Subsurface acidity: how far has the research advanced? – SA (Webpage)
This Grains Research and Development Corporation (GRDC) webpage explains the difference between soil pH and soil acidification, and the causes of subsurface acidity. Subsurface acidity and stratification (below the top 10 cm) are emerging as serious constraints to crop production across NSW, Victoria, SA and WA. Subsurface acidity cannot be detected with conventional topsoil sampling methods (0-10cm), and targeted sampling to depths at suitable increments is required. Lime rates need to be adjusted to account for subsurface pH, changes in soil texture and organic carbon content down the profile. The efficacy of lime application for treating subsurface issues can be improved by strategic cultivation, deep tillage and soil mixing in sandy soils, and adding organic amendments. Other subsoil constraints (e.g. compaction) should be taken into consideration to maximise treatment impact, along with the risks associated with soil disturbance. While this webpage focuses on South Australian soils, the information is relevant for other southern grain-growing regions.#
This is a carefully curated database of important soil resources. The data base is not exhaustive but rather a library of the resources we believe are the most useful for the audience. Each resource has been added after careful consideration against our selection criteria, including but not limited to its scientific validity, accessibility, and readability. The library generally does not include most academic research papers but may include some open-source papers written in accessible English.
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SSA reminds users that these resources are a guide only. Our understanding of soil science is improving continuously so it is important to check the suitability of the information for your purpose with an appropriately qualified professional such as a Registered Soil Professional or a Certified Professional Soil ScientistÂ
