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Optimising Fertiliser Use with VRT in the Murray Plains
Improving Soil Performance with Variable Rate Technology in the Murray Plains
Lowbank Soil Amelioration Trials
On-Farm Soil Amelioration Trials in Lowbank – Improving Marginal Soils for Sustainable Cropping
Soil technology and innovation focus – Bowhill
Inclusion ripping and organic matter trials improved crop growth and soil health on sandy soils in Bowhill.
Q99. How quickly does nitrogen volatilise from applied urea?
Nitrogen from urea can begin volatilising within 24–48 hours after dissolving, especially under warm, windy conditions and on wet soils that are drying.
Q97. How much nitrogen does organic matter release over the season, and how quickly does it become available?
Organic matter can release around 39 kg/ha of nitrogen per year under typical conditions, with availability depending on temperature, moisture, and microbial activity.
Q95. How much nitrogen does a green manure (vetch) crop contribute to the soil?
Green manure vetch crops can contribute around 154 kg/ha of nitrogen to the soil, with fixation strongly linked to biomass production and rainfall.
Q94. How does my fertiliser strategy change after the soil is mechanically ameliorated? i.e. plozza, spading, etc?
After mechanical soil amelioration, fertiliser needs may rise due to higher yield potential and nutrient redistribution, so updated soil testing is essential to guide nitrogen,
Q93. How can I use a yield map to make a phosphorus recommendation?
Use yield maps to calculate phosphorus removal and set replacement rates or create variable rate maps, but always consider soil tests and PBI to fine-tune
Q92. How much nutrient is exported from the paddock after a bumper year?
A bumper grain harvest removes significant nutrients from the soil – e.g. wheat removes ~20 kg N/t and canola ~40 kg N/t – so adjusting
Q80. Can I fully rehabilitate a seep area (i.e. crop it like the rest of the paddock) and how long will it take?
Yes, Mallee seeps can be fully rehabilitated for cropping, but success and timeframes – typically 3-5 years – depend on salinity levels, seep severity, and
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