University of Tasmania
Browse

File(s) under permanent embargo

Sorghum grain P concentration and removal at a long-term N x P experiment in southern Queensland

conference contribution
posted on 2023-05-23, 17:54 authored by Lester, DW, Birch, CJ, Dowling, CW
The northern grains region has few studies reporting nitrogen (N) and phosphorus (P) fertiliser effects on grain P concentration and P removal. From a long-term experiment on the Darling Downs, Queensland, N and P fertiliser independently influenced both grain P concentration and P removal. Generally increasing N fertiliser rate decreased grain P concentration if grain yield increased with N supply, whilst grain P concentration increased with P fertiliser. Five years experimental results indicate seasonal grain P concentration differed significantly making estimating grain P removal from a single value subjective; however a value of 3400 mg P/kg grain at 13.5 % moisture is proposed — similar to other sub-tropical areas, but greater than reported from tropical production zones.
N fertiliser supply increasing grain yield had the largest influence on grain P removal. Where grain yield was not N limited, P export was 20.9, 17.1 and 19.7 kg P/ha highlighting the potential for significant nutrient removal in high production environments. This supports recently reported negative P balances for grain production, and suggests further management investigation for sustainable grain production practices.

History

Publication title

Proceedings of the 1st Australian Summer Grains Conference

Pagination

1-7

Department/School

Tasmanian Institute of Agriculture (TIA)

Place of publication

Australia

Event title

1st Australian Summer Grains Conference

Event Venue

Gold Coast, Australia

Date of Event (Start Date)

2010-06-21

Date of Event (End Date)

2010-06-24

Repository Status

  • Restricted

Socio-economic Objectives

Sorghum

Usage metrics

    University Of Tasmania

    Exports

    RefWorks
    BibTeX
    Ref. manager
    Endnote
    DataCite
    NLM
    DC