The information contained in this publication is based on knowledge and understanding at the time of writing (July 2017) and may not be accurate, current or complete. The State of New South Wales (including the NSW Department of Industry), the author and the publisher take no responsibility, and will accept no liability, for the accuracy, currency, reliability or correctness of any information included in the document (including material provided by third parties). Readers should make their own inquiries and rely on their own advice when making decisions related to material contained in this publication. The product trade names in this publication are supplied on the understanding that no preference between equivalent products is intended and that the inclusion of a product name does not imply endorsement by the department over any equivalent product from another manufacturer.
| Researcher(s) |
Loretta Serafin, Mark Hellyer and Peter Perfrement (NSW DPI) |
|---|---|
| Year(s) | 2015 - 2016 |
| Contributor | Department of Primary Industries NSW |
| Trial location(s) |
Site 3, Pine Ridge, NSW
|
| Further information | View external link |
| Related trials |
To quantify the contribution of sunflower leaves to yield and oil quality through the application of twelve leaf defoliation treatments.
Sunflowers are generally considered a minor crop in the NSW northern grains region. However, they play an important role in providing a broadleaf summer crop rotation option. An individual sunflower plant produces on average between 2000–6,000 cm2 of leaf area, which drives yield and oil content. Identifying which leaves contribute most towards yield and oil content helps growers make decisions about 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 of maintaining
green leaf area.
This experiment was one of three sunflower leaf-loss sites conducted in the 2015–16 season, with the other sites being located at Gurley and Willow Tree.
| Lead research organisation |
Department of Primary Industries NSW |
|---|---|
| Host research organisation | N/A |
| Trial funding source | GRDC DAN00197 |
| Trial funding source | DPI NSW |
| Related program |
Tactical agronomy for selected crops in the northern region (safflower, linseed, sunflower) |
| Acknowledgments |
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 supply of experiment seed. Technical assistance provided by Delphi Ramsden (NSW DPI), Angus Hombsch, Alice Bowler and Bronwyn Brennan (formerly NSW DPI) is gratefully acknowledged. Thanks also to Neroli Graham, NSW DPI for assisting with data analysis. Thanks to Peter Winton, ‘Windy Station’, Pine Ridge for hosting the experiment. |
| Other trial partners | Peter Winton, ‘Windy Station’, Pine Ridge |
| Crop type |
Sunflower |
|---|---|
| Treatment type(s) |
|
| Trial type | Experimental |
| Trial design | Replicated |
| Sow date | 18 September 2015 |
|---|---|
| Harvest date | 17 February 2016 |
| Plot size | Not specified |
| Plot replication | Not specified |
| Fertiliser |
42 kg/ha Granulock Z applied at sowing |
| Herbicide |
Defoliation applied prior to harvest |
| Other trial notes |
Crop type: Sunflower (Hybrid: Ausigold 62) |
| Sow date | Not specified |
|---|---|
| Harvest date | Not specified |
| Plot size | Not specified |
| Plot replication | Not specified |
| Fertiliser | Not specified |
| Herbicide | Not specified |
| Other trial notes |
Crop type: Sunflower (Hybrid: Ausigold 62) |
| # |
Treatment 1
|
Head diameter (cm) | Plant height (cm) | Head arc length (cm) |
|---|---|---|---|---|
| 1 | █ Control - no leaves removed (0/3) | 16.3 | 130.6 | 23.5 |
| 2 | █ Budding - remove all leaves (3/3) | 6.9 | 121.7 | 9.7 |
| 3 | █ Budding - remove top 10 leaves (1/3) | 17.7 | 132.1 | 24.1 |
| 4 | █ Budding - remove top 20 leaves (2/3) | 13.1 | 133.5 | 18.8 |
| 5 | █ Budding - remove bottom 10 leaves (1/3) | 15.7 | 136.5 | 24.3 |
| 6 | █ Start of flowering - remove top 10 leaves (1/3) | 17.1 | 135.1 | 24.5 |
| 7 | █ Start of flowering - remove top 20 leaves (2/3) | 15.6 | 128.7 | 19 |
| 8 | █ Start of flowering - remove all leaves (3/3) | 8.8 | 128.7 | 16.2 |
| 9 | █ Start of flowering - remove bottom 10 leaves (1/3) | 17.1 | 136.1 | 25.7 |
| 10 | █ Flowering complete - remove top 10 leaves (1/3) | 16.1 | 134.3 | 24.3 |
| 11 | █ Flowering complete - remove top 20 leaves (2/3) | 15.1 | 134 | 22.1 |
| 12 | █ Flowering complete - remove all leaves (3/3) | 13.1 | 129.1 | 22.5 |
| Rainfall avg ann (mm) | 668.9mm |
|---|---|
| Rainfall trial gsr (mm) | 157mm |
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.
