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water holding capacity

Catalogue: Ground Cover
Moisture probe lifts crop management to a new level.. Callum March has installed a moisture probe below the sowing zone to a depth of 90 centimetres on his Balaklava, SA, farm... "We are confident the use of soil moisture probes and modelling can improve decisions around crop management and marketing to challenge these benchmarks in the future," Mr Craddock says...
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Catalogue: Ground Cover
Manage Mallee seeps at the source for best results.. "Initial soil and drilling investigations in the sub-catchments assessed to date have shown that the main cause of seep formation is excess water draining through sandy dune soils, which is then held-up when it reaches the low-permeability layer known as Blanchetown clay," Mr Hall says... "To use more rainfall at the source, growers can work on improving crop agronomy, such as better management of water-repellent soils and soil nutrition," Mr Hall says "Another option is to improve the soil, which could mean alleviating soil compaction by the use of spading or other methods, or the use of clay spreading to improve water-holding and nutrient-holding capacities...
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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 Publications
Increasing organic matter (and organic carbon) in soil requires a balance of carbon and nitrogen as well as other nutrients... 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: Ground Cover
Research is being stepped-up into the efficiency of different soils in delivering nitrogen to crops.. Ravensthorpe, WA, grower Bevan Tuckett with an instrument station being used to map different soil types for their responsiveness to nitrogen treatments and their water-holding capacity... Each of the trial strips cross different soil types as mapped by EM and radiometrics, with observations in 2014 showing significant differences in soil moisture, temperature, pH and organic carbon between the soil types at each site. "..
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Catalogue: Ground Cover
Research is being stepped-up into the efficiency of different soils in delivering nitrogen to crops.. Ravensthorpe, WA, grower Bevan Tuckett with an instrument station being used to map different soil types for their responsiveness to nitrogen treatments and their water-holding capacity... Each of the trial strips cross different soil types as mapped by EM and radiometrics, with observations in 2014 showing significant differences in soil moisture, temperature, pH and organic carbon between the soil types at each site. "..
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Catalogue: Ground Cover
The recently developed iPad application SoilMapp uses GPS to identify soil water-holding information for specific locations... Mr Dalgliesh, who has worked on the APSIM (Agricultural Production Systems sIMulator) model for more than 20 years, says experience shows that increased soil information increases the chances of achieving a season's optimum yields and profits... Mr Dalgliesh says the challenge is where current research comes in. Information on the water-holding capacity of an additional 245 soils has been added to the APSoil database ( www.apsim.info/Wiki/APSoil.ashx ), bringing the total to more than 900...
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Catalogue: GRDC Media
Increased knowledge about soil water is allowing growers to better manage risk and match inputs to the productive capacity of their soils, according to agronomist Craig Topham... Agronomist Craig Topham says many growers are already capitalising on their ability to measure and manage water holding capacity... Mr Topham, of Agrarian Management, is one of the 'Soil Water Champions' assisting a research project which aims to improve grower and consultant understanding of how to best use soil water information in farm decision making...
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Catalogue: Broadacre Field Crops DAFF QLD
A qualified irrigation designer experienced with sub-surface drip (SDI) installations should design all systems... An emitter with a value of 1 is non-compensating, meaning any percentage change in pressure results in an equal percentage change in flow rate... Using an assumed SDI irrigation efficiency of 90% the gross irrigation capacity requirement is 14.7 mm/day (13.2 mm/day 0.9)...
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Catalogue: Broadacre Field Crops DAFF QLD
A qualified irrigation designer experienced with sub-surface drip (SDI) installations should design all systems... An emitter with a value of 1 is non-compensating, meaning any percentage change in pressure results in an equal percentage change in flow rate... Using an assumed SDI irrigation efficiency of 90% the gross irrigation capacity requirement is 14.7 mm/day (13.2 mm/day 0.9)...
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