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Relationship between rainfall-adjusted nitrogen nutrition index and yield of wheat in Western Australia.
- Source :
-
Journal of Plant Nutrition . 2018, Vol. 41 Issue 20, p2637-2643. 7p. - Publication Year :
- 2018
-
Abstract
- Insufficient nitrogen applications may contribute to yield gaps in low rainfall environments of Western Australia (WA). This study tested a nitrogen nutrition index (NNI) for wheat tailored for low rainfall regions, which is based on rainfall-scaled dilution curves. We analyzed yield, shoot biomass, and nitrogen concentration from 32 field trials in WA. An empirical rainfall threshold of 400mm (summerþgrowing season rainfall) returned two parallel dilution curves accounting for the reduction of critical N in drier and lower yielding conditions. Scatterplots of relative yield and rainfall-adjusted NNI returned a robust boundary function that may lead to greater adoption by growers. The NNI defined in this research study can be applied and further tested by growers in WA, but may also apply to other low rainfall environments, to close nitrogen related yield gaps. [ABSTRACT FROM AUTHOR]
- Subjects :
- *NITROGEN fertilizers
*CROP yields
*WHEAT
*RAINFALL
*BIOMASS
Subjects
Details
- Language :
- English
- ISSN :
- 01904167
- Volume :
- 41
- Issue :
- 20
- Database :
- Academic Search Index
- Journal :
- Journal of Plant Nutrition
- Publication Type :
- Academic Journal
- Accession number :
- 135097832
- Full Text :
- https://doi.org/10.1080/01904167.2018.1527934