Grain and protein responses to nitrogen applied to wheat growing on a red earth
1991
Angus, J.F. (Commonwealth Scientific and Industrial Research Organisation, Canberra (Australia). Div. of Water and Land Resources) | Fischer, R.A. (Commonwealth Scientific and Industrial Research Organisation, Canberra (Australia). Div. of Plant Industry)
Dryland wheat was fertilized with ammonium nitrate or liquid urea and ammonium nitrate at sowing or about 3 months later over 4 seasons, one of which was a drought. Maximum agronomic efficiencies in the good seasons were between 19 and 25 kg grain per kg applied N; in the drought season, 4 kg grain per kg N. Yield responses to the later applications were close to but slightly less than those of the sowing-time applications. The apparent recovery of fertilizer N in the above-ground plant parts was up to 70 percent in the year of sowing. The results indicate potential for profitable strategic (i.e., conditional upon average-or-better rainfall season), and thus delayed, nitrogen applications to wheat in southeast Australia. Grain protein responses were variable between seasons.
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