Impact of subsoil constraints on wheat yield and gross margin on fine-textured soils of the southern Victorian Mallee

摘要: The APSIM-Wheat module was used to investigate our present capacity simulate wheat yields in a semi-arid region of eastern Australia (the Victorian Mallee), where hostile subsoils associated with salinity, sodicity, and boron toxicity are known limit grain yield. In this study we tested whether the effects subsoil constraints on growth production could be modelled by assuming that either: (a) root exploration within particular soil layer reduced presence toxic concentrations salts, or (b) water uptake from high concentration salts through osmotic effects. After evaluating improved predictive model applied it interactions between seasonal conditions, estimate economic effect have farming Mallee under different climatic scenarios. Although soils had levels boron, observed variability abundance at layers mainly related salinity. We concluded that: (i) limitations yield is driven toxic, osmotic, both acting simultaneously still requires further research, (ii) present, performance can either increased values lower for extraction, modifying pattern profile, as function gross margin expected higher during drier than wetter seasons. interaction climate properties makes rainfall information alone, little use risk management farm planning when not integrated cropping systems models.