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Catalogue: GRDC Updates
Agricultural soils have lost approximately half (~ 50 t/ha) of their organic carbon since the industrial revolution, a loss that has greatly contributed to soil degradation... We have shown, in experiments with wheaten straw incubated in a variety of soils, that the conversion of the straw into humus (which is much richer in N, P and S than are crop residues) is increased three to tenfold by augmenting the residues with supplementary nutrients according to the established ratios... We hypothesised that adding some extra nutrients (N, P and S) would lead to more microbes being formed than without the extra nutrients and that this would lead to faster stubble decomposition and more plant-C being transformed into humus-C because, we believe, humus is largely dead microbes not dead plant material...
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Catalogue: GRDC Research Summaries
" Increasing the capacity of wheat to extract phosphorus from soils... High-grade P fertilizer is manufactured from rock phosphate which is a limited resource mined from of a few major deposits in north Africa, China and the USA. Rock phosphate it is a highly traded commodity on the world market and demands for fertilizer are expected to increase significantly over the next 50 years... Large price fluctuations during 2007/2008 saw the cost of phosphorus fertilizers in Australia rise by 400% which was detrimental to farmer profits...
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Catalogue: GRDC Research Summaries
" Increasing the capacity of wheat to extract phosphorus from soils... High-grade P fertilizer is manufactured from rock phosphate which is a limited resource mined from of a few major deposits in north Africa, China and the USA. Rock phosphate it is a highly traded commodity on the world market and demands for fertilizer are expected to increase significantly over the next 50 years... Large price fluctuations during 2007/2008 saw the cost of phosphorus fertilizers in Australia rise by 400% which was detrimental to farmer profits...
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Catalogue: Ground Cover
CliMate displays data such as stored soil water and nitrogen... CliMate estimates stored soil moisture based on individual paddock data, such as the length of the fallow period, the amount of soil organic matter, stubble load, soil type and rainfall received during the fallow period... Research undertaken over several years by NSW DPI staff such as Col McMaster and Barry Haskins (now a private researcher/consultant) noted that delayed or missed fallow weed control opportunities quickly led to loss of stored soil moisture, as well as loss of more than 40kg/ha of available soil nitrogen...
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Catalogue: Ground Cover
CliMate displays data such as stored soil water and nitrogen... CliMate estimates stored soil moisture based on individual paddock data, such as the length of the fallow period, the amount of soil organic matter, stubble load, soil type and rainfall received during the fallow period... Research undertaken over several years by NSW DPI staff such as Col McMaster and Barry Haskins (now a private researcher/consultant) noted that delayed or missed fallow weed control opportunities quickly led to loss of stored soil moisture, as well as loss of more than 40kg/ha of available soil nitrogen...
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Catalogue: GRDC Factsheets
Before biochar can be widely adopted in agriculture, better understanding is needed of its properties and how it interacts - both positively and negatively - with the soil... Gas chambers are used to measure greenhouse gas emissions from a soil amended with biochar in Western Australia... Applications of biochar to soil have demonstrated improvements in the physical structure of the soil by: increasing water-holding capacity (in sandy soils); reducing the tensile strength of hardsetting soil; altering the soil thermal properties; and improving physical conditions for increased earthworm populations...
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Catalogue: GRDC Factsheets
Before biochar can be widely adopted in agriculture, better understanding is needed of its properties and how it interacts - both positively and negatively - with the soil... Gas chambers are used to measure greenhouse gas emissions from a soil amended with biochar in Western Australia... Applications of biochar to soil have demonstrated improvements in the physical structure of the soil by: increasing water-holding capacity (in sandy soils); reducing the tensile strength of hardsetting soil; altering the soil thermal properties; and improving physical conditions for increased earthworm populations...
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Catalogue: GRDC Factsheets
Before biochar can be widely adopted in agriculture, better understanding is needed of its properties and how it interacts - both positively and negatively - with the soil... Gas chambers are used to measure greenhouse gas emissions from a soil amended with biochar in Western Australia... Applications of biochar to soil have demonstrated improvements in the physical structure of the soil by: increasing water-holding capacity (in sandy soils); reducing the tensile strength of hardsetting soil; altering the soil thermal properties; and improving physical conditions for increased earthworm populations...
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Catalogue: Ground Cover
Recent research suggests that nitrogen tie-up may improve the ability of soils to hold nitrogen in the root zone where it is most needed By Bernie Reppel.. CSIRO Land and Water scientist Jeff Baldock says the tie-up process can also be a positive in a wellfunctioning farming system if it improves the soil"s ability to hold nitrogen in the root zone, preventing it from leaching too far down for crop roots to reach... "Work by my fellow soil scientists Dr David Roget and Dr Gupta Vadakattu suggests that soils with good levels of biological activity can hold up to 40 kilograms of nitrogen per hectare in the root zone for subsequent release and use by plants," Dr Baldock says...
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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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