A simulation model of the wheat crop in response to water and nitrogen supply: I. Model construction

Abstract

A simulation model of a fallow-wheat system is described. A total of 27 state variables are grouped in six submodels, viz. soil water, soil carbon, soil nitrogen, crop biomass, crop nitrogen and phenology. Two further submodels, environment and management, provide input data and controls for model operation. The model is an extension of a previously published model that now includes crop response to nitrogen and the alternative fallow management techniques of stubble mulching and reduced tillage. The integration interval remains at one day. The soil nitrogen submodel is primarily driven by the decomposition of organic matter between four state variables: surface crop residues, fresh organic ..