Asheim, L.J., Zabron, C.N., Mwaseba, D. and EIK, L.O.

Asheim, L.J., Zabron, C.N., Mwaseba, D. and EIK, L.O.

Modeling economics of carbon sequestration in Tanzanian farm production systems

SUA/Noragric/NILF

NORWEGIAN UNIVERSITY OF LIFE SCIENCES

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SYNOPSIS

Production systems in Mgeta and NjombeChallenges, problems and opportunitiesMethodProgress farm modeling (Mgeta)Further model developmentParameterizationConclusion

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egian Agricultural Economics Research Institute (N

ILF) Sokoine University of Agriculture (SU

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Vegetables in very steep slopes or terracesManual field work that can`t be mechanizedTwo season cycles are important:Rain:Sept.-May-270days & dry:Jun.-Aug.95daysCrop-livestock integrated production systemDairy goats, >1500 of Norwegian breed Pork, indigenous meat goats, and poultry

Production System in Mgeta

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Manual field work – can be mechanizedOnly one rain season (February-May)More land with opportunities for forestsCrop-livestock dominant agricultural system Dairy cows (Friesian, Ayshire, Jersey)Pork, indigenous cows, goats, and poultry

Production System in Njombe

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Challenges

Climate change, increased population, intensive production systems, reduced land use, competition for water, poverty and malnutrition!

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Environmentally disastrous production system Agricultural productivity can be increased:Dairy goats and cows can milk more Improved feedingImproved veterinary servicesGrass and multipurpose trees (MPPT) for:Increased soil carbon sequestrationManagement of erosion

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Problems and opportunities (Mgeta)

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Linear programming (LP) model to identify activities with maximum objective function, not violate constraints, no negative activity

Max Z = c’x, subject to Ax≤b, x≥0Z = objective function, farm gross marginc’ = a vector of marginal activity gross marginsx = a vector of activity levels A = a matrix of activity resource requirementsb = a vector of resources e.g land, work hBuilt in Excel, price level 2012, assumed certainty

Method

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Mgeta

Norwegian Agr. Econ. Research Instituet (NILF Sokoine University of Agriculture (SUA)


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Cropping homestead land (0.28 ha):Tomatoes, potatoes, cabbage, both seasonsN-fixing: beans, green peas, both seasonsGrass, MPPT, permanent Cropping distant farm land (0.34 ha):Beans and maize, both seasonsGrass and MPPT, permanent (haymaking)Both areas: Fruit trees in between

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Activities (Mgeta)

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Communal land: Grass and MPPT Feed purchase: Maize bran in both seasonsAnimals: Dairy goats, for milk sale or self-sufficiency Meat goats or pork for meat and manureLaying hens for self-sufficiency

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Activities cont.

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Using mineral fertilizers and manure for cropsAdding cost of land maintenance Hiring workers, dry and rain seasonConsuming vegetable, dry and rain season

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Activities cont.

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Terracing and land maintenance

Norwegian Agr. Econ. Research Instituet (NILF) Sokoine University of Agriculture (SUA)


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Categories of land according to seasonAllowable number of fruit trees/haAllowable amounts of communal land feedMineral fertilizer < purchased amountsManure use < farm produced + purchasedIntercropping: Potatoes < green peas in both seasons Maize < beans in both seasons

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Resources

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Energy in feed (MJ) < produced each seasonProtein in feed (kg AAT) < produced each seasonWork < available time + hired each seasonFamily energy need (MJ) < produced each seasonProtein need (kg) < produced each seasonVegetable consumed < produced amounts each

season

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Resources

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Options for increased soil C sequestration: Limit vegetable crops (e.g. only for family)Increase grass & MPPT (e.g. 50% of area)More purchased feed adding more manure to soilsIs less feeding of crop residues efficient for C

sequestration?

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Further model development

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Policy instruments: subsidies for feed purchase, investment support in yoghurt production payment for permanent grassland & MPPTsupport for purchase of mineral fertilizers

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Model development: cont.

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Mgeta model based on questionnaire to farmers (Cuthibert N. Zabron)

Njombe questionnaire (Nina Lande)Other areas (Haydom) and techniques (CA)

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Model parameterization

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In Mgeta we basically end up with a study of economics of a changeover from vegetable crop systems to specialized dairy goat and more permant grass systems with MPPT

Njombe has not come so far, but it will be dairy cows instead of goats and forest planting for C sequestration is an issue

Other areas (Haydom) and techniques (CA) is not decided yet

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Conclusion

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Thanks for listening

Norwegian Agr. Econ. Research Instituet (NILF Sokoine University of Agriculture (SUA)

Asheim, L.J., Zabron, C.N., Mwaseba, D. and EIK, L.O.

Documents

Transcript of Asheim, L.J., Zabron, C.N., Mwaseba, D. and EIK, L.O.