High Speed photo of fertiliser particles travelling along the spinner vane

Spinner Technology

The Marshall Multispread Spinner design is a result of Roesner Pty Ltd’s on-going Spinner Research and Development programme. The goals of this programme are to develop a spinner design that enables;

  • Wider spread widths to reduce fertiliser, fuel and labour costs;
  • Accurate spread patterns that ensure correct placement of nutrients in the field, optimising crop growth and minimising environmental run-off;
  • A simple machine setup across a range of fertiliser types.

The Science of Spinner Design

Roesner Pty Ltd uses scientific techniques to design and test spinner designs prior to physical testing in real-life conditions. These techniques include High-speed Photography, Numerical Modelling, Bespoke Particle Collection Equipment and Physical Testing of fertiliser properties.

Physical testing is carried out using the Australia Fertiliser Services Association (AFSA) ACCUSpread testing regime.



There are many external variables that affect the spreading performance of the Marshall Multispread. It is important the wind speed and direction, ground contour, plant height and fertiliser consistency are considered prior to determining the spreader settings and width of pass. For more details see the Support page.

Roesner’s on-going research is currently focused on the characterisation and performance testing of different fertiliser types; investigation into how variables such as wind speed and changes in fertiliser consistency affect spread patterns; and the correlation of spreader performance with crop yield for different soil types and climatic conditions.

Computational Fluid Dynamics of Air Flow around spinner disc at 900 RPM

Fertiliser type:


TEST DATE: 5 May 2015
Type D2 Vanes 36m Spread Width at 15% CV

Fertiliser type:


TEST DATE: 18 March 2013
Type D1 Vanes 36m Spread Width at 15% CV

Fertiliser type:


TEST DATE: 18 March 2013
Type D1 Vanes 36m Spread Width at 15% CV

Fertiliser type:

Lime (Aglime)

TEST DATE: 20 February 2017
Type D1 Vanes 16m Spread Width at 25% CV

Fertiliser type:

Sulphate of Ammonia
(Crystalline Grade)

Type D1 Vanes 18m Spread Width at 15% CV

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