@article{fdi:010040606,
  title = {{M}odelling of planted legume fallows in {W}estern {K}enya using {W}a{N}u{LCAS}. ({I}) {M}odel calibration and validation},
  author = {{W}alker, {A}. {P}. and {M}utuo, {P}. {K}. and van {N}oordwijk, {M}. and {A}lbrecht, {A}lain and {C}adisch, {G}.},
  editor = {},
  language = {{ENG}},
  abstract = {{P}oor soil fertility is the biggest obstacle to agricultural productivity in {S}ub-{S}aharan {A}frica. {I}mproved fallows can help to raise agricultural productivity in these systems of low financial capital, however, experimental testing of their potential application domain and design is costly and time consuming. {M}odels can evaluate alternative systems relatively quickly and at relatively low cost, but must first be validated to assess satisfactory simulation of the target systems. {S}pecific climatic, edaphic, crop and fallow growth data was used from five sites in {W}estern {K}enya to calibrate and validate simulations of maize and improved fallow growth using the {W}ater, {N}utrient and {L}ight {C}apture in {A}groforestry {S}ystems ({W}a{N}u{LCAS}) model. {T}he model predicted continuous maize yields across the sites with an {R}-2 supercript stop of 0.72, an {EF} (model efficiency) of 0.66 and a {CD} (coefficient of determination) of 2.73, although the default pedotransfer functions ({PTF}) for volumetric soil water content used in the model had to be substituted for a tropical soils specific {PTF} before this was achieved. {P}redicted maize yield was consistently related to fallow biomass (i.e. higher fallow biomass correlated with higher subsequent maize yields) at two sites and the model predicted maize yields following fallow growth from this subset of the data with an {R}-2 supercript stop of 0.42. {T}his relationship of fallow biomass to subsequent maize yield was not observed across the whole data set due to incomplete fallow litterfall data, factors not included in the model and associated poor model prediction of recycled tree biomass. {A}fter site and tree calibration, the model can thus be applied to assess fallow management strategies for sites limited by water and nitrogen.},
  keywords = {maize ; organic matter modelling ; pedotransfer functions},
  booktitle = {},
  journal = {{A}groforestry {S}ystems},
  volume = {70},
  numero = {3},
  pages = {197--209},
  ISSN = {0167-4366},
  year = {2007},
  DOI = {10.1007/s10457-007-9049-6},
  URL = {https://www.documentation.ird.fr/hor/fdi:010040606},
}