Evaluating gypsum and polyacrylamide use on irrigated pasture in northern Victoria

Andrew Sneyd

 Ancon-Agri 26 Clarence St. Shepparton, Vic, 3630, sneydkidz@optusnet.com.au


The purpose of this research was to investigate the application of varying rates of gypsum and the liquid formulation polyacrylamide (PAM) Flobond™ on a ryegrass and shaftal clover pasture to determine the effects on germination and pasture yield in northern Victoria. Eight treatments were applied post sowing and incorporated with irrigation. Three treatments of gypsum alone, Flobond™ alone and with gypsum also the untreated control. The results of this trial found that rates of 5t/ha and 10t/ha of gypsum applied alone did reduce the establishment of the Turbo cv. shaftal clover (Trifolium resupinatum). No other treatments reduced the establishment of either the Turbo cv. clover or the Jackpot cv. ryegrass (Lolium Multiflorum).

Pasture yield was estimated by taking four biomass cuts during the trial which ran from March to November 2018. The treatments which had reduced clover establishment were able to compensate in yield by the first biomass cut 53 days after treatment (DAT). There was no statistical difference between treatments at either a biomass cut or cumulatively during the trial. The treatments of Flobond™ alone and with lower more economic rates of gypsum did have higher yields which show potential for further work with other formulations of PAM to reduce the costs of amending soil structure and improving water infiltration. The liquid formulation of Flobond™ was difficult to apply which may limit its potential use in this market.


The Australian Society of Agronomy is the professional body for agronomists in Australia. It has approximately 500 active members drawn from government, universities, research organisations and the private sector.

Photo Credits

David Marland Photography david_marland@hotmail.com Graham Centre for Agricultural Innovation, Charles Sturt University

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