Crop residue tradeoffs in crop-livestock systems: Ideas for scenarios to be analyzed
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Transcript of Crop residue tradeoffs in crop-livestock systems: Ideas for scenarios to be analyzed
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Crop residue tradeoffs in crop-livestock systems: Ideas for scenarios to be
analyzed
Presentation by Mark T. van Wijk for the SLP Crop Residues Project Review and Planning Meeting
Addis Ababa, Ethiopia, 9-10 Dec 2010
Wageningen University, Plant Production Systems
email: [email protected]
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Aim of SLP project
Optimizing livelihood and environmental
benefits from crop residues in smallholder
crop-livestock systems in sub-Saharan
Africa and South Asia: regional case studies
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Crop residues
Manure
Feed
Food
Fertilisers
Food + services
Feed
Market
Food
Livestock
Grasslands
Cropland
Household
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Crop residues have different functions
• Fodder for livestock short term productivity livestock
• Input for soil long term productivity crops
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NUANCES-FARMSIM
FIELD: dynamic, summary model of CROP and SOIL processes
LIVSIM: individual based dynamic, summary model of livestock
HEAPSIM: dynamic summary model of manure management and storage
LABOURSIM and CASHSIM: summary models of socio-economic components and their interactions with production comp.
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Aim of analyses could be
Biophysical (productivity, soil fertility) consequences of different use of crop residues along intensification pathways
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Clay
Sand
Activity A
Activity B
Input use
Pro
duct
ivity
Efficiency
Degree of crop-livestock integration
Stocks,
flows a
nd assets
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Clay
Sand
Activity A
Activity B
Input use
Pro
duct
ivity
Efficiency
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0 30 60 90 120
Activity AActivity B
Input use
Pro
duct
ivity
Efficiency
System state II
+
+
Management intensit
y
+
+System state III
System state I
Hou
seho
ld “
Wel
l-bei
ng”
Stress
Alleviation
Tittonell, Van Wijk et al, 2009, Agricultural Systems
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For different sites at different levels of crop-livestock integration:
Indicators
• soil C development
• crop productivity and its variability
• livestock productivity
Look at consequences of different use of crop residues (scenarios)
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Main interest
• Comparison of sites!!
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