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EcoFarm Aotearoa

Ewan Campbell with co-host Stephen Brunton
EcoFarm Aotearoa
Latest episode

77 episodes

  • EcoFarm Aotearoa

    The Science of Epigenetics: What Happens Today Shapes Tomorrow

    02/11/2026 | 37 mins.
    What if the environment your animals are raised in influences how their genetics are expressed, and what gets passed on to the next generation?In this episode of An Eco Farmer’s Discovery, Ewan Campbell and Stephen Brunton explore the relationship between epigenetics, genetics and the environment. Starting with the Dutch Hunger Winter and the research into how nutrition and stress during pregnancy can influence the development of future generations, they discuss how the same genetic blueprint can produce different outcomes depending on the signals an organism receives from its environment.The conversation then takes these ideas onto the farm, looking at soil fertility, nutrition, electromagnetic fields (EMF), seed germination and livestock development. Ewan shares his observations from working with farms, including examples involving thistle growth, power infrastructure and EFA Guardian Rocks. They also discuss how they believe artificial electromagnetic influences may affect the signals plants and animals receive, and why they see protecting the farm environment as an important part of improving genetic expression.In this episode:- The Dutch Hunger Winter and its influence on research into epigenetics- How environmental conditions can influence gene expression without changing DNA- The relationship between maternal nutrition, pregnancy and the next generation- Why the farm environment matters when developing healthy livestock- How soil fertility and trace minerals may influence animal development- The role of electromagnetic fields (EMF) in the natural environment- The difference between natural and artificial electromagnetic influences- Ewan's observations of EMF issues on working farms- A case study involving thistle growth, power poles and farm infrastructure- How EFA Guardian Rocks are used within their farming approach- The potential influence of magnetic fields on seed germination and crop growth- Why seed origin and growing conditions matter- How farmers can think about protecting their investment in livestock genetics- Why improving the environment today could influence future generationsOur E-Book!https://www.ecofarmaotearoa.nz/download-our-ebook/Listen To An EcoFarmer’s Discovery:https://open.spotify.com/show/3wIgUUghlsKIje76E5tjBA?si=b4aa009579a34ac1⁠
  • EcoFarm Aotearoa

    Are We Measuring the Right Things in Agriculture?

    23/10/2026 | 39 mins.
    How much nitrogen does your next crop really need, and where is that nitrogen coming from?

    In this episode of An Eco Farmer’s Discovery, Ewan Campbell and Stephen Brunton revisit a discussion about nitrogen, crop residues and soil biology after a farmer challenges their previous claims with detailed production figures. Using the farmer’s wheat and oat rotation as a case study, they work through the numbers, explore the potential role of crop residues in building soil organic matter, and explain why they believe farmers need to understand what is happening beneath the surface.

    The conversation looks at soil testing, carbon levels, nutrient availability and the conditions needed for soil biology to function. They also revisit an example soil test from Taranaki to discuss nutrient imbalances, aluminium, boron and calcium, alongside the importance of measuring changes over time. The episode expands into the relationship between soil organic matter, farm profitability, crop quality and nutrient density, with examples from farming experiences and the practical lessons that can be learned by testing, observing and measuring.

    In this episode:
    A farmer’s challenge to EcoFarm’s claims about nitrogen and soil biology

    Breaking down the nitrogen requirements of a wheat and oat rotation

    How crop straw could contribute to soil organic matter and nitrogen cycling

    Why the starting condition of your soil matters

    Understanding soil carbon, humus and organic matter

    How soil testing can reveal nutrient imbalances and limiting factors

    The relationship between aluminium, boron, calcium and other nutrients

    Why crop residues need the right conditions for biological decomposition

    What earthworms, fungi and cyanobacteria contribute to soil processes

    How to test and measure changes in soil over time

    The potential relationship between soil organic carbon and farm profitability

    Why crop quality, nutrient density and storage life deserve attention

    Lessons from a long-term soil improvement example in Taranaki

    Why farmers should measure results rather than rely on assumptions
    Our E-Book!https://www.ecofarmaotearoa.nz/download-our-ebook/Listen To An EcoFarmer’s Discovery:https://open.spotify.com/show/3wIgUUghlsKIje76E5tjBA?si=b4aa009579a34ac1⁠
  • EcoFarm Aotearoa

    More Fertiliser Won't Fix Your Soil

    14/10/2026 | 50 mins.
    What if the problem with your pasture, garden or lifestyle block isn't a lack of nutrients, but the fact that your soil can't access the nutrients already there?

