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soil acidification

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Catalogue: GRDC Updates
Many soils may already have lost much of this extra, slow release P reserve... Soil testing for available P status commonly involves a Colwell test on the 0-10 cm layer... The paper summarises some recent work that attempts to quantify the differences in availability of sparingly soluble P sources as affected by soil acidification...
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Catalogue: GRDC 2014 Research Summaries
The contributing factors to soil acidification under the current farming systems are well understood, as are the best practice management systems... For such change in practice to be achieved a whole of industry approach is required and this project will combine a reference committee, on-going education, extension and training of key private and government advisors/consultants who will then support growers into the future... The group will be asked to revisit the major barriers to adoption of liming by growers and propose solutions to overcome them while at the same time consider additional challenges posed by the desired doubling of lime use...
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Catalogue: GRDC 2014 Research Summaries
" Soil Acidity and pH Management for Central West Farming Districts.. Central West Farming Systems (CWFS) has identified (Acid soil action initiative, 2000) that the growing incidence, in certain districts, of low pH in the surface (0-10cm) and subsoil (10-30 cm) as a long term trend will limit crop yield in particular districts of low rainfall areas... Current and future decision support tools regarding lime application developed for irrigation and high to safer medium rainfall production regions will not produce management change in marginal medium to low rainfall districts as they fail to address the risk management focus of these lower yield expectation producers ( Mudge 2011)...
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Catalogue: Ground Cover
Frequent application of lime is the only practical method of managing soil acidity By Chris Gazey, Department of Agriculture and Food, Western Australia, Northam, WA, and Dr Stephen Carr, general manager, Precision SoilTech, WA Understanding pH down the soil profile is critical, and bringing soil pH into the optimal range in the top 10 centimetres can be achieved quite easily by surface applications of lime... Lime (alkalinity) is then available to move down the soil profile and lift the subsurface pH. We have observed the soil pH of un-limed plots decreasing by as much as 0.5 pH units to a depth of 30cm over eight years... Long-term Department of Agriculture and Food, Western Australia (DAFWA) lime trials indicate that the old recommendation of 1t/ha every 10 years is too low and many soils that have been limed in the past are continuing to acidify...
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