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Low protein: is it timing decision making or something else?

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Low protein in cereal grains is indicative of poor nitrogen supply to the grain during the grain fill period... Figure 6: Relative wheat varietal nitrogen uptake performance assessed by grain nitrogen content (kg/ha) - Qld and NW NSW NVT Trials - 2011.. Soil test data from autumn 2012 suggests that many paddocks had no benefit from normal 20 - 50 kg/ha summer fallow N mineralisation due to losses from waterlogging or the >20 kg/ha residual mineral N present in the post-harvest ( Figure 2)...