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Andrew McGuire

@agronomistag

Views of an agronomist on soil, farming, and science. Evidence-based agriculture. Washington State University Extension. https://t.co/RZ11P3ozYm Same @ on X.

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Latest posts by Andrew McGuire @agronomistag

This is interesting but doesn't add N to the system so is unlikely to reduce N use. Farmers will fertilize and take advantage of the yield gains, just as with any breeding gain.

10.03.2026 16:03 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Can increased cover crop diversity increase root-soil binding and reduce soil loss during overland flow? Although cover crops can potentially improve on-farm soil and water management to reduce erosion, their ability to bind soil and whether multi-species…

Again, plant diversity is not the source of benefits.

"The presence of individual species, rather than diversity per se, determined the soil binding capacity of the system."
Open access.
www.sciencedirect.com/science/arti...

09.03.2026 22:06 πŸ‘ 4 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0

I don’t have a deeper message other than: Food and farming issues almost always involve tradeoffs. I wish people would grapple with the tradeoffs rather than retreat to vibes and ideology. END

05.03.2026 19:49 πŸ‘ 11 πŸ” 1 πŸ’¬ 3 πŸ“Œ 0
Venn diagram showing nearly full overlap between 1) Organic, 2) Agroecology, and 3) Regenerative agriculture.

Venn diagram showing nearly full overlap between 1) Organic, 2) Agroecology, and 3) Regenerative agriculture.

Why do organic, agroecology, and regenerative ag all look so similar?

Because they're built on the same foundation: pop ecology; notions about nature that feel intuitive but don't hold up to scrutiny.

csanr.wsu.edu/pop-ecology/

05.03.2026 00:38 πŸ‘ 9 πŸ” 0 πŸ’¬ 2 πŸ“Œ 1

Me too.

27.02.2026 22:42 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
Diagram showing how plant species identity is much less important for structuring soil bacterial communities than pH, organic carbon, and oxygen levels.

Diagram showing how plant species identity is much less important for structuring soil bacterial communities than pH, organic carbon, and oxygen levels.

One of the many interesting points. Look how far down plant species is in terms of structuring soil bacterial communities.

27.02.2026 21:16 πŸ‘ 5 πŸ” 0 πŸ’¬ 4 πŸ“Œ 0
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Embracing the unknown: disentangling the complexities of the soil microbiome - Nature Reviews Microbiology Soil contains a vast diversity of microorganisms that can directly or indirectly modulate soil processes and terrestrial ecosystems. In this Review, Fierer summarizes the challenges in characterizing ...

This is one of the most clear‑headed soil microbiome papers I’ve read. No hype, just solid science. You might be shocked by how much we still don’t know about soils.
By @noahfierer.bsky.social
Unfortunately, not open access. www.nature.com/articles/nrm...

27.02.2026 21:16 πŸ‘ 18 πŸ” 7 πŸ’¬ 2 πŸ“Œ 0

Everything after conversion = organic, sustainable, regenerative, biodynamic, permaculture, and anything else we do after conversion, except for returning it to nature.

27.02.2026 17:19 πŸ‘ 4 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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How imperfect can land sparing be before land sharing is more favourable for wild species? Our results confirm that real-world difficulties in implementing land sparing will have significant impacts on biodiversity. They also underscore the need for strategies which explicitly link yield i...

Imperfect land sparing, with only 30% of land spared devoted to conservation is still better than land sharing. Why? Because the worst thing ag does to nature is convert it to cropland. Everything after conversion is insignificant in comparison.
besjournals.onlinelibrary.wiley.com/doi/10.1111/...

27.02.2026 17:19 πŸ‘ 7 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
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How Pop Ecology Misleads Agriculture Romanticized β€œpop ecology” oversimplifies nature and leads to costly mistakes in real-world crop management.

"Nature knows best" sounds wise. But we invented farming because nature didn't know best for growing crops. Pop ecology's tradeoff-free farming doesn't hold up to scrutiny. csanr.wsu.edu/pop-ecology/

26.02.2026 03:31 πŸ‘ 5 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0

As I posted on the other site: Important nuance on regenerative agriculture: livestock-only systems can meet far more regen‑ag goals than crop-producing operations. We should treat them as distinct when evaluating outcomes.
With crop-only systems, best bet=no-till+cover crops+high residue cash crops

26.02.2026 03:30 πŸ‘ 3 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
Graph of caterpillar population over time showing four spikes with levels near zero in between, from 1985-2025.

Graph of caterpillar population over time showing four spikes with levels near zero in between, from 1985-2025.

3. Nature isn't "balanced."
Real pest dynamics look like spikes, not balance.
Even in systems with successful biocontrol, stable pest populations are rare.
Weather, moisture, and resource limits often drive outcomes.
Not pop ecology but the ecology of reality.

25.02.2026 19:47 πŸ‘ 10 πŸ” 1 πŸ’¬ 1 πŸ“Œ 0
Side-by-side photos of two cover crops from above, one with many species and one a monoculture (one species).

