Nitrogen guides
Rates, urea and ammonium sulphate, and how much nitrogen is lost to the air.
Nitrogen
How much urea per hectare for wheat? A worked rule of thumb
About 40 kg N per t/ha of wheat yield, minus soil nitrogen, divided by 0.46. A worked urea example with the assumptions stated and the limits spelled out.
Updated 17 October 2026
Nitrogen
Nitrogen budget for wheat: a step-by-step worked example
Follow GRDC’s published wheat nitrogen budget from rainfall to soil test to a urea rate (311 kg/ha in the example), and see where the method can go wrong.
Updated 17 October 2026
Nitrogen
Urea volatilisation: how much nitrogen do you really lose?
Australian field data on ammonia loss from surface urea: an 8% national median, a 0–48% range, what drives it, and how drilling or timely rain cuts it.
Updated 17 October 2026
Nitrogen
Urea vs ammonium sulphate: which is cheaper per kg of N?
Compare urea (46% N) and ammonium sulphate by nitrogen per tonne, sulphur, nitrogen loss and acidification, with a cost-per-kg-N example and the lime caveat.
Updated 17 October 2026