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Beyond resource constraints - Exploring the biophysical feasibility of options for the intensification of smallholder crop-livestock systems in Vihiga district, Kenya

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Beyond resource constraints - Exploring the biophysical feasibility of options for the intensification of smallholder crop-livestock systems in Vihiga district, Kenya. / Tittonell, P.; van Wijk, M. T.; Herrero, M. et al.
In: Agricultural Systems, Vol. 101, No. 1-2, 06.2009, p. 1-19.

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Tittonell P, van Wijk MT, Herrero M, Rufino MC, de Ridder N, Giller KE. Beyond resource constraints - Exploring the biophysical feasibility of options for the intensification of smallholder crop-livestock systems in Vihiga district, Kenya. Agricultural Systems. 2009 Jun;101(1-2):1-19. Epub 2009 Apr 16. doi: 10.1016/j.agsy.2009.02.003

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Tittonell, P. ; van Wijk, M. T. ; Herrero, M. et al. / Beyond resource constraints - Exploring the biophysical feasibility of options for the intensification of smallholder crop-livestock systems in Vihiga district, Kenya. In: Agricultural Systems. 2009 ; Vol. 101, No. 1-2. pp. 1-19.

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@article{b5a5a4b86edf47d491f952009193838c,
title = "Beyond resource constraints - Exploring the biophysical feasibility of options for the intensification of smallholder crop-livestock systems in Vihiga district, Kenya",
abstract = "During participatory prototyping activities in Vihiga, western Kenya, farmers designed what they considered to be the ideal farm [Waithaka, M.M., Thornton, P.K., Herrero, M., Shepherd, K.D., 2006. Bio-economic evaluation of farmers' perceptions of viable farms in western Kenya. Agric. Syst. 90, 243-271]: one in which high productivity is achieved through optimising crop-livestock interactions. We selected four case study crop-livestock farms of different resource endowment (Type 1-4 - excluding the poorest farmers, Type 5, who do not own livestock) and quantified all relevant physical flows through and within them. With this information we parameterised a dynamic, farm-scale simulation model to investigate (i) current differences in resource use efficiencies and degree of crop-livestock interactions across farm types; and (ii) the impact of different interventions in farm Types 3 and 4 on producing the desired shifts in productivity towards the ideal farm. Assuming no resource constraints, changes in the current farm systems were introduced stepwise, as both intensification of external input use (fertilisers and fodder) and qualitative changes in the configuration of the farms (i.e. changing land use towards fodder production, improving manure handling and/or changing cattle breeds). In 10-year simulations of the baseline, current scenario using historical weather data the wealthiest farms Type 2 achieved food self-sufficiency (FSS) in 20% of the seasons due to rainfall variability, whereas the poorer Type 4 only achieved FSS in 0 to 30% of the seasons; soil organic C decreased during the simulations at annual rates of -0.54, -0.73, -0.85 and -0.84 t C ha-1 on farms of Type 1-4, respectively; large differences in productivity and recycling efficiency between farm types indicated that there is ample room to improve the physical performance of the poorer farms (e.g. light and water use efficiency was 2-3 times larger on wealthier farms). Simulating different intensification scenarios indicated that household FSS can be achieved in all farm types through input intensification, e.g. using P fertilisers at rates as small as 15 kg farm-1 season-1 (i.e. from 7 to 28 kg ha-1). Increasing the area under Napier grass from c. 20 to 40% and reducing the area of maize, beans and sweet potato in farms of Type 3 and 4 increased their primary productivity by c. 1 t ha-1 season-1, their milk production by 156 and 45 L season-1, respectively, but decreased the production of edible energy (by 2000 and 250 MJ ha-1 season-1) and protein (by 20 and 3 kg ha-1 season-1). By bringing in a more productive cow the primary productivity increased even further in Farm Type 3 (up to 5 t ha-1 season-1), as did milk production (up to c. 1000 L season-1), edible energy (up to c. 10,000 MJ ha-1 season-1) and protein (up to c. 100 kg ha-1 season-1). The impact of livestock management on the recycling of nutrients and on the efficiency of nutrient use at farm scale can be large, provided that enough nutrients are present in or enter the system to be redistributed. An increase in N cycling efficiency through improved manure handling from 25 to 50% would increase the amount of N cycled in the case study farms of Type 1 and 2 by only ca. 10 kg season-1, and only 1-2 kg season-1 in Type 3 and 4. The various alternatives simulated when disregarding resource constraints contributed to narrow the productivity and efficiency gaps between poorer and wealthier farms. However, the feasibility of implementing such interventions on a large number of farms is questionable. Implications for system (re-)design and intensification strategies are discussed.",
keywords = "Farm-scale modelling, Farming systems design, Food security, Resource use efficiency, Smallholder farms, Sub-Saharan Africa",
author = "P. Tittonell and {van Wijk}, {M. T.} and M. Herrero and Rufino, {M. C.} and {de Ridder}, N. and Giller, {K. E.}",
year = "2009",
month = jun,
doi = "10.1016/j.agsy.2009.02.003",
language = "English",
volume = "101",
pages = "1--19",
journal = "Agricultural Systems",
issn = "0308-521X",
publisher = "ELSEVIER SCI LTD",
number = "1-2",

