57
Fig. 5.3 Sensitivity of groundnut grain and stover to temperature, CO 2 and rainfall change on different soil types, in Nkayi Zimbabwe. APSIM_1, APSIM_2 and APSIM_3 show simulations by
the APSIM model for the three soil types: 1 = poor; 2 = average; 3 = better. The same applies for
the DSSAT model
increase up to the highest CO 2 level evaluated here. The APSIM model simulated
higher increases on the better soils while the DSSAT model simulated similarly
large increases on the average soil.
In response to temperature changes, both models show negative effects of
increased temperature and positive effects of decreased temperatures. Higher yield
reductions were simulated for better soils than for the other two soils types. Both
models show high yield reductions with temperature increases of about 2 °C, however at higher temperature increases, for example at +6 °C, the DSSAT model simulates slight stover yield increases across all soil types.
5 Understanding the Role of Soils and Management on Crops in the Face of Climate…