Welcome to Our Knowledge Hub. It is here you can find all of our past and present projects, trials and demonstrations.

A field scale survey of soil-crop relationships on a water repellent sandy gravel soil

Water repellent gravelly sands may require different management to water repellent sands to improve grain yield. An increase in gravel content can increase soil organic carbon, decrease the amount (kg/ha) of soil phosphorus and potassium and potentially increase leaching of nitrate. The sandy gravels of the Badgingarra area typically have gravelly soils in the higher parts of the landscape and deep sands in the valleys which may have different soil constraints for crop growth. This transect study was completed to quantify which factors are most important for grain yield in a sandy gravel soil.

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Amelioration of water repellent sands – long term impacts

To understand the financial benefit of the many ameliorations options, it is vital to know how long the productivity gains from their implementation are likely to last.  In this trial, large-scale on-farm strip trials with repeated controls using grower seeders and harvesters were applied. This trial deonstrated one-off mouldboard ploughing, rotoary spading and claying.

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Clay spreading reduced frost damage and increased crop yield on water repellent deep sand at Moora

In 2016 DAFWA, in collaboration with the WMG, established three claying trials in the region looking at combinations of different clay rates and incorporation methods using a range of tillage equipment. The aim of the trials was to identify the most cost-effective combination/s and produce practical guidelines for farmers seeking long term improvement for enhanced crop productivity on water repellent soils under local growing conditions.

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Developing and testing innovative, practical and reliable methods for incorporating lime into acidic sandplain subsoils

The trial was aimed at assessing the effectiveness of simple and cheap ‘bolt-on’ attachments to deep ripper tines at incorporating topsoil and applied lime into acidic sandplain subsoils.

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Tillage options for severely repellent sands – which methods work?

Strategic deep tillage can be used to ameliorate soil water repellence and subsoil constraints. One-way disc ploughs have a low capital cost and are relatively cheap to modify into a simple but robust tool for partial soil inversion. In this demonstration one-way disc ploughing was compared to rotary spading, a proven amelioration option for repellent sands and a number of deep ripping approaches, including some of the newer very deep rippers.


Tactical nitrogen decisions for wheat

Summit’s In-Season Nitrogen Calculator aimed to calculate a precise N rate to maximize yield potential of a paddock where a crop is starting to run into N limitations, using NDVI as a real-time growth measurement. It was designed to utilise comparisons between crop growth without N limitations beside paddock practice to determine optimal N application for yield and returns.

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Control of loose smut, spot form net blotch, powdery mildew and leaf rust through soil and foliar fungicides in Bass barley

This trial aimed to evaluate early foliar disease suppression of soil applied fungicides, compare early soil disease control to a foliar only strategy, compare efficacy of different foliar fungicides on yield at a ~Z31 and Z39 applications as well as comparative of seed treatments.

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Herbicide options for annual legume pastures

A growing number of farmers in the West Midlands region use Serradella (and other aerial seeded annual legume pastures) in the pasture phase of their rotation. Controlling weeds in Serradella pastures requires the use of different herbicides and other management strategies (e.g. weed wiping) when compared to traditional subclover based pastures.

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GRDC: Investigating double break (stacked rotation) options

This project investigates the use of double break crops to increase the yield of subsequent wheat crops in the Kwinana East and West port zones of the WA grain growing region through the use of field experimentation.

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Improving timely emergence of crops using seed delivery systems

The aim of this study was to investigate the impact of paired and single seeding configurations on the timely emergence of crops. While the use of paired row seeding configurations has been popular and well adopted among growers in recent years, there is little independent data to quantify the benefit of paired row seeding configurations on the timely emergence of crops over a range of seeding depths and soil types.

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GRDC: Legume demonstrations for reliable profitability in the Western Region

The trial investigated the profitability of multiple types of legume crops to determine which legumes will suit different areas and rotation systems. This demonstration site was part of a state-wide project, led by the Liebe Group across the Kwinana West, Kwinana East and Geraldton port zones.

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