Effect of nitrogenous fertiliser on wheat yield and baking quality

Abstract Responses in grain yield and baking quality were obtained from nitrogenous fertilisers in two series of wheat manurial experiments carried out in New Zealand in 1929–30 and over the period from 1957–58 to 1964–65. The responses were greater in the early series, but the influence of the preceding crop was substantial in both. In the recent series the effects on yield responses of time of nitrogen application, time of sowing, class of soil, and seasonal differences were in decreasing order of importance. Forms of fertiliser were not compared. An economic yield response to a fairly high rate of nitrogen may be anticipated only where wheat is grown after a cereal crop, and only where a reasonably high yield is expected. More information is needed on optimum times and rates of nitrogen application. In general, response to a low rate was small, and in some conditions high rates reduced yields. Baking quality was improved by added nitrogen in most of the trials. The smallest improvement followed potatoe...

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