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Researchers in different cropping regions are studying how to lift nutrient use efficiency by manipulating a crop's root systems.. In the south and west, Dr Manny Delhaize from CSIRO Agriculture has discovered that root hairs play a key role in improving the phosphorus use efficiency of wheat in acid soils... University of New England Associate Professor Chris Guppy is using 3-D computer-aided images (below right) of cereal root systems supplied with phosphorus to identify whether they have the capacity to respond to the deep nutrient placement strategies being developed in the northern grains region...