Crop-topping or desiccation effects on weed control and seed quality
This trial is to be read in conjunction with ‘Related trials’ where listed in the ‘Trial details’ section below, in addition to the associated ‘Trial report’ and introductory material in the Southern Pulse Agronomy Results Summary where included under the ‘Trial report and attachments’ tab.
Jason Brand (DPIVic) Luke Gaynor (IINSW) Larn McMurray (SARDI)
Southern Pulse Agronomy
To assess wether recent field pea breeding advancements in resistance to blackspot are significant enough to allow management changes to sowing time in this crop.
The dry and hot November in 2009 led to early senescence of pulse varieties and reduced
grain yields in later maturing varieties. Many responses to the crop-topping treatments may
have been masked by this rapid senescence eg Almaz and GenesisTM114 chickpeas.
Some surprising results were observed in 2009, which may be due to either genetic
responses or responses to rapid finish to the season eg forage pea grain weights.
Field peas and Faba beans generally showed no yield loss at the recommended timing for
crop-topping of ryegrass in 2009. Lentils and chickpeas showed significantly higher yield
losses from crop-topping, averaging 15 and 21% yield losses respectively at this timing.
The large biomass, mid-late maturing lentil Boomer also showed a yield loss when croptopped later than recommended for ryegrass control. These results indicate poor suitability of some lines to this agronomic practice.
Early maturing lentil and chickpea lines showed yield losses from this practice at the
recommended timing. This demonstrates the difficulty in employing this weed control
technique in these crop types.
The early crop topping treatment reduced grain yields of most pulse varieties. Field peas
OZP0602 and Yarrum at Turretfield, and the Faba bean AFO3001 showed no difference in
grain yield at the early cop-top timing and the nil, indicating good suitability to this practice.
Lead research organisation
Department of Primary Industries VIC
Host research organisation
Trial funding source
Trial funding source
Trial funding source
Trial funding source
Southern Pulse Agronomy
The authors wish to thank the contributions of the following people to this project:
Russel Argall, Jason Ellifson and Justine Ellis, DPI – Horsham
Jenny Davidson, SARDI
Peter Matthews and Eric Armstrong, II NSW
The authors wish to acknowledge the support and assistance of the following people:
Michael Materne, Kristy Hobson and Tony Leonforte, PBA, DPI – Horsham.
Jeff Paull, PBA, Uni of Adelaide.
Ian Menz, II NSW
The assistance and help of John Nairn, Peter Maynard, Mark Bennie, Rowan Steele and Stuart
Sherriff, SARDI Clare, with trial management is gratefully acknowledged.
Trial source data and summary not available Check the trial report PDF for trial results.
Derived climate information
No observed climate data available for this trial. Derived climate data is determined from trial site location and national weather sources.
NOTE: Exact trial site locality unknown - Climate data may not be accurate
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.
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