Reference soil Uruguay 07: Planosol

UY007

Planosols occur in level landscapes throughout the world often associated with broad river valleys.

Characteristics

Soils having an eluvial horizon, the lower boundary of which is marked. within 100 cm from the soil surface, by an abrupt textural change associated with stagnic properties above that boundary. The feature of albeluvic tonguing, however, is lacking.

Distribution of Planosols (rough estimation supplied by soilgrids)

Reference soil UY007: Planosols

PERIOD: Asencio MORPHOLOGY B3 Colour also 10YR3/6 and 7.5YR5/6 in bands LITERATURE: Panario,D (1974) Contribución al estudio de caracterización y génesis de algunas "Paraderas Arenosas Hidromórficas del Litoral". Thesis de Ingeniero Agrónomo. Ministerio de ganaderia y Agricultura Direccion de Suelos Y Fertilizantes.

Classification

WRB 2006

WRB 1998

Luvic- Planosol (Eutric)

Eutri-Luvic- Planosol

55-117 cm	argic horizon
-	stagnic colour pattern
-	abrupt textural change
-	reducing conditions

0-55 cm	ochric horizon
55-117 cm	argic horizon
-	stagnic
-	abrupt textural change

FAO-UNESCO-ISRIC 1988

FAO-UNESCO-ISRIC 1974

Orthi-Eutric Planosol

Eutric Planosol

0-55 cm	ochric A horizon
55-117 cm	argic B horizon
-	abrupt textural change
-	stagnic

0-55 cm	ochric A horizon
-	abrupt textural change
-	hydromorphic

Local classification:	Pradera arenosa de máxima lixiviación

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
0-50	-	0.1	5.1	21.8	33.0	9.3	69.3	23.5	3.7	27.2	3.5
50-63	-	0.1	5.4	22.6	45.0	13.2	86.3	4.0	4.8	8.8	4.8
63-73	-	0.3	5.2	18.9	39.3	12.4	76.1	3.5	5.0	8.5	15.5
73-101	-	0.1	4.0	14.8	25.7	7.5	52.1	3.5	4.9	8.4	39.4
101-117	-	0.2	4.0	16.3	32.1	11.8	64.4	3.8	4.7	8.5	27.2
117-	-	0.2	4.1	19.3	40.4	12.9	76.9	1.8	2.7	4.5	18.6

Water retention characteristics

Depth (cm)	Bulk density kg/dm³	Spec. Surf. Area m²/g	COLE cm/cm	Water disp. clay %	Clay % w/w
0-50	-	-	-	-	3.5
50-63	-	-	-	-	4.8
63-73	-	-	-	-	15.5
73-101	-	-	-	-	39.4
101-117	-	-	-	-	27.2
117-	-	-	-	-	18.6

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
0-50	5.6	4.9	0.08	-	0.39	0.04	10	0.1	0	0.8	0.3	0.3	0.2	1.6
50-63	6.1	4.9	0.04	-	0.18	0.01	18	0	0	0.8	0.5	0.2	0.3	1.8
63-73	5.0	4.1	0.05	-	0.31	-	-	0.3	0.2	2.4	1.5	0.3	0.3	4.5
73-101	4.9	3.9	0.08	-	0.47	-	-	0.9	0.4	7.3	4.2	0.4	0.4	12.3
101-117	5.1	3.9	0.06	-	0.22	-	-	0.8	0.4	6.4	3.7	0.3	0.2	10.6
117-	5.1	4.0	0.05	-	0.15	-	-	0.5	0.2	4.5	2.6	0.2	0.4	7.7

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 %
0-50	100	1.6	46	1.4	-	0	13
50-63	106	1.7	35	0.6	-	0	18
63-73	56	8.0	52	1.1	-	3	4
73-101	51	24.3	62	1.6	-	2	2
101-117	54	19.7	72	0.8	-	2	1
117-	45	17.0	91	0.5	-	1	2

Depth (cm)	pH NaF	P Retention %	ODOE	Al o % w/w	Si o % w/w	Fe d % w/w	Al d % w/w	Fe p % w/w	Al p % w/w	C p % w/w	Fe o % w/w
0-50	-	-	-	0.00	0.00	0.10	0.00	-	-	-	0.00
50-63	-	-	-	0.00	0.00	0.20	0.00	-	-	-	0.10
63-73	-	-	-	0.10	0.00	0.40	0.00	-	-	-	0.10
73-101	-	-	-	0.20	0.00	1.30	0.10	-	-	-	0.10
101-117	-	-	-	0.10	0.00	0.50	0.10	-	-	-	0.10
117-	-	-	-	0.10	0.00	0.30	0.00	-	-	-	0.10

Clay mineralogy

Depth (cm)	Chlorite	Feldspar	Gibbsite	Goethite	Halloysite	Hematite	Kaolinite	Mica / illite	Mixed-layer	Quartz	Smec	Vermiculite
0-50	-	weak	-	-	-	-	weak	weak	weak	weak	medium to strong	-
63-73	-	weak	-	-	-	-	weak	very weak to weak	weak	weak	very strong	-
101-117	-	weak	-	-	-	-	weak to medium	very weak	weak	weak	very strong	-
117-	-	very weak	-	-	-	-	weak	-	weak	-	very strong	-

Profile description

Ah1 0-42 cm	dark grey (10YR 4/1, dry) very dark greyish brown (10YR 3/2, moist)sandy loam,slightly hard very friable non sticky non plastic,gradual boundary to,
Ah2 42-55 cm	(10YR 5.4/2, dry) (10YR 4.4/2, moist)sandy loam,slightly hard very friable non sticky non plastic,clear boundary to,
Bt1 55-76 cm	very dark grey (10YR 3/1, dry)sandy clay,firm sticky plastic,common fine distinct clear mottles (7.5YR 5/6) and few fine distinct mottles,clay cutans,gradual boundary to,
Bt2 76-100 cm	(10YR 5/1.4, dry)sandy clay loam,friable sticky plastic,many medium distinct clear mottles (7.5YR 5/6) and common medium distinct mottles (10YR 4/6),clay cutans,diffuse boundary to,
100- cm	light brownish grey (10YR 6/2, dry)sandy clay loam,frequent small ferruginous concretions frequent small manganiferous concretions,

Kind 1 (parent material) ; Parker (eds), 1984	sandstone
Mode of accumulation or deposition of parent material	residual material
Remarks on Parent Materials	Cretaceous
Texture of parent material	sandy clay
Weathering Resistance	moderate

Land use or vegetation in the immediate vicinity of the site	semi-natural grassland, grazed
Major vegetation type; Guidelines for soil description - Fourth edition (FAO, Rome, 2006)	grassland

Altitude	60m
Physiographic position of the site	middle slope
Regional landform; McDonald, R.C., Isbell, R.F. et all, 1984; Australian soil and land survey Field Handbook, Inkata Press, Melbourne.	plateau
Slope	3%
Topography; Guidelines for soil description - Fourth edition (FAO, Rome, 2006)	undulating

Drainage class ; FAO (2006) - Guidelines for soil description	well
Estimated permeability (class) of least permeable part of the profile	slow

Evidence of alkali ; Soil Survey Manual USDA, 1951	non-alkaline
Evidence of salt; Soil Survey Manual USDA, 1951	non-saline

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Reference soil Uruguay 07: Planosol

Characteristics

Reference soil UY007: Planosols

Classification