Reference soil Brazil 29: Planosol

BR029

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 BR029: Planosols

Classification

WRB 2006

WRB 1998

Umbric-Acric-Endogleyic- Planosol (Albic Ruptic Alumic)

Umbri-Gleyic- Planosol (Albic Alumic)

0-35 cm	umbric horizon
35-65 cm	albic horizon
65-143 cm	argic horizon
-	gleyic colour pattern
-	lithological discontinuity
-	abrupt textural change

0-35 cm	umbric horizon
35-65 cm	albic horizon
65-143 cm	argic horizon
-	gleyic
-	abrupt textural change

FAO-UNESCO-ISRIC 1988

FAO-UNESCO-ISRIC 1974

Albi-Umbric Planosol

Humic Planosol

0-35 cm	umbric A horizon
35-65 cm	albic E horizon
65-143 cm	argic B horizon
-	abrupt textural change
-	stagnic

0-35 cm	umbric A horizon
35-65 cm	albic E horizon
65-143 cm	argillic B horizon
-	abrupt textural change
-	hydromorphic

Local classification:	Planossolo Tb álico a moderado textura média/argilosa fase floresta tropical subcaducifólia relvo plano

Other classification

USDA-NRCS (1999)	Typic Albaquult aquic sandy over clayey mixed isohyperthermic
USDA-SCS (1975)	Typic Albaquult aquic sandy over clayey mixed isohyperthermic

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
0-10	-	13.1	37.3	23.3	10.2	3.4	87.3	3.3	5.6	8.9	3.9
10-35	-	17.1	27.3	17.3	13.3	5.4	80.4	6.1	8.2	14.3	5.2
35-65	-	9.9	26.3	21.9	13.7	5.7	77.5	6.2	8.8	15.0	7.6
65-88	-	9.2	14.7	10.4	7.9	3.8	46.0	4.3	6.4	10.7	43.3
88-118	-	7.1	8.8	5.4	5.0	3.3	29.6	5.6	3.8	9.4	61.0
118-143	-	7.5	11.5	7.2	6.2	3.8	36.2	5.2	6.4	11.6	52.1
143-163	-	12.1	18.3	12.8	7.1	3.1	53.4	3.5	4.7	8.2	38.4

Water retention characteristics

Depth (cm)	Bulk density kg/dm³	Spec. Surf. Area m²/g	COLE cm/cm	Water disp. clay %	Clay % w/w
0-10	-	-	-	2.2	3.9
10-35	1.585	-	-	3.2	5.2
35-65	1.689	-	-	7.3	7.6
65-88	1.680	-	-	29.3	43.3
88-118	1.509	-	-	0.9	61.0
118-143	1.605	-	-	0.5	52.1
143-163	-	-	-	0.3	38.4

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
10-35	1.585	36.4	30.1	22.9	15.8	13.7	11.0	5.4	4.8
35-65	1.689	31.4	27.9	19.3	12.5	10.7	8.6	6.2	5.9
65-88	1.680	37.6	39.8	35.0	32.5	31.6	29.8	27.9	27.2
88-118	1.509	44.5	42.7	42.5	41.2	40.7	39.8	35.8	34.5
118-143	1.605	40.1	39.8	38.0	36.3	35.6	34.3	38.2	31.9

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
0-10	4.7	4.1	0.18	-	0.54	0.05	11	1.2	0.2	0.6	0.3	0.1	0.2	1.2
10-35	4.9	4.1	0.05	-	0.29	-	-	0.4	0.5	0.0	0.0	0.0	0.1	0.1
35-65	4.9	4.1	0.03	-	0.07	-	-	0.4	0.5	0.2	0.0	0.0	0.2	0.4
65-88	4.8	3.6	0.04	-	0.16	-	-	3.4	3.6	0.8	0.9	0.0	0.1	1.8
88-118	4.5	3.5	0.04	-	0.12	-	-	6.2	6.2	0.6	0.9	0.1	0.2	1.8
118-143	4.5	3.5	0.04	-	0.07	-	-	6.8	7.1	0.2	0.7	0.1	0.0	1.0
143-163	4.4	3.6	0.04	-	0.06	-	-	5.7	5.7	0.2	0.5	0.1	0.0	0.8

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 %
0-10	63	1.9	49	1.9	-	11	11
10-35	20	0.5	10	1.0	-	100	20
35-65	44	0.9	12	0.2	-	56	22
65-88	38	4.8	11	0.6	-	75	2
88-118	20	9.1	15	0.4	-	68	2
118-143	13	7.9	15	0.2	-	90	0
143-163	15	5.3	14	0.2	-	108	0

