Abstract:
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An examination was made of 271 trials investigating effect of rates of nitrogen fertilisers on wheat to determine the influence of N rate and grain yield response on protein levels in the grain. Eighty two per cent of the trials were not in disgreement with the theory of Toms (1965). At a cost price ratio (CPR) (fertiliser N to wheat grain) = 5. 147 of the trials did not give a profitable response to N fertiliser. In the trials examined, application of the average recommended rate of nitrogen fertilis
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