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  • Effects of urea formulation on sugarcane yield, nitrogen uptake and nitrous oxide emission in tropical Queensland

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    Author(s)
    Wang, WJ
    Salter, B
    Reeves, SH
    Park, G
    Zahmel, M
    Heenan, MA
    Griffith University Author(s)
    Wang, Weijin
    Year published
    2014
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    Abstract
    THERE IS a genuine need to explore new management practices on sugarcane farms to improve fertiliser nitrogen (N) efficiency and reduce nitrous oxide (N2O, a potent greenhouse gas) emissions while maintaining crop yield. A field experiment was conducted at Ingham in northern Queensland from October 2012 to October 2013 to assess the efficacy of two ‘enhanced efficiency’ nitrogen fertilisers: polymer-coated urea (PCU) and nitrification inhibitor-coated urea (NICU). N2O emissions were measured using both manual and automatic gas sampling chambers. The N release from PCU into soil was considerably slower, which resulted in lower ...
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    THERE IS a genuine need to explore new management practices on sugarcane farms to improve fertiliser nitrogen (N) efficiency and reduce nitrous oxide (N2O, a potent greenhouse gas) emissions while maintaining crop yield. A field experiment was conducted at Ingham in northern Queensland from October 2012 to October 2013 to assess the efficacy of two ‘enhanced efficiency’ nitrogen fertilisers: polymer-coated urea (PCU) and nitrification inhibitor-coated urea (NICU). N2O emissions were measured using both manual and automatic gas sampling chambers. The N release from PCU into soil was considerably slower, which resulted in lower mineral N concentrations in the first 1–2 months after application and maintained higher mineral N levels during the mid to late cropping season than the conventional urea treatments. Lower NO3 – contents in soil were recorded in the NICU treatment than the conventional urea treatment in the initial three months. The annual cumulative N2O emissions amounted to 11.4–18.2 kg N/ha with no significant differences between urea forms and between fertiliser application rates (0, 100 and 140 kg N/ha). The similar N2O emissions suggested that N2O production in this soil was mainly driven by other factors such as rainfall rather than soil mineral N concentrations. The urea formulation did not affect sugarcane yield at the same N application rate. Reduction in the fertiliser application rate from the recommended 140 kg N/ha to 100 kg N/ha decreased sugarcane yield for the conventional urea and PCU treatments but not for the NICU treatment. Crop N uptake also decreased with the decreasing N application rate for the conventional urea, but not for PCU and NICU. These results demonstrated that the coated fertilisers may potentially reduce N application rates without causing N deficiency to the crop. However, further studies are required to investigate the optimal management practices such as application time and rate in relation to soil and climatic conditions.
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    Conference Title
    Proceedings of the 36th Conference of the Australian Society of Sugar Cane Technologists, ASSCT 2014
    Publisher URI
    https://www.assct.com.au/component/edocman/?task=document.viewdoc&id=4188&Itemid=
    Note
    After all reasonable attempts to contact the copyright owner, this work was published in good faith in interests of the digital preservation of academic scholarship. Please contact copyright@griffith.edu.au with any questions or concerns.
    Subject
    Plant biology not elsewhere classified
    Publication URI
    http://hdl.handle.net/10072/172825
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    • Conference outputs

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