However, mono-crop simulation varied highly from observed yields (R 2<0.3). Simulations of the intercrops correlated favourable with coefficient of determination (R 2) values of >0.4 showing a reasonable relationship between observed and simulated values. Simulations of crop rotations correlated most (R 2=0.48) with observed results at Kabete and Kiserian. The model performed better for Kabete (ME=0.6) than Kiserian (ME=0.9). current temperature combinations in accordance to the International Panel on Climate Change projections. The effect of the changes in rainfall and temperature on maize yields was considered, i.e. The experimental design was a randomized complete block (RCBD) with a split-plot arrangement where the main plots were three cropping systems monocropping, intercropping and crop rotation and the split plots were farmyard manure (FYM) and Minjingu Rock Phosphate (MRP), and a control. To obtain data for model calibration and validation, on-station (Kabete) and on-farm experiments (Kiserian) were set out during the short rain season of 2013. A simulation study was carried out using APSIM model to assess the maize yield and soil nutrients to changes in temperatures and rainfall in Kabete and Kiserian areas of central Kenya.
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