8342937106

EDGARDO A. AUX TERO,J. SHAMSHUDDIN AND S.PARAMANANTHAN

TABLE3

Taxonomic classificaiion of acid sulfate soils ai Pulau

I.uimii. Kelang

Location	Subgroup	Family	Series
Reclaimed	Typie	Fine, mixed,	Parit
Areas	Sulfaquepts	isohyperthermic	Botak
	Typie	Fine loamy.	Sedu
	Sulfaquepts	mixed, isohyperthermic
	Sulfic	Fine loamy.	Jawa
	Tropaquepts	mixcd, isohyperthermic
	Sulfic	Fine, mixed,	Tongkang
	Tropaquepts	isohyperthermic
Newly	Typie	Fine loamy.	Sedu
drained	Sulfaquepts	mixed,	silty
areas			variant
		isohyperthermic	(a and b)

most of the yellowish mottles in acid sulfate soils in Malaysia were natrojarosite. Once formed, the jarosite (pS = 98.6) isslabie (Vleketai 1974) .The depth at which jarosite appearsin the profile isan important criterion for the classificaiion of acid sulfate soils. In thejarosite layer, soil pi l isvery Iow, usually below4.0.

CONCLUSION

Acid sulfate soils in Pulau Lumut, Kelang can be classified eitherasTypicSu!faquepts (Parit Botak, Sedu and Sedu Sil ty) or Sulflc Tropaquepts (Tongkang and Jawa) basedon the depth at which the sulfurichorizonoccurs.Thesoilsaredeveloped as a result of oxidation of pyrite after the soils are drained for agricultural production. The soils are characterized by Iow pH, high Al and the presence of jarosite in voidsand/or root channels. The size of thisjarosite isabout 1 fjm. Othermineralsin the soils include kaolinite, mica and smectite, with minor amountsofgibbsite and halloysite.

ACKNOWLEDGMENTS

The authorswish to record their appreciation to Uniyersiti Pertanian Malaysia, Department of Agriculture, Peninsular Malaysia, and National Council for Research and Science Development for technical and Financial support during the conduct of the research.

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