed P can be ranked by the following order : Katai more than Malabau more than Table more than Paliu more than Apas more than Tanjung Lipat more than Lumisir while their desorption capacity were in the following the order: Apas more than Lumisir more than Tg. Lipat more than Paliu more than Table more than Malabau more than Katai. Percentage adsorbed decreased with increasing rates of added P while desorption percentage increased with the higher rates of added P. Phosphate sorption isotherms established from this study shows that there is big variations in initial phosphate required to establish the optimum 0.2 ug mL P estimate in soil solution. P adsorbed at equilibrium of 0.2 mug mL P solution concentration ranged from 215 mug g Katai to as low as 20 mug g Lumisir. Katai soil sorbed ten times more than Lumisir to establish optimum P in the soil solution. This has important implication to P fertilizer recommendation for optimum oil palm requirement.

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Item Type:	Proceedings Paper
AGROVOC Term:	SOIL TYPES
AGROVOC Term:	PHOSPHATE FERTILIZERS
AGROVOC Term:	ADSORPTION
AGROVOC Term:	DESORPTION
AGROVOC Term:	SOIL SORPTION
AGROVOC Term:	OIL PALMS
AGROVOC Term:	TOP SOIL
AGROVOC Term:	SAMPLING
AGROVOC Term:	SOIL DEFICIENCIES
AGROVOC Term:	SABAH
Geographical Term:	MALAYSIA
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:27
URI:	http://webagris.upm.edu.my/id/eprint/16327

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