Vegetative nitrogen stress decreases lodging risk and increases yield of irrigated spring wheat in the subtropics
Article
Article Title | Vegetative nitrogen stress decreases lodging risk and increases yield of irrigated spring wheat in the subtropics |
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ERA Journal ID | 5177 |
Article Category | Article |
Authors | Peake, A.S. (Author), Bell, K.L. (Author), Carberry, P.S. (Author), Poole, N. (Author) and Raine, S.R. (Author) |
Journal Title | Crop and Pasture Science |
Journal Citation | 67 (9), pp. 907-920 |
Number of Pages | 14 |
Year | 2016 |
Publisher | CSIRO Publishing |
Place of Publication | Australia |
ISSN | 0004-9409 |
1836-0947 | |
1836-5795 | |
Digital Object Identifier (DOI) | https://doi.org/10.1071/CP16052 |
Web Address (URL) | http://www.publish.csiro.au/cp/CP16052 |
Abstract | In-crop nitrogen (N) application is used widely in rainfed winter wheat production to reduce lodging risk; however, uncertainty exists as to its ability to reduce lodging risk in subtropical irrigated wheat production without simultaneously reducing yield potential. The objective of this study was therefore to determine whether in-crop N application reduces lodging risk without reducing yield of irrigated spring wheat in a subtropical environment. Irrigated small-plot experiments were conducted to compare the effect of alternative N timing on lodging and yield in two cultivars. Variable N regimes were imposed during the vegetative growth phase, after which additional N was applied to ensure that total season N application was uniform across N-timing treatments. Treatments with low N at sowing had significantly less lodging and were the highest yielding, exhibiting yield increases of up to 0.8 t ha–1 compared to treatments with high N at sowing. Increased leaf area index, biomass and tiller count at the end of the vegetative growth phase were correlated with increased lodging in both cultivars, although the strength of the correlation varied with cultivar and season. We conclude that canopy-management techniques can be used to simultaneously increase yield and decrease lodging in irrigated spring wheat in the subtropics, but require different implementation from techniques used in temperate regions of Australia. |
Keywords | G×E×M, in-season nitrogen, irrigation, plant population, split nitrogen, yield potential. |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 300407. Crop and pasture nutrition |
300403. Agronomy | |
Public Notes | Files associated with this item cannot be displayed due to copyright restrictions. |
Byline Affiliations | School of Agricultural, Computational and Environmental Sciences |
Department of Primary Industries and Fisheries, Queensland | |
International Crops Research Institute for the Semi-Arid Tropics (ICRISAT), India | |
Foundation for Arable Research, Australia | |
Institute for Agriculture and the Environment | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q3v61/vegetative-nitrogen-stress-decreases-lodging-risk-and-increases-yield-of-irrigated-spring-wheat-in-the-subtropics
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