Journal article

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

D Rodriguez, J Nuttall, VO Sadras, H Van Rees, R Armstrong

Australian Journal of Agricultural Research | Published : 2006

Abstract

The APSIM-Wheat module was used to investigate our present capacity to 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 to limit grain yield. In this study we tested whether the effects of subsoil constraints on wheat growth and production could be modelled with APSIM-Wheat by assuming that either: (a) root exploration within a particular soil layer was reduced by the presence of toxic concentrations of salts, or (b) soil water uptake from a particular soil layer was reduced by high concentration of salts through osmotic effects. After evaluating the improved predic..

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