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Catalogue: GRDC Publications
It is important to remember that there are many ways in which PA can be adopted and used to make or save money, improve timeliness or environmental management and to carry out onfarm trials... If a grower purchases a GPS unit using one system and then changes to one using the other system, locations will not be translate accurately... Growers are not confident in using the currently available indices in making cropping decisions...
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Catalogue: GRDC Publications
Soil organic matter contributes to a range of biological, chemical and physical properties of soil and is essential for soil health... Soils rarely reach their theoretical potential for organic matter storage (see Figure 1.7)... In soils with low clay content the amount of humus and resistant soil organic matter is increasingly important to nutrient exchange because its large surface area gathers (adsorbs) cations from the soil solution, holding nutrients that would otherwise leach...
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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
Liebe Group project coordinator Nadine Hollamby with a soil sampler used as part of GRDC-funded fallow and stubble management research... "We knew that storing more rainfall in the soil (rather than losing it to evaporation), summer weeds or run-off could potentially increase crop yields by 0.3 to 0.5 tonnes per hectare and reduce the risks of drought," she says... But CSIRO agriculture research scientist Dr Yvette Oliver says, overall, the trials found flattening stubble made less than a five-millimetre difference in stored soil water at seeding...
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