africa soil information for taking agronomy to scale gyga workshop 13... · 2020. 2. 27. · africa...

Africa Soil Information

for taking agronomy to scale results

Johan Leenaars (September 23rd, 2015)

ISRIC brief

(e.g. AfSIS)

(e.g. GYGA)

Need for Complete, coherent, detailed, properties, uncertainty

--

--

--

--

--

--

0 - 5 cm

5 – 15 cm

15 – 30 cm

30 – 60 cm

60-100 cm

100-200 cm


Africa Soil Information From points to grids

World Soil Profiles

Soil profile data

Derived response maps

Soil collections

Soil information

(maps)

Use soil information

Soil data processing Global Soil Information Facilities +

World Soil Profiles

Soil profile data


Soil collections

Soil information

(maps)


Validate & update

(new soil data)

Soil data processing Global Soil Information Facilities +

Africa Soil Profiles database

2770


7300


www.isric.org/data/africa-soil-profiles-database-version-01-0

AfSP version 1.0

12500

H a H b B a B c B d


AfSP version 1.0

1km

ISRIC, 2013

Africa (AfSIS)

Soil organic carbon

www.isric.org/data/soil-property-maps-africa-1-km


Uncertainty

Africa (AfSIS)

Soil organic carbon

ISRIC, 2013

1km


Africa (AfSIS)

Soil organic carbon

ISRIC, 2013

1km


Sand

Silt

Clay

OC

BD

CEC

pH H2O

Africa (AfSIS)

Soil water retention

Wösten et al., 2013

PTF

Sand

Silt

Clay

OC

BD

CEC

pH H2O

Africa Soil Information AfSP

World SoilGrids1 km

pH

Hengl et al., 2014

Africa Soil Information Upscaling

www.soilgrids.isric.org

Globally integrated

Sand

Silt

Clay

OC

BD

CEC

pH H2O

Globally integrated

Africa Soil Information updating

AfSoilGrids250m

Hengl et al., 2015

AfSP version 1.2

www.isric.org/data/africa-soil-profiles-database-version-01-2

18500 0 - 5 cm

5 – 15 cm

15 – 30 cm

30 – 60 cm

60-100 cm

100-200 cm

--

--

--

--

--

--

__

updating


--

--

--

--

--

--

__

9600

Sentinel sites soil data

updating


ISRIC, 2013

AfSoilGrids1km

Soil organic carbon

AfSoilGrids250m

Soil organic carbon

Hengl et al., 2015

updating


www.isric.org/content/african-soilgrids-250m-geotiffs


Globally integrated

Soil property Unit Sample

size RMSE

% variance

explained

Coarse fragments v% 39,206 18.4 20.3

Sand w% 55,578 15.9 61.1

Silt w% 54,164 8.3 56.1

Clay w% 54,167 13.7 52.4

Bulk density t m-3 8732 0.14 70.4

pH (H2O) - 68,458 0.67 66.9

Exch. Calcium cmol+/kg 65,158 12.7 67.2

Exch. Magnesium cmol+/kg 63,261 2.5 60

Exch. Sodium cmol+/kg 42,986 3.6 46.7

Exch. Potassium cmol+/kg 64,518 0.6 58.6

Exch. Acidity cmol+/kg 24,242 1.3 77.3

CEC cmol+/kg 47,875 7.9 66.3

Organic carbon g kg-1 64,010 10.6 61.3

Total nitrogen g kg-1 50,997 0.69 61

Extr. Aluminium mg kg-1 18,055 160 86.3

AfSoilGrids250m

Hengl et al., 2015


updating

AfSIS services and products

Total Available Water Capacity =

- Volumetric soil water retention

- pF-curve fine earth (AWC)

- Soil volume

- Gravel

- Rootable soil depth


http://www.unl.edu/

Total Available Water Capacity =

- Volumetric soil water retention

- pF-curve fine earth (AWC)

- Soil volume

- Gravel

- Rootable soil depth

Response increases with

- Increasing soil TAWC

- Increasing soil fertility

JGB Leenaars

Saria

Relevance of soil data

After Pichot et al.

Fertilised (mineral)

Year

Fertilised (org & min)

Saria

Relevance of soil data G

rain

yie

ld (

kg

/ha

)

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0 1 2 3 4 5 6

Wate

r c

on

ten

t (m

3 /

m3

)

Water potential (pF)

AfSP average clayey

AfSP average loamy

AfSP average sandy

AfSP stdev clayey

AfSP stdev loamy

AfSP stdev sandy

Africa

Soil water retention

n = 14,500

n = 13,500

n = 15,500

Africa Soil Information AfSP

2015

FC PWP

Africa Soil Grids for GYGA Soil Water Content (v%) at PWP (pF4.2)

fine earth

at 30-60 cm

Africa Soil Grids for GYGA

fine earth

at 30-60 cm

Available Soil Water Capacity (v%)


whole earth

at 30-60 cm

Coarse fragments content

Rootable soil depth: rules and thresholds


Shallowest depth of:

