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soil hydraulic property

Catalogue: GRDC Updates
Given the importance of soil evaporation in influencing how much water will be stored during a fallow and its potential to vary with climate, soils and land management practices, it is timely (within the scope of this project) to assess the way in which we are accounting for these losses in our models.. The large difference in the number of simulations run for each model can be attributed to the physical nature of SWIM. SWIM requires a hydraulic gradient in order to move water between layers, so for soils that are at or above DUL this gradient is very low and SWIM can have difficulty finding a solution... Overall, both models are acceptable for modelling soil evaporation over a range of soils and seasons provided accurate soil physical properties and starting water states are known...
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Catalogue: Ground Cover
An understanding of how crop roots change the arrangement of pore space could help researchers measure the changes in water infiltration and availability when growing conditions change... Craig has developed simple models to explain the observed changes, culminating in a simulation model that demonstrates changes over the whole season... Craig's objectives were to: quantify the relationship between root-induced changes to soil hydraulic properties and root properties; quantify how root geometry is affected by factors such as crop and soil type; and develop a model that quantifies how roots will modify soil hydraulic properties and the impact of these changes on crop growth...
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