    In this episode of An Eco Farmer's Discovery, Stephen Brunton sits down with EcoFarm soil consultant Campbell Page to explore how soil testing can reveal what's really happening beneath the surface. From identifying nutrient deficiencies and understanding soil biology to recognising what weeds might be telling you, Campbell explains why it's important to investigate the root cause of a problem rather than simply applying more fertiliser.

    Whether you're managing a commercial farm, running a lifestyle block, growing your own vegetables or raising animals, understanding your soil can help you make more informed decisions about fertility, pasture health and food quality. The conversation also explores the relationship between soil chemistry and biology, the role of nutrient availability, and how a more targeted approach could help reduce unnecessary fertiliser spending.

    In this episode:
    Meet Campbell Page, EcoFarm's soil consultant for DIY soil testing clients

    How soil testing identifies nutrient levels and limiting factors

    The difference between total nutrients and nutrients available to plants

    What soil structure and flocculation mean for air, water and biology

    How weeds like dock, gorse and thistles can provide clues about soil conditions

    Why the same soil principles apply to lifestyle blocks and commercial farms

    How soil chemistry and biology work together to cycle nutrients

    Why applying more fertiliser may not address the underlying problem

    How nutrient availability can influence pasture growth and animal health

    When to carry out soil and herbage testing

    How targeted nutrient applications can help address specific deficiencies

    Where to start if you want to improve your own soil
  • EcoFarm Aotearoa

    Your Soil Could Be Worth MILLIONS

    07/10/2026 | 26 mins.
    What if the biggest financial asset on your farm is already sitting in the soil? In this episode, Scott Gordon joins the conversation to break down the financial side of soil fertility, looking at the value of minerals locked up in the soil, the cost of unlocking them, and how understanding your soil could change the way you assess farm value, productivity and return on investment. We also explore the idea of treating soil like a bank account, where better fertility management can turn an underperforming asset into productive cash flow.

    In this episode:
    The hidden financial value of minerals in your soil

    Why a soil test should be part of assessing a farm's value

    The "current account" and "term deposit" analogy for soil fertility

    How locked-up nutrients can limit farm productivity

    Why total and available nutrients need to be looked at together

    The potential financial impact of fixing limiting factors

    How soil fertility can affect animal health and production

    Why bankers could benefit from understanding soil productivity

    Using evidence and soil data to make better farm decisions

    How improving soil can create more productive land without buying more hectares

    The real cost of doing nothing with the nutrients already in your soil

    Our E-Book!https://www.ecofarmaotearoa.nz/download-our-ebook/Listen To An EcoFarmer’s Discovery:https://open.spotify.com/show/3wIgUUghlsKIje76E5tjBA?si=b4aa009579a34ac1⁠
  • EcoFarm Aotearoa

    What Your Herbage Test Is Really Telling You

    29/09/2026 | 41 mins.
    Herbage testing can reveal a lot about what is happening in your soil, but timing and the right combination of tests are crucial. In this episode, Ewan and the team look at why mid to late spring can be such an important window for herbage testing in New Zealand, when multiple pasture species are actively growing and minerals can be better represented.
    The conversation explores the relationship between soil tests, herbage tests and soil biology, including trace minerals such as cobalt, selenium, nickel, boron and iodine. They also work through an anonymised farm example, looking at nitrogen, potassium, calcium, silicon, aluminium and other minerals to understand what the numbers may be showing about the wider soil system.
    They also revisit the response to the previous cropping episode, discussing how soil preparation, biology and nutrient cycling fit together, why plants such as wild turnip may be indicators of underlying soil conditions, and why soil testing should be the starting point when trying to understand what is limiting a farm.

    In this episode:
    Why mid to late spring is an important time for herbage testing

    How different pasture species can affect the minerals showing in a herbage test

    Why some trace minerals are difficult to assess accurately through soil testing alone

    How herbage testing can provide an indication of soil biology and mineral availability

    The relationship between nickel, nitrogen and zinc

    Why silicon and aluminium are important when looking at weeds and soil conditions

    How soil tests and herbage tests can be used together

    What an anonymized farm herbage test can reveal about soil fertility

    Why soil testing should be the starting point when identifying limiting factors

    How soil biology can contribute to nutrient cycling after cropping

    What pasture plants and weeds may be telling you about the condition of the soil

    Why accuracy and observation matter when making soil fertility decisions
More Nature podcasts
About EcoFarm Aotearoa
From paddock to podcast, EcoFarm Aotearoa showcases Ewan Campbell, a respected name in NZ farming, known for turning good science into better practice. With co-host Stephen Brunton, Ewan unpacks his audiobook and the big issues: nitrate and water quality, soil biology, mineral balance, genetics, pasture growth, animal health, and profitability. Real stories, clear takeaways—ready for the ute, cowshed, or tractor. Notes & links: efa.nz
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