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Clay

Catalogue: GRDC Publications
Testing of clays is recommended... Dave warns that stock health must be monitored and treated on newly ploughed crops... Peter chose the highest rate of subsoil material of between 200 to 300t/ha of clay rich subsoil to apply to his damaged back paddocks...
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Catalogue: GRDC Media
New resource delves into the issue of claying Remediating sandy soils with clay-rich subsoil can generate substantial crop yield improvements, provided that appropriate methods are followed... The Grains Research and Development Corporation (GRDC) has just produced a new publication in which eight growers - including four from SA and one from Victoria - share their stories about their use of clay in improving their soils and productivity... It is critical that growers plan in detail each stage of the process and follow the best practice. "..
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Catalogue: GRDC Media
New resource delves into the issue of claying Remediating sandy soils with clay-rich subsoil can generate substantial crop yield improvements, provided that appropriate methods are followed... The Grains Research and Development Corporation (GRDC) has just produced a new publication in which eight growers - including four from SA and one from Victoria - share their stories about their use of clay in improving their soils and productivity... It is critical that growers plan in detail each stage of the process and follow the best practice. "..
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Catalogue: GRDC Media
Remediating sandy soils with clay-rich subsoil can often generate substantial crop yield improvements, providing appropriate methods are followed... The Grains Research and Development Corporation (GRDC) has just produced a new publication in which eight growers - including three from WA - share their stories about their use of clay in improving their soils and productivity... According to the GRDC, the millions of hectares of deep sand or sand over clay-rich subsoils which are used for agricultural production, mainly in SA and WA, present a range of challenges due to their poor water-holding capacity, inherent low fertility, extremes of pH, low levels of microbial activity and vulnerability to wind erosion...
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Catalogue: Ground Cover
Experience builds strategies for water-repellent soil.. Recent research indicates that some formulations only work on certain soil types, such as the forest loamy gravels or on firmer soils with reasonable clay content, and are less effective on repellent sands... The results indicate a 55 per cent chance of achieving a yield increase of 400kg/ha or more in year one...
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Catalogue: GRDC Media
Growers need not use high rates of clay or expensive incorporation methods when claying non-wetting soils to improve yields, new Western Australian research suggests... Dr Davies said that in the latest trials, wheat yields improved by at least 0.2t/ha when growing season rainfall was at least 300mm and low rates of clay were incorporated to a shallow depth at sites including Meckering, Bolgart, Badgingarra, Binnu and Balla... Dr Davies said when moderate (150-300t/ha of clay-rich subsoil) and high rates of clay (300t/ha or more of clay-rich subsoil) were incorporated to a shallow depth, there was little additional yield advantage when compared to the lower clay rates...
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Catalogue: GRDC Updates (West)
Mention of a trade name or company in this publication does not imply endorsement of any product or company by the Department of Agriculture and Food, Western Australia... Overall, 60-70 per cent of flour is used in traditional flat breads, 20-25 per cent of flour is used in western style breads and 5-10 per cent is used in cakes and biscuits... In summary, canola varieties sown 2-3 weeks earlier than normal (early to mid April) can be grazed in winter prior to bud elongation (usually providing 600-800 dse grazing days/ha) and recover with no impact on yield or oil...
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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
Overall, soil CEC and SOC content was greatest in the 0.2 and 0.2-2 m fraction, indicating that size, and probably type, of SOM influenced CEC... Kaiser et al. (2003) found that soils with a high content of black carbon showed increased sorption ability compared with plant- and microbial-derived SOM... Addition of organic amendments can increase P availability to plants by decreasing the P adsorption capacity of soils...
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Catalogue: GRDC Updates (South)
The paper is based on the concept that Controlled Traffic Farming (CTF) systems are the future of the grains industry all cropping industries... The paper discusses some of the important production drivers in the grazing operations, being pasture improvement, crop: stock land mix and stocking rate... Using single variant analysis we can see that profit was largely influenced by yield the variation in yield was heavily influenced by how efficient the water was used rather than just the amount of rain received across all regions...
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