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Comparative sorghum grain yield responses to fertiliser N under two different fallow lengths
Citation
Lester, DW and Birch, CJ and Dowling, CW and Balzer, M and Hall, D, Comparative sorghum grain yield responses to fertiliser N under two different fallow lengths, Proceedings of the 1st Australian Summer Grains Conference, 21-24 June 2010, Gold Coast, Australia, pp. 1-8. (2010) [Non Refereed Conference Paper]
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Abstract
Fertiliser N responses have been large and consistent for short fallow crops, whilst long fallowing reduces the size and frequency of N response. Grain sorghum on short-fallow consistently responded to applied fertiliser N at higher rates (≥ 80 kg N/ha) than crops grown on long-fallow where either fertiliser at nil or 40 kg N/ha maximised yield. Average yield increase with fertiliser N compared to nil for five short-fallow sorghum crops between 1987-88 and 1999-00 has been 1440, 2650 and 3010 kg/ha for the 40, 80 and 120 kg N/ha respectively. Average agronomic efficiency of N for these crops has been 36, 31 and 22 kg grain per kg fertiliser N applied. Where residual soil N supply for crops is higher — such as after a long-fallow, or a short-fallow crop following a drought-affected long-fallow crop the previous season — fertiliser N impacts on grain yield were smaller.
Item Details
Item Type: | Non Refereed Conference Paper |
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Keywords: | sorghum, grain sorghum, fertiliser, plant nutrition, vertosol, |
Research Division: | Agricultural, Veterinary and Food Sciences |
Research Group: | Crop and pasture production |
Research Field: | Crop and pasture nutrition |
Objective Division: | Plant Production and Plant Primary Products |
Objective Group: | Grains and seeds |
Objective Field: | Sorghum |
UTAS Author: | Birch, CJ (Associate Professor Colin Birch) |
ID Code: | 94137 |
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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