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SUNDIAL is a user-friendly PC-based version of the Rothamsted Nitrogen Turnover model (Bradbury et al., 1993). It is a dynamic model, describing the turnover of nitrogen and carbon in the soil crop system: inputs from fertilisers, organic manures, the atmosphere and crop seed; transformations by mineralisation, immobilisation, nitrification and crop uptake; and outputs by denitrification, leaching, volatilisation, senescence and harvest. A great strength of SUNDIAL is that it is based on simple equations, using only a small number of parameters, and so is robust and nonspecific in its execution. The model was originally developed for cereals under funding from the UK Home Grown Cereals Authority and so has been extensively tested for nitrogen turnover under cereal crops. It is currently being extended to include further crops and soil types with funding from the U.K. Ministry of Agriculture, Fisheries and Food. |
