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Sorghum grain P concentration and removal at a long-term N x P experiment in southern Queensland
Citation
Lester, DW and Birch, CJ and Dowling, CW, Sorghum grain P concentration and removal at a long-term N x P experiment in southern Queensland, Proceedings of the 1st Australian Summer Grains Conference, 21-24 June 2010, Gold Coast, Australia, pp. 1-7. (2010) [Non Refereed Conference Paper]
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Abstract
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.
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.
Item Details
| Item Type: | Non Refereed Conference Paper |
|---|---|
| Keywords: | grain sorghum, phosphorus long term trials, plant nutrition, fertiliser |
| Research Division: | Agricultural and Veterinary Sciences |
| Research Group: | Crop and Pasture Production |
| Research Field: | Crop and Pasture Nutrition |
| Objective Division: | Plant Production and Plant Primary Products |
| Objective Group: | Summer Grains and Oilseeds |
| Objective Field: | Sorghum |
| UTAS Author: | Birch, CJ (Associate Professor Colin Birch) |
| ID Code: | 94136 |
| Year Published: | 2010 |
| Deposited By: | Tasmanian Institute of Agriculture |
| Deposited On: | 2014-09-01 |
| Last Modified: | 2014-09-01 |
| Downloads: | 0 |
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