Modelling approaches to address crop-residue tradeoffs in mixed cro...

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Modelling approaches to address crop-residue tradeoffs in mixed crop-livestock systems Mark T. van Wijk, Mariana C. Rufino...

Setup <ul><li>Intro: role of crop residues within farming system </li></ul><ul><li>Something on trade offs </li></ul><ul><...

Aim of SLP project <ul><li>Optimizing livelihood and environmental </li></ul><ul><li>benefits from crop residues in smallh...

Theory of intensification (from a NRM perspective) After: McIntyre et al. 1992, Fernández-Rivera et al. 2002

Crop residues Manure Feed Food Fertilisers Food + services Feed Market Food Livestock Grasslands Cropland Household

Crop residues have different functions <ul><li>Fodder for livestock  short term productivity livestock </li></ul><ul><l...

Trade off <ul><li>Limiting resources: changes in allocation of resources will positively affect one aspect of the system, ...

Role of simulation models <ul><li>Can help to analyse effects which are </li></ul><ul><li>difficult to measure </li></ul><...

Some analyses performed in AfricaNUANCES project <ul><li>Research project </li></ul><ul><ul><li>Typology of farming system...

NUANCES-FARMSIM FIELD: dynamic, summary model of CROP and SOIL processes LIVSIM: individual based dynamic, summary model ...

Trade off analysis N losses at farm scale [kg season -1 ] Farm scale maize yield [kg season -1 ] Tittonell, Van Wijk et al...

<ul><li>Looking for best possible trade off (pareto solutions) between indicators </li></ul><ul><li>User should then make ...

Analysis with crop residues: results of a sensitivity analysis Van Wijk et al, 2009, Agricultural Systems

Degree of crop-livestock integration Stocks, flows and assets System state II + + Management intensity + + System state I...

Models and Farm characterization

milk feed $ feed $ $ feed crop residues nutrients $ fertilisers On-farm Rented land manure Investment capacity Labour avai...

milk feed $ feed $ $ feed crop residues nutrients $ fertilisers On-farm feed crop residues nutrients $ fertilisers Where t...

milk feed $ manure feed $ feed crop residues nutrients ensiling feed $ fertilisers crop residues nutrients Rented land On-...

Differences in: Resource endowment Decision making Farm household types

Dury, Rufino, Van Wijk, De Ridder, Zingore and Giller, 2009 AEE submitted

Analysis tools Parameters Input data Biophysical world Expert knowledge Experimentation Surveys Simulation models

Analysis tools Parameters Input data Biophysical world Expert knowledge Experimentation Surveys Decision world Preferences...

Analysis tools Parameters Input data Biophysical world Expert knowledge Experimentation Surveys Decision world Preferences...

Trade offs: multiple objectives! <ul><li>Maximise gross margin </li></ul><ul><li>Maximise labour productivity </li></ul><u...

Where do models fit within SLP? <ul><li>Farm characterization: </li></ul><ul><ul><li>Available resources </li></ul></ul><...

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