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Are you stuck in the “lime every few years” cycle?
Soil scientist Phil Mulvey joins me in the vineyard to unpack how pH really works — from aluminium toxicity and CEC (cation exchange capacity) to buffering and why plant diversity can stabilise pH and rebuild soil structure. We compare lime vs a biological approach (multi-species covers, legumes, deep-rooters) and preview a follow-up on fungal inoculation.
What you’ll learn:
Why pH ≈ 6–6.5 maximises nutrient availability
The 5.2 pH aluminium toxicity cliff and shallow rootsHow CEC and organic matter “glues” create aggregation, infiltration & drought resilience
Practical seed-mix ideas for vineyards & grazing to buffer pH biologically
📍 Location: Australia (vineyard)🌱
Seed sources mentioned: Ardent Seeds (TAS) / ardentseeds mixes (mid-row & under-vine)
👤 Guest: Soil scientist Phil Mulvey
🚜 Tractor cameo: Ferguson TEA20
Check out Tim's website for even more content: https://timthompson.ag/
Subscribe for a new video each week! New content uploaded every weekend. Tim Thomspon's Youtube Channel: @farmlearningtim
Starting at 48:10, Phil joins the BrisScience panel as they celebrate the International Year of Soils with a nitty gritty discussion on: ‘Digging deeper…can Australian soils really feed the world?’
Watch on Youtube
Want to restore fertility, fix salinity, and rehydrate your landscape? Phil Mulvey joins regenerative farming legend Martin Royds at Jillamatong (Braidwood, NSW) to reveal practical midslope management techniques to dramatically improve water infiltration and soil health on your farm.
Watch on Youtube
In Australia and around the world, estimating carbon in soil is difficult and expensive. Measurement is considered too variable and costly and modelling is often found to be difficult to calibrate and has a large variance. Philip Mulvey joins HydroTerra's Richard Campbell to discuss soil carbon farming and the associated current challenges and progress.
Watch on Youtube
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