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Effect of water availability and nitrogen source on wheat growth and nitrogen-use efficiency


Kisaakye, E and Botwright Acuna, T and Johnson, P and Shabala, S, Effect of water availability and nitrogen source on wheat growth and nitrogen-use efficiency, Proceedings of the 17th Australian Society of Agronomy Conference, 20-24 September 2015, Hobart, Australia, pp. 1-4. (2015) [Refereed Conference Paper]


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Soil moisture content has a significant impact on soil nutrient availability. Excessive soil moisture due to waterlogging can severely reduce nutrient availability through denitrification, leaching and restricted root growth, which impairs nutrient uptake by plants. This reduces nitrogen (N) uptake and utilization by plants thereby decreasing nitrogen-use efficiency (NUE). Controlled-release fertilizers (CRFs) can improve NUE through synchronisation between N supply and crop demand. A study was conducted to investigate whether timing of N application and source of applied N can alleviate the adverse effects of waterlogging on wheat growth and improve NUE. A split-plot design experiment with irrigation regime as main-plot factor and nitrogen application sub-plot factor was setup. Irrigation regimes included waterlogged and rainfed; nitrogen treatments included: nil N, single-and split-applied urea and CRF. Wheat growth and yield attributes were monitored during stem elongation and anthesis. Grain yield and NUE were determined at harvest. The study findings showed that waterlogging significantly (P<0.05) decreased tiller number, ear number and NUE for all nitrogen treatments. Although split-applied urea had a higher number of tillers and ears than single-applied urea under waterlogged conditions at harvest, there was no significant yield advantage under both irrigation regimes. The CRF increased grain yield by 1t/ha compared to both single- and split- applied urea of the waterlogged treatment. CRF also improved wheat NUE by 7% and 10% under rainfed and waterlogged conditions respectively.

Item Details

Item Type:Refereed Conference Paper
Keywords:triticum aestivum, duplex soil, enhanced-efficiency fertilizers, yield components, nitrogen fertilizer and high rainfall zone
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Crop and pasture production
Research Field:Agronomy
Objective Division:Plant Production and Plant Primary Products
Objective Group:Grains and seeds
Objective Field:Wheat
UTAS Author:Kisaakye, E (Ms Eseeri Kisaakye)
UTAS Author:Botwright Acuna, T (Professor Tina Acuna)
UTAS Author:Johnson, P (Dr Peter Johnson)
UTAS Author:Shabala, S (Professor Sergey Shabala)
ID Code:103202
Year Published:2015
Deposited By:Tasmanian Institute of Agriculture
Deposited On:2015-09-25
Last Modified:2016-05-09
Downloads:143 View Download Statistics

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