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Geophysical surveys help solve soils/profits puzzles

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An authority in soil science is among those suggesting closer long-term scrutiny of soil health using precision agriculture (PA) technology and on-farm trials to rectify areas where crops under-perform because of poor water use efficiency... Esperance-based David Hall, of the Department of Agriculture and Food, Western Australia (DAFWA), says root growth and water use by crops are often restricted by subsoil constraints including sodicity, salinity, boron toxicity and acidity which, to some extent, can be alleviated by applying gypsum... At the Mt Madden Field Walk in September 2010, Mr Hall observed the crop growth differences between the treatments highlighted the short-term benefit of gypsum in helping to increase crop emergence, root growth, water infiltration and water storage...