The Carbon Trap: Why Pasture Renewal Is Costing You More Than You Think

The Carbon Trap: Why Pasture Renewal Is Costing You More Than You Think

The EcoFarm Aotearoa Podcast (Ep. 9)

Most farmers know carbon is important, but few realise just how fast it can vanish or what’s really driving the losses. In this episode, Stephen and Ewan break down a Grasslands Conference presentation by soil scientist Louis Schipper, and compare his findings with what’s actually happening on real farms.

From pasture renewal to maize cropping, chemical sprays to root systems, this episode takes you far beyond the theory. As Ewan explains, the numbers don’t lie, but the interpretation often does. Behind every carbon crash is a deeper biological story, and ignoring it costs farmers thousands in fertility, grazing, and long-term soil health.

Together, Stephen and Ewan unpack the hard science, challenge long-held assumptions, and reveal why cyanobacteria are the missing link in New Zealand’s carbon cycle. Once you understand how soil biology really works, everything changes: carbon stabilises, nutrients rise, organic matter builds, and paddocks recover faster than anyone expected.

We discuss:
• Why pasture renewal causes huge carbon losses — and why recovery often never happens
• How chemical sprays wipe out cyanobacteria and crash soil fertility
• Why maize looks great the first year but drains carbon for years afterwards
• The surprising role cyanobacteria play in nitrogen, phosphorus, and sulphur availability
• Practical steps Ewan uses to lift organic carbon by 1–2% a year without expensive inputs

With clarity, humour, and decades of hands-on fieldwork, Stephen and Ewan translate complex soil science into practical solutions any farmer can use. This episode connects research, real soil tests, and on-farm experience into a roadmap for restoring soil carbon the natural way.

Hosted by: Stephen Brunton & Ewan Campbell
Powered by: EcoFarm Aotearoa – ⁠www.efa.nz⁠

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