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soil evaporation

Catalogue: GRDC Publications
" Goondiwindi GRDC Grains Research Update Day 1 - Tuesday 4 th March Time Topic Speaker (s) 10:00 AM James Clark (Chair Northern Welcome Panel GRDC) 10:10 AM General plenary (Supported by North West Local Land Services) 10:10 AM 10:40 AM.. 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... Overall, populations increased five times compared to before planting the summer crops, but remained below 250/kg soil (Figure 4)...
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Catalogue: GRDC Publications
" GRDC Grains Research Update Goondiwindi, March 2014 General plenary day 2.. 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... Only some of the mutations provide resistance to both groups of herbicides...
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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: GRDC Factsheets
Key points controlling summer weeds is the most effective way to conserve soil moisture during the summer fallow period... summer grazing can damage soil in the surface layers, but does not reduce crop yields provided summer weeds are properly controlled and at least 2t/ha of cereal stubble or 70 per cent stubble cover is maintained... Only one in 13 experiments showed an improvement...
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Catalogue: GRDC Final Reports
The Southern Queensland Farming Systems (SQFS) project has demonstrated that growers and advisers had a) at least three distinct planting strategies when planting on marginal moisture and b) a low level of understanding of the potential economic and agronomic implications of these three strategies... Future projects should attempt to actively incorporate a range of private and public sector segments of the farming RD&E supply chains on their management committees and consequent portfolio of projects... Starter P rates are being reduced to optimise P use efficiency (PUE), and fluids are being evaluated as a way of further improving starter PUE...
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Catalogue: Ground Cover
Evaporation models to improve water management.. The data covered a diversity of rainfall (light to heavy), seasonal weather variation and quantities of water available to evaporate from the soil... As would be expected, all soils lose more water in the hotter months, Dr Foley says...
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Catalogue: GRDC Publications
Assuming a single soil evaporation parameter to benchmark water use efficiency is a very coarse simplification, and possibly the main source of error in estimating water use efficiency using the French and Schultz approach... Selecting a variety to match to a time of sowing so that flowering occurs during the flowering window is an important management decision to improve yield and water use efficiency... The effect of sowing rate on water use efficiency in winter cereals is strongly influenced by the amount of soil moisture leading into spring...
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