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Researcher(s) |
Brian Dunn Tina Dunn |
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Contact email | tina.dunn@dpi.nsw.gov.au |
Year(s) | 2021 |
Contributor | Department of Primary Industries NSW |
Trial location(s) |
Coree, NSW
|
Further information | View external link |
Effect of panicle initiation nitrogen timing on rice grain yield
• At all crop nitrogen levels applying nitrogen at panicle initiation (PI) increased grain yield above where no PI nitrogen was applied.
• When crop nitrogen levels are deficient applying nitrogen close to PI increased grain yield above later applications.
• The timing of PI topdressing nitrogen application had no effect on grain yield when crop nitrogen levels were adequate.
From these preliminary results we can conclude that a rice crop with a low N status requires N topdressing as close to PI as possible. The crop requires more time to use the added N to grow and increase dry matter and yield potential.
This experiment was designed mid way through the 2022 rice season when the question was asked ‘how late is too late to apply N after PI?’. Because of this, only 2 replications of the main plots were possible making it difficult to draw significant conclusions from the results. Therefore, further investigation of the effect PI N application timing has is required to fully identify the differences in treatments.
Lead research organisation |
Department of Primary Industries NSW |
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Host research organisation | N/A |
Trial funding source | AgriFutures PRJ-013235 |
Trial funding source | New South Wales DPI |
Trial funding source | GRDC |
Related program | N/A |
Acknowledgments |
This experiment was part of the ‘Agronomy and remote sensing to maximise rice water productivity’ project, PRJ-013235, 2021–24, with joint investment from AgriFutures and NSW DPI. |
Other trial partners | Not specified |
Crop type | Cereal (Grain): Rice |
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Treatment type(s) |
|
Trial type | Experimental |
Trial design | Replicated |
Sow rate or Target density | 140 kg/ha sowing rate |
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Sowing machinery |
Disc drill seeder |
Sow date | Unknown |
Harvest date | Unknown |
Plot size | Not specified |
Plot replication | Not specified |
Fertiliser |
Please see report |
Other trial notes |
This research paper is an extract from the publication Southern NSW Research Results 2022, available at |
SILO weather estimates sourced from https://www.longpaddock.qld.gov.au/silo/
Jeffrey, S.J., Carter, J.O., Moodie, K.B. and Beswick, A.R. (2001). Using spatial interpolation to construct a comprehensive archive of Australian climate data , Environmental Modelling and Software, Vol 16/4, pp 309-330. DOI: 10.1016/S1364-8152(01)00008-1.