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deep soil nitrogen

Catalogue: Ground Cover
Deep soil testing to 40 centimetres or below across Western Australia's agricultural regions has revealed there is more nitrogen in the subsoil that can be accessed by crops than previously realised... Testing to the depths provides detailed mineral nitrogen (ammonium plus nitrate) profiles through subsoil layers and can help diagnose any potential crop production constraints, such as an acid band, compaction or hardpan... Where there were no root constraints in the subsoil, deep mineral nitrogen found at 100cm to 120cm was up to 60 per cent as effective as the same amount of nitrogen in 0 to 20cm and Dr Oliver says it should be accounted for in fertiliser decisions in these situations...
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