Key points
• Two trials over two seasons compared the effect of N fertiliser (urea granules or liquid) mixed with or without humates (granular, coated and liquid) on the grain yield and quality of wheat.
• Soil mineral N was measured in trials to calculate N application rates. Rates ranged from 0-200 kg N/ha.
• There were no significant grain yield or protein benefits from adding humates to N in either trial.
• The use of humates in these wheat production trials was not economic.