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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
Keywords:sorghum, grain sorghum, fertiliser, plant nutrition, vertosol,
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
Author:Birch, CJ (Associate Professor Colin Birch)
ID Code:94137
Year Published:2010
Deposited By:TIA - Research Institute
Deposited On:2014-09-01
Last Modified:2014-09-01
Downloads:0

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