}

RIS

TY - JOUR

T1 - Beyond resource constraints - Exploring the biophysical feasibility of options for the intensification of smallholder crop-livestock systems in Vihiga district, Kenya

AU - Tittonell, P.

AU - van Wijk, M. T.

AU - Herrero, M.

AU - Rufino, M. C.

AU - de Ridder, N.

AU - Giller, K. E.

PY - 2009/6

Y1 - 2009/6

N2 - During participatory prototyping activities in Vihiga, western Kenya, farmers designed what they considered to be the ideal farm [Waithaka, M.M., Thornton, P.K., Herrero, M., Shepherd, K.D., 2006. Bio-economic evaluation of farmers' perceptions of viable farms in western Kenya. Agric. Syst. 90, 243-271]: one in which high productivity is achieved through optimising crop-livestock interactions. We selected four case study crop-livestock farms of different resource endowment (Type 1-4 - excluding the poorest farmers, Type 5, who do not own livestock) and quantified all relevant physical flows through and within them. With this information we parameterised a dynamic, farm-scale simulation model to investigate (i) current differences in resource use efficiencies and degree of crop-livestock interactions across farm types; and (ii) the impact of different interventions in farm Types 3 and 4 on producing the desired shifts in productivity towards the ideal farm. Assuming no resource constraints, changes in the current farm systems were introduced stepwise, as both intensification of external input use (fertilisers and fodder) and qualitative changes in the configuration of the farms (i.e. changing land use towards fodder production, improving manure handling and/or changing cattle breeds). In 10-year simulations of the baseline, current scenario using historical weather data the wealthiest farms Type 2 achieved food self-sufficiency (FSS) in 20% of the seasons due to rainfall variability, whereas the poorer Type 4 only achieved FSS in 0 to 30% of the seasons; soil organic C decreased during the simulations at annual rates of -0.54, -0.73, -0.85 and -0.84 t C ha-1 on farms of Type 1-4, respectively; large differences in productivity and recycling efficiency between farm types indicated that there is ample room to improve the physical performance of the poorer farms (e.g. light and water use efficiency was 2-3 times larger on wealthier farms). Simulating different intensification scenarios indicated that household FSS can be achieved in all farm types through input intensification, e.g. using P fertilisers at rates as small as 15 kg farm-1 season-1 (i.e. from 7 to 28 kg ha-1). Increasing the area under Napier grass from c. 20 to 40% and reducing the area of maize, beans and sweet potato in farms of Type 3 and 4 increased their primary productivity by c. 1 t ha-1 season-1, their milk production by 156 and 45 L season-1, respectively, but decreased the production of edible energy (by 2000 and 250 MJ ha-1 season-1) and protein (by 20 and 3 kg ha-1 season-1). By bringing in a more productive cow the primary productivity increased even further in Farm Type 3 (up to 5 t ha-1 season-1), as did milk production (up to c. 1000 L season-1), edible energy (up to c. 10,000 MJ ha-1 season-1) and protein (up to c. 100 kg ha-1 season-1). The impact of livestock management on the recycling of nutrients and on the efficiency of nutrient use at farm scale can be large, provided that enough nutrients are present in or enter the system to be redistributed. An increase in N cycling efficiency through improved manure handling from 25 to 50% would increase the amount of N cycled in the case study farms of Type 1 and 2 by only ca. 10 kg season-1, and only 1-2 kg season-1 in Type 3 and 4. The various alternatives simulated when disregarding resource constraints contributed to narrow the productivity and efficiency gaps between poorer and wealthier farms. However, the feasibility of implementing such interventions on a large number of farms is questionable. Implications for system (re-)design and intensification strategies are discussed.

