Resource use efficiency on degraded and marginal lands
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Resource use efficiency on degraded and marginal lands. Third conference on sustainable agriculture Brussels May 10-12, 2010. Anton Haverkort Sjaak Conijn Wageningen University. Resource use efficiency on degraded and marginal lands.

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Anton haverkort sjaak conijn wageningen university

Resource use efficiency on degraded and marginal lands

Third conference on sustainable

agriculture

Brussels May 10-12, 2010

Anton Haverkort

Sjaak Conijn

Wageningen University


Anton haverkort sjaak conijn wageningen university

Resource use efficiency on degraded and marginal lands


Anton haverkort sjaak conijn wageningen university

Resource use efficiency on degraded and marginal lands


Anton haverkort sjaak conijn wageningen university

Resource use efficiency on degraded and marginal lands

Percentage relative yield

100

70

40

10

6.56.05.55.04.5 pH

2030405060 % Al sat

2010 5 3 1 ppm P Bray

3015 8 4 2 meq/100g

0105101520 dS/m

Mexico, sandy

Nigeria, Pfix

Brazil, acid

Pakistan, salty

6.56.05.55.04.5 pH (acidity)

2030405060 % Al sat (acidity)

2010 531 ppm P Bray (P-fix)

3015 84 2 meq/100g (low SOM)

01 5101520 dS/m (salt)


Anton haverkort sjaak conijn wageningen university

Resource use efficiency on degraded and marginal lands

Brazil, acid

Punjab, salt

Yatt 5.4 t/ha

Yact 1.6 t/ha

Yatt 12.7 t/ha

Yact 6.4 t/ha

Nigeria, Pfix

Mexico, sandy

Yatt 8.3 t/ha

Yact 5.4 t/ha

Yatt 10.9 t/ha

Yact 8.2 t/ha


Anton haverkort sjaak conijn wageningen university

Resource use efficiency on degraded and marginal lands

Degraded and marginal lands have lower resource uses

Low pH:

Low CEC:

P-fixation:

Salinity:

Up to 90 % lower use efficiency of land, water, energy, biocides, nitrate, phosphorus, potassium, lime.


Anton haverkort sjaak conijn wageningen university

Resource use efficiency on degraded and marginal lands

Indicator value

pH >6.0

Pavailable >10 ppm P

CEC >15 meq/100 g

ECe <5 dS/m

Sustainable

Sustainability

threshold

Grace period

Not yet sustainable

Unsustainability

threshold

pH < 5

Pavailable <3 ppm P

CEC < 4 meq/100 g

ECe >15

Unsustainable

1 2 3 4 5 6 7 Year


Anton haverkort sjaak conijn wageningen university

Resource use efficiency on degraded and marginal lands

Costs of remediation are enormous

Low pH: liming, soil organic matter, P application

Low CEC: organic matter amendments

P-fixation:P application, soil organic matter

Salinity:drainage, soil organic matter, P application

Best to avoid degraded soils and avoid them becoming degraded


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