• Maximum rooting depth of maize

• Depth of soil

• Depth of aerated soil

• Depth to a layer with root restricting soil factor



Shallowest depth of:

• Maximum rooting depth of maize (150 cm)

• Depth of soil (depth to bedrock or iron pan)

• Depth of aerated soil (as determined by drainage class





• Volume of soil (coarse fragments)

• Porosity (bulk density)

• Porosity (TetaSat)

• Texture

• Abrupt textural change

• Acidity (pH-H2O)

• Alkalinity (pH-H2O)

• Salinity (EC)

• Sodicity (Exch Na)

• Toxicity (Exch Al)

Level Soil quality Soil property Unit 100 100 - 0 0 Trend a b X Y Threshold

score Threshold

value

Voxels Foothold CfPC v% 0 80 - 90 100 -1 -10 900 5.00 100 1 20 > 88

Voxels Porosity TetaS (PTF-Wosten) v% 100 40 - 30 1 10 -300 5.00 0 0 20 < 32

Voxels Porosity BlkDens – (1.6-(0.0035*Clay)) kg/dm3 < 0 0 - 0.35 > 0.35 -1 -286 100 3.49 0 0 20 > 0.28

Voxels Texture Sand w% 0 95 - 100 -1 -20 2000 5.00 100 1 20 > 99

Voxels Texture change Clay n - clay n-1 w% 0 40 - 60 100 -1 -5 300 -25.00 100 1 20 > 56

Voxels Texture change Sand n - sand n-1 w% 0 40 - 60 100 -1 -5 300 -25.00 100 1 20 > 56

Voxels Acidity pHH2O low - 12 5.5 - 3.6 1 1 53 -193 5.00 73 1 20 < 4

Voxels Alkalinity pHH2O high - 1 7.8 - 9.1 12 -1 -80 724 5.00 100 1 20 > 8.8

Voxels Salinity EC dS/m 0 1.5 - 6.7 > 6.7 -1 -19 129 5.00 33 1 20 > 5.7

Voxels Sodicity ExNa*100/CECsoil % 0 10 - 25 100 -1 -7 167 25.00 0 0 20 > 22

Voxels Sodicity ExNa cmolc/kg 0 1 - 5 > 5 -1 -25 125 5.00 0 0 20 > 4.2

Voxels Toxicity ExAcid*100/eCEC % 0 35 - 85 100 -1 -2 170 20.00 100 1 20 > 75

Voxels Toxicity ExAcid cmolc/kg 0 2.5 - 6.5 > 6.5 -1 -25 163 5.00 38 1 20 > 5.7

Voxels Assess most limiting score (%) LRI, plus associated factor LRF

Level Soil quality Soil property Unit

Pixels LRD Assessed from LRI cm

Pixels Foothold Rock Depth cm

Pixels Aeration Drain (classes) cm

Pixels Max (maize) 150 cm

Pixels Assess shallowest depth (cm) = ERZD, plus associated factor



Level Soil quality Soil property Unit 100 100 - 0 0 Trend a b X Y Threshold

score Threshold

value

Voxels Foothold CfPC v% 0 80 - 90 100 -1 -10 900 5.00 100 1 20 > 88

Voxels Porosity TetaS (PTF) v% 100 40 - 30 1 10 -300 5.00 0 0 20 < 32

Voxels Porosity f.BlkDens kg/dm3 < 0 0 - 0.35 > 0.35 -1 -286 100 3.49 0 0 20 > 0.28

Voxels Texture Sand w% 0 95 - 100 -1 -20 2000 5.00 100 1 20 > 99

Voxels Texture change Clay n - clay n-1 w% 0 40 - 60 100 -1 -5 300 -25.00 100 1 20 > 56

Voxels Texture change Sand n - sand n-1 w% 0 40 - 60 100 -1 -5 300 -25.00 100 1 20 > 56

Voxels Acidity pHH2O low - 12 5.5 - 3.6 1 1 53 -193 5.00 73 1 20 < 4

Voxels Alkalinity pHH2O high - 1 7.8 - 9.1 12 -1 -80 724 5.00 100 1 20 > 8.8

Voxels Salinity EC dS/m 0 1.5 - 6.7 > 6.7 -1 -19 129 5.00 33 1 20 > 5.7

Voxels Sodicity ExNa*100/CECsoil % 0 10 - 25 100 -1 -7 167 25.00 0 0 20 > 22

Voxels Sodicity ExNa cmolc/kg 0 1 - 5 > 5 -1 -25 125 5.00 0 0 20 > 4.2

Voxels Toxicity ExAcid*100/eCEC % 0 35 - 85 100 -1 -2 170 20.00 100 1 20 > 75

Voxels Toxicity ExAcid cmolc/kg 0 2.5 - 6.5 > 6.5 -1 -25 163 5.00 38 1 20 > 5.7

Voxels Assess most limiting score (%) LRI, plus associated factor LRF

Level Soil quality Soil property Unit

Pixels LRD Assessed from LRI cm

Pixels Foothold Rock Depth cm

Pixels Aeration Drain (classes) cm

Pixels Max (maize) 150 cm

Pixels Assess shallowest depth (cm) = ERZD, plus associated factor



Maize

Africa Soil Grids for GYGA Most limiting factor to rootability

whole soil

Rootable soil depth (cm)

