In the past two years of the three-year trial, the project found using liquid phosphorus and granular phosphorus performed similarly at Streaky Bay in the wetter 2016 season.  In the previous two years, phosphoric acid resulted in 13 per cent and 8 per cent higher yields in 2014 and 2015, respectively.

In 2016 there was a small yield response to phosphoric acid over granular phosphorus at Warramboo in drier seasonal conditions.

With the trial not showing significant yield responses using trace elements or fungicides, and the cost of fungicide applications ranging from $8 to $22/ha, growers need to think carefully before adding it into their system.


Previous research has shown the movement of phosphorus to the plant roots in the soil water is restricted in drier soil conditions. Fluid fertilisers are able to diffuse away from the point of application in lower soil moisture conditions and are less likely to be fixed by calcium in soils with high levels of calcium carbonate.

Fluid delivery systems can vary: all of the fungicide can be put below or alongside the seed in the soil to protect the seedling roots, or it can be split, with half placed above the seed on the furrow, which will allow it to wash into the soil and protect the crown roots as they emerge


July, 2014


June 2017

Project participants

SARDI: Amanda Cook

The problem

Fluid delivery systems are becoming more popular as producers look to upgrade their machinery and systems.

The research

This project looked to evaluate if there was an advantage in using a fluid delivery system at seeding over current systems.

More information

Amanda Cook
08 8680 6233
[email protected]

Research aims

The trial aims to investigate fluid delivery systems, looking at increasing nutrient use efficiency by using fluid delivery systems, and also looking at new fungicide products available for Rhizoctonia management.

In the field

Trials were conducted at Streaky Bay on grey calcareous soil, and at Warramboo, which has red sand soils. Both sites have alkaline pH, reasonable soil phosphorus levels and Rhizoctonia as a major disease issue.

The trial investigated different nutrient delivery. DAP or 18:20 was used as the standard treatment to compare different phosphorous sources and different trace element sources. Two fungicides for Rhizoctonia management were also used to see if they increase crop production and crop growth, and ultimately crop yield for growers.