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
0-10	-	-	-	0.00	0.00	0.10	0.00	-	-	-	0.00
10-35	-	-	-	0.00	0.00	0.10	0.00	-	-	-	0.00
35-65	-	-	-	0.00	0.00	0.00	0.00	-	-	-	0.00
65-88	-	-	-	0.10	0.00	1.00	0.10	-	-	-	0.10
88-118	-	-	-	0.10	0.00	1.60	0.20	-	-	-	0.10
118-143	-	-	-	0.10	0.00	1.50	0.10	-	-	-	0.10
143-163	-	-	-	0.10	0.00	0.70	0.10	-	-	-	0.00

Clay mineralogy

Depth (cm)	Chlorite	Feldspar	Gibbsite	Goethite	Halloysite	Hematite	Kaolinite	Mica / illite	Mixed-layer	Quartz	Smec	Vermiculite
0-10	-	-	-	-	-	-	medium to strong	weak	-	medium to strong	-	-
10-35	-	-	-	-	-	-	medium to strong	weak	-	medium to strong	-	-
35-65	-	-	-	-	-	-	strong	weak	-	medium to strong	-	-
65-88	-	-	-	-	-	-	very strong	weak	-	very weak	weak	-
88-118	-	-	-	-	-	-	very strong	weak	-	very weak	weak	-
118-143	-	-	-	-	-	-	very strong	weak	-	very weak	-	-
143-163	-	-	-	-	-	-	very strong	weak	-	-	-	-

Profile description

Ap1 0-10 cm	(10YR 5.5/1, dry) (10YR 3/1.5, moist)loamy sand,moderate very fine and fine granular and single grain,soft friable non sticky non plastic,many very fine medium pores,gradual smooth boundary to,
Ap2 10-35 cm	very dark greyish brown (10YR 3/2, moist)sandy loam,weak very fine and fine granular and single grain,soft friable non sticky non plastic,many very fine medium pores,clear smooth boundary to,
Eg 35-65 cm	dark grey (10YR 4/1, moist)sandy loam,massive,slightly hard friable non sticky non plastic,common fine medium pores,abrupt smooth boundary to,
2Btg1 65-88 cm	grey (10YR 5/1, moist)clay,weak fine and medium angular and subangular blocky and weak coarse angular and subangular blocky,very hard firm sticky plastic,common medium distinct mottles (10YR 5/5) and common medium prominent mottles (2.5YR 3/6),few pores,gradual smooth boundary to,
2Btg2 88-118 cm	grey (5Y 5/1, moist)clay,moderate medium and coarse angular and subangular blocky,extremely hard firm sticky plastic,common medium prominent mottles (10YR 4/6) and common medium prominent mottles (10YR 5/6),few pores,gradual smooth boundary to,
2Btg3 118-143 cm	grey (5Y 5/1, moist)clay,moderate medium and coarse angular and subangular blocky,extremely hard firm sticky plastic,common coarse prominent mottles (10R 3/3) and common coarse prominent mottles (10YR 4/6),few pores,gradual smooth boundary to,
2BCg 143-163 cm	grey (5Y 5/1, moist)clay,weak medium and coarse angular and subangular blocky,extremely hard firm sticky slightly plastic,common medium prominent mottles (10R 3/3) and common medium prominent mottles (2.5Y 6/7),few pores,

Kind 1 (parent material) ; Parker (eds), 1984	sediment, unconsolidated
Kind 2 (parent material) (second entry); Parker (eds), 1984	mixed lithology and composition
Mode of accumulation or deposition of parent material	fluvial
Mode of accumulation or deposition of parent material (second entry)	fluvial
Remarks on Parent Materials	Holocene sediments
Texture of parent material	sandy
Texture of parent material (second entry)	clayey
Weathering Resistance	moderate
Weathering Resistance (second entry)	moderate
General characterization of the status of weathering of solid rock	partially or moderately
General characterization of the status of weathering of solid rock (second entry)	partially or moderately

Land improvements ; Guidelines for soil description - Fourth edition (FAO, Rome, 2006)	land clearing
Land use or vegetation in the immediate vicinity of the site	cultivated pasture
Remarks on Land Use / Vegetation	LANDUSE: Cleared for pasture
Major vegetation type; Guidelines for soil description - Fourth edition (FAO, Rome, 2006)	semi-deciduous forest

Altitude	20m
Physiographic Unit	trench
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%
Form of the slope surrounding the site	straight
Topography; Guidelines for soil description - Fourth edition (FAO, Rome, 2006)	undulating

Drainage class ; FAO (2006) - Guidelines for soil description	imperfect
Dry From - To	0-10cm
Moist From - To	10-163cm
Estimated permeability (class) of least permeable part of the profile	slow
Estimated run off (class)	very slow

Evidence of alkali ; Soil Survey Manual USDA, 1951	non-alkaline
Rock outcrop class (FAO (2006) - Guidelines for soil description)	none
Evidence of salt; Soil Survey Manual USDA, 1951	non-saline
Surface stoniness class (FAO (2006) - Guidelines for soil description)	none

You are here

Reference soil Brazil 29: Planosol

Characteristics

Reference soil BR029: Planosols

Classification