Resource use efficiency on degraded and marginal lands
Download
1 / 8

Anton Haverkort Sjaak Conijn Wageningen University - PowerPoint PPT Presentation


  • 105 Views
  • Uploaded on

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.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Anton Haverkort Sjaak Conijn Wageningen University' - mallory-spencer


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript

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

Percentage relative yield

100

70

40

10

6.5 6.0 5.5 5.0 4.5 pH

20 30 40 50 60 % Al sat

20 10 5 3 1 ppm P Bray

30 15 8 4 2 meq/100g

01 05 10 15 20 dS/m

Mexico, sandy

Nigeria, Pfix

Brazil, acid

Pakistan, salty

6.5 6.0 5.5 5.0 4.5 pH (acidity)

20 30 40 50 60 % Al sat (acidity)

20 10 5 3 1 ppm P Bray (P-fix)

30 15 8 4 2 meq/100g (low SOM)

01 5 10 15 20 dS/m (salt)


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


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.


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


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


ad