AB - During participatory prototyping activities in Vihiga, western Kenya, farmers designed what they considered to be the ideal farm [Waithaka, M.M., Thornton, P.K., Herrero, M., Shepherd, K.D., 2006. Bio-economic evaluation of farmers' perceptions of viable farms in western Kenya. Agric. Syst. 90, 243-271]: one in which high productivity is achieved through optimising crop-livestock interactions. We selected four case study crop-livestock farms of different resource endowment (Type 1-4 - excluding the poorest farmers, Type 5, who do not own livestock) and quantified all relevant physical flows through and within them. With this information we parameterised a dynamic, farm-scale simulation model to investigate (i) current differences in resource use efficiencies and degree of crop-livestock interactions across farm types; and (ii) the impact of different interventions in farm Types 3 and 4 on producing the desired shifts in productivity towards the ideal farm. Assuming no resource constraints, changes in the current farm systems were introduced stepwise, as both intensification of external input use (fertilisers and fodder) and qualitative changes in the configuration of the farms (i.e. changing land use towards fodder production, improving manure handling and/or changing cattle breeds). In 10-year simulations of the baseline, current scenario using historical weather data the wealthiest farms Type 2 achieved food self-sufficiency (FSS) in 20% of the seasons due to rainfall variability, whereas the poorer Type 4 only achieved FSS in 0 to 30% of the seasons; soil organic C decreased during the simulations at annual rates of -0.54, -0.73, -0.85 and -0.84 t C ha-1 on farms of Type 1-4, respectively; large differences in productivity and recycling efficiency between farm types indicated that there is ample room to improve the physical performance of the poorer farms (e.g. light and water use efficiency was 2-3 times larger on wealthier farms). Simulating different intensification scenarios indicated that household FSS can be achieved in all farm types through input intensification, e.g. using P fertilisers at rates as small as 15 kg farm-1 season-1 (i.e. from 7 to 28 kg ha-1). Increasing the area under Napier grass from c. 20 to 40% and reducing the area of maize, beans and sweet potato in farms of Type 3 and 4 increased their primary productivity by c. 1 t ha-1 season-1, their milk production by 156 and 45 L season-1, respectively, but decreased the production of edible energy (by 2000 and 250 MJ ha-1 season-1) and protein (by 20 and 3 kg ha-1 season-1). By bringing in a more productive cow the primary productivity increased even further in Farm Type 3 (up to 5 t ha-1 season-1), as did milk production (up to c. 1000 L season-1), edible energy (up to c. 10,000 MJ ha-1 season-1) and protein (up to c. 100 kg ha-1 season-1). The impact of livestock management on the recycling of nutrients and on the efficiency of nutrient use at farm scale can be large, provided that enough nutrients are present in or enter the system to be redistributed. An increase in N cycling efficiency through improved manure handling from 25 to 50% would increase the amount of N cycled in the case study farms of Type 1 and 2 by only ca. 10 kg season-1, and only 1-2 kg season-1 in Type 3 and 4. The various alternatives simulated when disregarding resource constraints contributed to narrow the productivity and efficiency gaps between poorer and wealthier farms. However, the feasibility of implementing such interventions on a large number of farms is questionable. Implications for system (re-)design and intensification strategies are discussed.

KW - Farm-scale modelling

KW - Farming systems design

KW - Food security

KW - Resource use efficiency

KW - Smallholder farms

KW - Sub-Saharan Africa

U2 - 10.1016/j.agsy.2009.02.003

DO - 10.1016/j.agsy.2009.02.003

M3 - Journal article

AN - SCOPUS:67349196787

VL - 101

SP - 1

EP - 19

JO - Agricultural Systems

JF - Agricultural Systems

SN - 0308-521X

IS - 1-2

ER -