TY - JOUR
T1 - Maize crop residue uses and trade-offs on smallholder crop-livestock farms in Zimbabwe: Economic implications of intensification
AU - Rusinamhodzi, L.
AU - van Wijk, M.T.
AU - Corbeels, M.
AU - Rufino, M.C.
AU - Giller, K.E.
PY - 2015
Y1 - 2015
N2 - Decisions to use crop residues as soil cover for conservation agriculture create trade-offs for farmers who
own cattle in crop-livestock systems. Trade-offs among soil C, crop and animal and crop productivity
were analysed using the NUANCES-FARMSIM (FArm-scale Resource Management SIMulator) dynamic
model. Retention on the soil surface of 0, 25, 50, 75 and 100% of the maize stover yield produced per farm,
and the use of the remainder as animal feed was quantified over a 12 year period for four farm types in
Murehwa, Zimbabwe. Retaining 100% maize residues in the field led to an annual loss of on average 68
and 93 kg body weight per animal for cattle on farms of the relatively wealthiest farmers (Resource
Group, RG1) who had most land and cattle and RG2 respectively), and is therefore unsustainable for
livestock production. There was an increase in grain yield of 1.6 t farm-1 and 0.7 t farm-1 for RG1 and
RG2 respectively. Farmers without cattle (RG3 and RG4) may have a greater incentive for retaining their
crop residues but they have to invest labour to keep the residues during the dry season. However,
improved crop productivity for these farmers is limited by lack of access to fertiliser. The current practice
of allocating all crop residues to animals results in average gross margin of US$7429 and US$4037 for
RG1 and RG2 farmers respectively. Our results showed that from an economic perspective, it is logical
that farmers prioritise the sustenance of cattle with crop residues over soil fertility management. We
conclude that at current productivity levels, farmers who own cattle have limited scope to allocate crop
residues for soil cover as it leads to significant loss in animal production and economic value.
AB - Decisions to use crop residues as soil cover for conservation agriculture create trade-offs for farmers who
own cattle in crop-livestock systems. Trade-offs among soil C, crop and animal and crop productivity
were analysed using the NUANCES-FARMSIM (FArm-scale Resource Management SIMulator) dynamic
model. Retention on the soil surface of 0, 25, 50, 75 and 100% of the maize stover yield produced per farm,
and the use of the remainder as animal feed was quantified over a 12 year period for four farm types in
Murehwa, Zimbabwe. Retaining 100% maize residues in the field led to an annual loss of on average 68
and 93 kg body weight per animal for cattle on farms of the relatively wealthiest farmers (Resource
Group, RG1) who had most land and cattle and RG2 respectively), and is therefore unsustainable for
livestock production. There was an increase in grain yield of 1.6 t farm-1 and 0.7 t farm-1 for RG1 and
RG2 respectively. Farmers without cattle (RG3 and RG4) may have a greater incentive for retaining their
crop residues but they have to invest labour to keep the residues during the dry season. However,
improved crop productivity for these farmers is limited by lack of access to fertiliser. The current practice
of allocating all crop residues to animals results in average gross margin of US$7429 and US$4037 for
RG1 and RG2 farmers respectively. Our results showed that from an economic perspective, it is logical
that farmers prioritise the sustenance of cattle with crop residues over soil fertility management. We
conclude that at current productivity levels, farmers who own cattle have limited scope to allocate crop
residues for soil cover as it leads to significant loss in animal production and economic value.
KW - Conservation agriculture
KW - Feed
KW - Fertilisers
KW - Simulation modeling
KW - Soil C
U2 - 10.1016/j.agee.2015.08.012
DO - 10.1016/j.agee.2015.08.012
M3 - Article
SN - 0167-8809
VL - 214
SP - 31
EP - 45
JO - Agriculture, Ecosystems and Environment
JF - Agriculture, Ecosystems and Environment
ER -