23 Oct 2012

Wheat grain nutrient concentrations for south-eastern Australia

Presentation at 2012 ASA Meeting, Armidale, NSW.

Robert M. Norton

Grain nutrient concentrations for selected macronutrients and micronutrients were analyzed from more than 70 NVT sites across southeastern Australia. All nutrients tested showed significant differences among regions. Values for the macro nutrient P were the most variable (3329 ± 661 mg/kg) and on average were 14% more than the commonly used value of 2900 mg/kg. The variation in grain P content could not be related to soil P test, fertilizer application or grain yield although values varied among regions and states. Sulfur and potassium levels also varied and showed significant differences among regions, while grain zinc levels seemed lowest in regions characterized by alkaline soils. These data suggest that regional or even paddock based nutrient concentrations may be required when construction nutrient balances. It may also be useful to use grain micronutrient content as a monitoring tool to indicate the need for fertilizer additions.

International Plant Nutrition Institute, http://anz.ipni.net Email rnorton@ipni.net
Wheat Nutrient content.pdf (size: 1.83 MB)

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