Plant growth regulants (PGR)

CC BY 4.0

Research organisaton
Funding source

Trial details

Researcher(s) Nicole Dimos (SPAA)
Sam Trengove (SPAA)
Year(s) 2011
Contributor Society of Precision Agriculture Australia
Trial location(s) Marrabel, SA
Plant growth regulants (PGR) locations

To assess the effects of plant growth regulants (PGR’s) on crop growth and grain yield across variable soils in barley.

Key messages

Yield differences between treatments were highly significant. Differences observed between the growth regulant treatments and nil were up to 0.5t/ha along the trial strip. The yield differences were not significant at the northern end of the trial strips, this is where localised waterlogging was observed in the trial and crop growth was reduced before the growth regulants were applied, as observed in the crop spec data.

Lead research organisation Society of Precision Agriculture Australia
Host research organisation N/A
Trial funding source GRDC SPA000010
Related program N/A

This project was funded by the Grains Research and Development Corporation (GRDC)

Other trial partners Kym and Katie I’Anson (property owners)
Download the trial report to view additional trial information


Crop type Barley
Treatment type(s)
  • Growth regulator: Type
Trial type Precision agriculture
Trial design Not applicable

Marrabel 2011

Sow date Not specified
Harvest date Not specified
Plot size Not specified
Plot replication Not specified
Download the trial report to view additional method/treatment information
Trial source data and summary not available
Check the trial report PDF for trial results.
Observed trial site soil information
Trial site soil testing
Not specified
Soil conditions
Trial site Soil texture
Marrabel, SA Clay
Derived trial site soil information
Australian Soil Classification Source: ASRIS
Trial site Soil order
Marrabel, SA Sodosol
Soil Moisture Source: BOM/ANU
Average amount of water stored in the soil profile during the year, estimated by the OzWALD model-data fusion system.
Year Marrabel SA
2011 331.1mm
2010 343.5mm
2009 329.5mm
2008 306.2mm
2007 326.3mm
2006 315.6mm
2005 349.6mm
2004 343.0mm
2003 384.0mm
2002 365.3mm
2001 444.3mm
2000 500.4mm
National soil grid Source: CSIRO/TERN
NOTE: National Soil Grid data is aggregated information for background information on the wider area
Actual soil values can vary significantly in a small area and the trial soil tests are the most relevant data where available

Soil properties



Derived climate information

No observed climate data available for this trial.
Derived climate data is determined from trial site location and national weather sources.

Marrabel SA

NOTE: Exact trial site locality unknown - Climate data may not be accurate

Some data on this site is sourced from the Bureau of Meteorology

SILO weather estimates sourced from
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.

Trial last modified: 30-09-2019 15:11pm AEST