Nutrition for Hyper Yielding Wheat cv Stockade- TAS

• There was no significant positive response to applied nitrogen fertiliser.
• Applied nitrogen input higher than 120kg N/ha only served to reduce yield, although the reduction in yield was not statistically significant until the N applied exceeded 200kg N/ha (240 & 280 N applied).
• With 110kg N/ha in the soil 0 – 60cm on 11 July the zero N treatment (only 10kg N/ha MAP applied) yielded 11.55t/ha with a protein of 10.9% indicating the presence of 221kg N/ha in grain.
• If 75% of the N is assumed to be in the grain and 25% in the straw residue then the total N uptake at harvest in zero N plots would be approximately 294kg N/ha.
• With 10kg N/ha from the MAP and approximately 100kg N/ha in the soil in July it would indicate that 184kg N/ha came from deeper in the soil profile and or mineralization through the course of the season.
• There were no differences in grain protein, test weight and screenings, although there was a trend for increased N applied to increase grain protein up to a level of 160 N.

Variety: Stockade

Rotation position: 2022 poppies
Soil type: Chromosol
Nitrogen 0 – 60cm: 110.4kg N/ha
Colwell P (ppm) 0-10cm: 225.9
pH (CaCl2) 0-10cm: 6.31
Organic Carbon (%) 0-10cm: 1.87
Irrigation: 94mm