Effects of nitrogen supply on canopy development of maize and sunflower

Massignam, A. M., Chapman, S. C., Hammer, G. L. and Fukai, S. (2011) Effects of nitrogen supply on canopy development of maize and sunflower. Crop and Pasture Science, 62 12: 1045-1055.


Author Massignam, A. M.
Chapman, S. C.
Hammer, G. L.
Fukai, S.
Title Effects of nitrogen supply on canopy development of maize and sunflower
Journal name Crop and Pasture Science  (ERA 2012 Listed)    (ERA 2010 Rank A)   Check publisher's open access policy
Publication date 2011
Sub-type Article
Year available 2012
DOI 10.1071/CP11165
Volume number 62
Issue number 12
ISSN 0004-9409; 1836-0947; 1836-5795
Start page 1045
End page 1055
Total pages 11
Place of publication Collingwood, VIC, Australia
Publisher CSIRO Publishing
Collection year 2012
Language eng
Formatted abstract Nitrogen (N) limitation reduces canopy carbon assimilation by directly reducing leaf photosynthesis, and by developmentally reducing the rate of new leaf area development and accelerating leaf senescence. Effective use of N for biomass production under N limitation may be considered to be a result of a trade-off between the use of N to maintain high levels of specific leaf nitrogen (SLN the amount of N per unit leaf area) for high photosynthetic rate versus using N to maintain leaf area development (leaf area index – LAI). The objective here is to compare the effects of N supply on the dynamics of LAI and SLN for two crops, maize (Zea mays L.) and sunflower (Helianthus annuus L.) that contrast in the structure and development of their canopy. Three irrigated experiments imposed different levels of N and plant density. While LAI in both maize and sunflower was reduced under N limitation, leaf area development was more responsive to N supply in sunflower than maize. Observations near anthesis showed that sunflower tended to maintain SLN and adjust leaf area under reduced N supply, whereas maize tended to maintain leaf area and adjust SLN first, and, when this was not sufficient, SLN was also reduced. The two species responded differently to variation in N supply, and the implication of these different strategies for crop adaptation and management is discussed.
Keyword Helianthus annuus L.
Leaf area index
Leaf size
N demand
Specific leaf nitrogen
Zea mays L.
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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Created: Mon, 13 Feb 2012, 15:53:48 EST by Professor Graeme Hammer on behalf of School of Agriculture and Food Sciences