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Loretta Serafin, Mark Hellyer and James Filby (NSW DPI)
|Contributor||Department of Primary Industries NSW|
Willow Tree, NSW
|Further information||View external link|
To quantify the contribution of different sunflower leaves to yield and oil quality by applying 12 leaf defoliation treatments.
Sunflowers are generally considered a minor crop in the northern grains region. However, they play an important role in providing a broadleaf summer crop rotation option. An individual sunflower plant produces on average 2000–6,000 cm2 of leaf area, which drives yield and oil content.
Identifying which leaves contribute most towards yield and oil content helps inform decisions around disease, pest and general crop management in sunflower crops. Whether it is because the crop is infected with a disease such as powdery mildew, or has insect damage e.g. loopers, the end result is a need for growers and advisors to know where and when to spend money in crop protection to achieve the best economic return on investment through maintaining green leaf area.
|Lead research organisation||
Department of Primary Industries NSW
|Host research organisation||N/A|
|Trial funding source||GRDC DAN00197|
|Trial funding source||DPI NSW DAN00197|
Tactical agronomy for selected crops in the northern region (safflower, linseed, sunflower)
This experiment was part of the project Tactical agronomy for selected crops in the northern region (safflower, linseed, sunflower) (DAN00197), with joint investment by NSW DPI and GRDC. Thanks to Nuseed and Neil Weier for the supplying seed for the experiment. Technical assistance provided by Delphi Ramsden, Alice Bowler, Max Cloake and Jim Perfrement (NSW DPI) is gratefully acknowledged. Thanks to Joe Fleming, ‘Parraweena’, Willow Tree for hosting the experiment. Thanks to Neroli Graham for assistance with the statistical analysis.
|Other trial partners||Joe Fleming, ‘Parraweena’, Willow Tree|
|Sow date||9 October 2016|
|Harvest date||24 February 2017|
|Plot size||Not specified|
|Plot replication||Not specified|
|Fertiliser||<ul> <li>150 kg/ha Gold N pre-sowing</li> <li>10 L/ha Amps Kickstart plus Petrik applied at sowing</li> </ul>|
|Other trial notes||<p>Crop type: Sunflower (Hybrid: Ausigold 62)</p>|
||Head diameter (cm)||Plant height (cm)||Head arc length (cm)|
|1||█ Control - no leaves removed (0/3)||19.1||144.7||21.4|
|2||█ Budding - remove all leaves (3/3)||3.6||117.5||3.2|
|3||█ Budding - remove top 10 leaves (1/3)||18.1||146.8||17.6|
|4||█ Budding - remove top 20 leaves (2/3)||9.8||137.6||7.7|
|5||█ Budding - remove bottom 10 leaves (1/3)||19.6||152.5||22.2|
|6||█ Start of flowering - remove top 10 leaves (1/3)||18.1||146.6||19.4|
|7||█ Start of flowering - remove top 20 leaves (2/3)||17.1||132.9||16.9|
|8||█ Start of flowering - remove all leaves (3/3)||11.6||139.4||10.4|
|9||█ Start of flowering - remove bottom 10 leaves (1/3)||19.2||146.3||21.2|
|10||█ Flowering complete - remove top 10 leaves (1/3)||18.1||139.4||19.6|
|11||█ Flowering complete - remove top 20 leaves (2/3)||19.6||157.3||20.6|
|12||█ Flowering complete - remove all leaves (3/3)||17.5||138.9||17.6|
|Rainfall avg ann (mm)||668.9mm|
|Rainfall trial gsr (mm)||639mm|
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.