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Wide gains from lime-driven crop health

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Lime applications can reduce weed burdens in low pH soils.. Despite subsurface pH levels rising only marginally in the four-year period and not reaching the recommended pH of 4.8 for optimal crop root growth, yields for wheat, barley and lupins increased by an average of six to seven per cent (at two sites) where lime was applied... Long-term WA trial data show top-dressed lime that increases the surface pH to above 5.5 can take three to five years to significantly lift subsurface pH below 10 centimetres (longer for below 20cm) and improve crop yields...
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