Maize


RZD

www.isric.org/content/afsis-gyga-functional-soil-property-maps-ERZD-AWC

Total AWC (mm) of the rootable whole soil, 1st draft


Maize TAWC



Soil factor Soil variable RZPAWHC 0-25

RZPAWHC 25-50

RZPAWHC 50-75

RZPAWHC75-100

RZPAWHC 100-125

RZPAWHC 125-150

RZPAWHC 150-200

RZPAWHC 200-250

RZPAWHC 0-250 mm

RZPAWHC mean

RZPAWHC sd

km² km² km² km² km² km² km² km² km² mm mm

Foothold (soil volume) CfPc 0 0 0 0 0 0 0 0 0 - -

Porosity TetaS 46 0 2 0 0 0 0 0 48 6 12

Porosity f.BD 50202 67793 5647 65 0 0 0 0 123707 26 14

Texture adequacy Sand 1 7 7 0 36 84 7 0 142 121 28

Texture adequacy f.Clay 0 0 0 0 0 0 0 0 0 - -

Texture adequacy f.Sand 0 0 0 0 0 0 0 0 0 - -

Induration (cement.) CaCO3 - - - - - - - - - - -

Induration (cement.) CaSO4 - - - - - - - - - - -

Acidity pH-H2O 0 0 0 0 0 0 0 0 0 - -

Alkalinity pH-H2O 14421 2211 517 367 16 1 0 0 17533 15 18

Salinity EC 0 0 0 0 0 0 0 0 0 - -

Sodicity f.ExNa - - - - - - - - - 4 -

Sodicity ExNa 1460839 432776 67378 21724 3139 338 12 0 1986206 14 18

Toxicity f.ExAcid 308725 74051 7910 753 686 163 0 0 392288 21 11

Toxicity ExAcid 86398 435 658 195 45 1 0 0 87732 1 8

Depth of aerated soil f.Drain 885805 1519707 2260051 1979793 703312 3649 0 0 7352317 62 30

Depth of soil RockDpth 272300 847696 1123400 1748921 1060073 184827 4920 1 5242138 77 30

Maize max root depth 150 cm 2 19 101990 1124417 2343463 1553847 45378 2 5169118 113 18

Total (km²) 3078739 2944695 3567560 4876235 4110770 1742910 50317 3 20371229 73 39

www.isric.org/content/afsis-gyga-functional-soil-information-sub-saharan-africa-RZ-PAWHC-SSA



Soil factor Soil variable RZPAWHC 0-25

RZPAWHC 25-50

RZPAWHC 50-75

RZPAWHC75-100

RZPAWHC 100-125

RZPAWHC 125-150

RZPAWHC 150-200

RZPAWHC 200-250

RZPAWHC 0-250 mm

RZPAWHC mean

RZPAWHC sd

km² km² km² km² km² km² km² km² km² mm mm

Foothold (soil volume) CfPc 0 0 0 0 0 0 0 0 0 - -

Porosity TetaS 46 0 2 0 0 0 0 0 48 6 12

Porosity f.BD 50202 67793 5647 65 0 0 0 0 123707 26 14

Texture adequacy Sand 1 7 7 0 36 84 7 0 142 121 28

Texture adequacy f.Clay 0 0 0 0 0 0 0 0 0 - -

Texture adequacy f.Sand 0 0 0 0 0 0 0 0 0 - -

Induration (cement.) CaCO3 - - - - - - - - - - -

Induration (cement.) CaSO4 - - - - - - - - - - -

Acidity pH-H2O 0 0 0 0 0 0 0 0 0 - -

Alkalinity pH-H2O 14421 2211 517 367 16 1 0 0 17533 15 18

Salinity EC 0 0 0 0 0 0 0 0 0 - -

Sodicity f.ExNa - - - - - - - - - 4 -

Sodicity ExNa 1460839 432776 67378 21724 3139 338 12 0 1986206 14 18

Toxicity f.ExAcid 308725 74051 7910 753 686 163 0 0 392288 21 11

Toxicity ExAcid 86398 435 658 195 45 1 0 0 87732 1 8

Depth of aerated soil f.Drain 885805 1519707 2260051 1979793 703312 3649 0 0 7352317 62 30

Depth of soil RockDpth 272300 847696 1123400 1748921 1060073 184827 4920 1 5242138 77 30

Maize max root depth 150 cm 2 19 101990 1124417 2343463 1553847 45378 2 5169118 113 18

Total (km²) 3078739 2944695 3567560 4876235 4110770 1742910 50317 3 20371229 73 39


http://wms4.isric.org/geoserver/afsis_gyga/ows


World Soil Profiles


Taking Agronomy to Scale



Validate & update

africa soil information for taking agronomy to scale gyga workshop 13... · 2020. 2. 27. · africa...

Documents