Nitrogen, deep phosphorus and potassium: a picture says a thousand words – QLD (Booklet)
This booklet from the Grains Research and Development Corporation (GRDC) outlines paddock-scale field trials evaluating nitrogen and deep phosphorus strategies under the RiskWi$e initiative in Queensland. Conducted with 30 growers across multiple sites, the trials are assessing nutrient responses in wheat, using satellite imagery, yield mapping and on-farm machinery to capture crop and soil variability. This paper explores the results of three of these trials, situated at Wallumbilla, Surat and St George. Preliminary results show strong biomass and yield responses to deep phosphorus at low-phosphorus sites, particularly when combined with nitrogen. In almost all trials there was no economic response to nitrogen, noting data is still being collated, and statistical analysis is yet to be completed. While the content focuses on Queensland, the findings are relevant to other Australian cropping regions [PDF 1.6 KB, 16 pages].#
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