Reference soil Philippines 06: Gleysol

PH006

Gleysols occur throughout the world where groundwater comes near to the surface, causing soils to become wet for a prolonged part of the year. They are particularly abundant in the low-lying river basins.

Characteristics

Soils having gleyic properties (properties associated with prolonged wetness) within 50 cm from the soil surface. They have no diagnostic horizons other than an anthraquic, histic, mollic, ochric, takyric, or umbric horizon at the surface, or an andic, calcic, cambic, gypsic, plinthic, salic, sulfuric, or vitric horizon within 100 cm from the soil surface.

Distribution of Gleysols (rough estimation supplied by soilgrids)

Reference soil PH006: Gleysols

A fine-textured, poorly drained, irrigated dark paddy soil (chroma /1 - /2), derived from volcanic tuff, with paddy dikes and sligh cracking during dry season. (FAO: anthraquic, dystric Gleysol SOIL TAX: vertic/lithic/entic Tropaquept)

Physical characteristics

Particle size distribution

Depth (cm)	Gravel % v/v	very coarse sand % w/w	coarse sand % w/w	medium sand % w/w	fine sand % w/w	very fine sand % w/w	Total sand % w/w	coarse silt % w/w	fine silt % w/w	Total silt % w/w	Clay % w/w
0-8	-	2.8	3.4	3.7	4.5	3.4	17.8	15.9	31.2	47.1	35.1
8-24	-	2.5	4.1	1.3	2.2	2	12.1	12	27.4	39.4	48.5

Water retention characteristics

Depth (cm)	Bulk density kg/dm³	Spec. Surf. Area m²/g	COLE cm/cm	Water disp. clay %	Clay % w/w
0-8	1.053	-	-	-	35.1
8-24	1.036	-	-	-	48.5
24-38	1.16	-	-	-	-

Other physical data

Depth (cm)	Bulk density kg/dm³	pF 0 % v/v	pF 1.0 % v/v	pF 1.5 % v/v	pF 2.0 % v/v	pF 2.3 % v/v	pF 2.7 % v/v	pF 3.4 % v/v	pF 4.2 % v/v
0-8	1.053	57.7	56.7	55.7	54.5	52.6	51.2	36.2	32.1
8-24	1.036	61.2	60.2	58.4	56	54.7	53.5	53.4	48.9
24-38	1.16	55	54.1	51.9	50.2	48.9	47.8	53.9	48.5

Chemical data

Depth (cm)	pH H2O	pHKCl	EC 1: 2.5 dS/m	CaCO3 % w/w	C % w/w	N %	C / N	Exch. Acid cmol(c)/kg	Exch. Al cmol(c)/kg	Ca cmol(c)/kg	Mg cmol(c)/kg	K cmol(c)/kg	Na cmol(c)/kg	Sum Cations cmol(c)/kg
0-8	6.5	5.5	0.26	-	1.28	-	-	-	-	8.2	7.8	0.8	1.2	18
8-24	6.9	5.3	0.28	-	0.76	-	-	-	-	11.6	10.9	1.0	2.4	25.9
24-38	7.5	5.4	0.17	11	0.65	-	-	-	-	14.2	9.2	0.6	2.6	26.6
38-63	7.4	5.4	0.16	10.2	-	-	-	-	-	11.4	7.4	0.5	2.2	21.5

Depth (cm)	Base sat. %	CEC soil cmol(c)/kg	CEC clay cmol(c)/kg	CEC org cmol(c)/kg	ECEC cmol(c)/kg	Al sat. %	ESP %
0-8	41	43.9	125	4.5	-	-	-
8-24	44	59.2	122	2.7	-	-	-
24-38	50	53.6	-	2.3	-	-	-
38-63	34	64	-	-	-	-	-

Profile description

Apg1 0-8 cm	dark brown (7.5YR 3/2, moist)clay loam,fine subangular blocky,slightly hard friable slightly sticky slightly plastic,common distinct clear mottles (5 YR 4/8),many fine medium interstitial pores,very few fine gravel tuff fragments,abrupt wavy boundary to,
Apg2 8-24 cm	very dark grey (10YR 3/1, moist)clay,fine angular blocky,hard friable sticky plastic,few fine distinct clear mottles (7.5 YR 5/6),many fine medium interstitial pores,few medium thread-like ferruginous concretions,very few fine gravel tuff fragments,gradual smooth boundary to,
Cg1 24-38 cm	dark greyish brown (10YR 4/2, moist)clay,massive,friable sticky plastic,common distinct clear mottles (10 YR 6/6),many fine medium interstitial pores,cylindrical medium thread-like ferruginous concretions,gradual smooth boundary to,
Cg2 38-63 cm	dark grey (10YR 4/1, moist)sandy clay,fine and medium angular blocky,friable sticky plastic,common distinct clear mottles (10 YR 6/6) and common distinct mottles (10 YR 5/8),many fine medium pores,cylindrical large thread-like ferruginous concretions,gradual wavy boundary to,
Cg2 38-63 cm	brownish yellow (10YR 6/6, moist)

Kind 1 (parent material) ; Parker (eds), 1984	tuff
Mode of accumulation or deposition of parent material	ejecta ash
Remarks on Parent Materials	volcanic tuff

Major crops	rice
Main type of irrigation; Guidelines for soil description - Fourth edition (FAO, Rome, 2006)	paddy
Land use or vegetation in the immediate vicinity of the site	arable farming

Altitude	20m
Physiographic position of the site	flat
Regional landform; McDonald, R.C., Isbell, R.F. et all, 1984; Australian soil and land survey Field Handbook, Inkata Press, Melbourne.	plain
Slope	0%
Topography; Guidelines for soil description - Fourth edition (FAO, Rome, 2006)	flat or almost flat

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Reference soil Philippines 06: Gleysol

Characteristics

Reference soil PH006: Gleysols

Classification