Environmental control of potential yield of sunflower in the subtropics

Bange, MP, Hammer, GL and Rickert, KG (1997) Environmental control of potential yield of sunflower in the subtropics. Australian Journal of Agricultural Research, 48 2: 231-240. doi:10.1071/A96079

Author Bange, MP
Hammer, GL
Rickert, KG
Title Environmental control of potential yield of sunflower in the subtropics
Journal name Australian Journal of Agricultural Research   Check publisher's open access policy
ISSN 0004-9409
Publication date 1997-01-01
Year available 1997
Sub-type Article (original research)
DOI 10.1071/A96079
Open Access Status
Volume 48
Issue 2
Start page 231
End page 240
Total pages 10
Place of publication COLLINGWOOD
Language eng
Abstract A simple framework was used to analyse the determinants of potential yield of sunflower (Helianthus annuus L.) in a subtropical environment. The aim was to investigate the stability of the determinants crop duration, canopy light interception, radiation use efficiency (RUE), and harvest index (HI) at 2 sowing times and with 3 genotypes differing in crop maturity and stature. Crop growth, phenology, light interception, yield, prevailing temperature, and radiation were recorded and measured throughout the crop cycle. Significant differences in grain yield were found between the 2 sowings, but not among genotypes within each sowing. Mean yields (0% moisture) were 6 . 02 and 2 . 17 t/ha for the first sowing, on 13 September (S1), and the second sowing, on 5 March (S2), respectively. Exceptionally high yields in S1 were due to high biomass assimilation associated with the high radiation environment, high light interception owing to a greater leaf area index, and high RUE (1 . 47-1 . 62 g/MJ) across genotypes. It is proposed that the high RUE was caused by high levels of available nitrogen maintained during crop growth by frequent applications of fertiliser and sewage effluent as irrigation. In addition to differences in the radiation environment, the assimilate partitioned to grain was reduced in S2 associated with a reduction in the duration of grain-filling. Harvest index was 0 . 40 in S1 and 0 . 25 in S2. It is hypothesised that low minimum temperatures experienced in S2 reduced assimilate production and partitioning, causing premature maturation.
Keyword Agriculture, Multidisciplinary
Harvest Index
Radiation Use Efficiency
Radiation-use Efficiency
Standard-height Sunflower
Biomass Accumulation
Light Interception
Leaf Nitrogen
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Agriculture and Food Sciences
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Citation counts: TR Web of Science Citation Count  Cited 17 times in Thomson Reuters Web of Science Article | Citations
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Created: Tue, 14 Aug 2007, 02:40:36 EST