Side-by-side photos of two cover crops from above, one with many species and one a monoculture (one species).

2. More biodiversity isn’t always better.
A biodiverse 12‑way cover crop mix won’t automatically beat a simple, well‑chosen single species.
Same with intercroppingβ€”sometimes it helps, sometimes it doesn’t.
What matters is the right plant doing the right job for your field.

25.02.2026 19:47 πŸ‘ 8 πŸ” 1 πŸ’¬ 1 πŸ“Œ 0
Photo of a combine harvesting wheat and loading it into a wagon for export out of the field.

Photo of a combine harvesting wheat and loading it into a wagon for export out of the field.

1. Nutrients don’t magically recycle on a farm.
Nature can keep nutrients in the system because nothing leaves. But when we haul grain or hay off the field, those nutrients leave too.
If we don’t replace them with fertilizer, manure, etc., we mine the soil in the long-term.

25.02.2026 19:47 πŸ‘ 15 πŸ” 1 πŸ’¬ 1 πŸ“Œ 0
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How Pop Ecology Misleads Agriculture Romanticized β€œpop ecology” oversimplifies nature and leads to costly mistakes in real-world crop management.

Pop ecology gives us appealing slogansβ€”β€œnature knows best,” β€œthe balance of nature”—but fails to reflect reality and so misleads agriculture. Here's what the ecology of reality actually tells us.
My latest... csanr.wsu.edu/pop-ecology/

25.02.2026 19:47 πŸ‘ 94 πŸ” 32 πŸ’¬ 1 πŸ“Œ 3
Combine harvesting wheat, loading into wagon. Photo from above.

Combine harvesting wheat, loading into wagon. Photo from above.

1. Nutrients don’t magically recycle on a farm.
Nature can keep nutrients in the system because nothing leaves. But when we haul grain or hay off the field, those nutrients leave too.
If we don’t replace them with fertilizer, manure, etc., we mine the soil in the long-term.

25.02.2026 19:42 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Not even any potatoes.

24.02.2026 15:48 πŸ‘ 4 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
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Sorry, but more sustainable farming isn’t more natural farming. It’s farming that doesn’t overrun so much of the earth. That means higher-yield farming that makes more food per acre, so it doesn’t need so many acres to make food.

23.02.2026 15:32 πŸ‘ 24 πŸ” 7 πŸ’¬ 2 πŸ“Œ 0

Journalist challenge: Use β€œMachine Learning” when you mean machine learning and β€œLLM” when you mean LLM. Ditch β€œAI” as a catch-all term, it’s not useful for readers and it helps companies trying to confuse the public by obscuring the roles played by different technologies. πŸ§ͺ

22.11.2025 16:50 πŸ‘ 3710 πŸ” 1372 πŸ’¬ 58 πŸ“Œ 128

The same in soils, and just like the probiotics, farmers are applying microbes to the soil to fix them, but only those microbes that can be mass produced cheaply and store well.

09.02.2026 20:18 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

Much of this applies to the nonsense I see about and sometimes within agriculture.

06.02.2026 20:48 πŸ‘ 3 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

You're a step above the toilet - hold on to that position through the teenage years and you'll be golden.

29.01.2026 23:10 πŸ‘ 3 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0

It's refreshing to see a scientist ask for comments and critique of their own work on social media. This is how science advances.

29.01.2026 23:09 πŸ‘ 4 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

What to make of this?
"Seventy per cent of the observed significant effects on
the diversity of bacterial gene groups and 84% of the effects on fungal gene groups were positive."

29.01.2026 15:48 πŸ‘ 0 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0
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Common Ground: A Narrow Organic Vision of Regenerative Agriculture The film "Common Ground" promotes a narrow, organic-only vision of regenerative agriculture, relying on anecdotes while ignoring scientific nuance.

I agree.
csanr.wsu.edu/common-groun...

27.01.2026 21:14 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

I have not heard of anyone planning on losing glyphosate, so it will be a crisis if it happens quickly. My guess is that if it goes away, it will probably be for homeowners first, then phased out for farming over time.

20.01.2026 19:07 πŸ‘ 1 πŸ” 0 πŸ’¬ 0 πŸ“Œ 0

There are definitely alternative herbicides, but not good ones; more toxic, more expensive, etc.

Glyphosate was a unicorn among herbicides, but we have overused it and now are litigating it out of use.

18.01.2026 17:26 πŸ‘ 2 πŸ” 0 πŸ’¬ 1 πŸ“Œ 0
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Do diverse cover crop mixtures perform better than monocultures? A systematic review Multi-species cover crop mixtures have been increasing in popularity. It has been hypothesized these mixtures produce more biomass, suppress more weeds, scavenge more N, conserve more soil water, sti...

Here's the open access paper that this was partly based on. acsess.onlinelibrary.wiley.com/doi/10.1002/...

16.01.2026 16:43 πŸ‘ 2 πŸ” 1 πŸ’¬ 0 πŸ“Œ 0
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Cover Crop Mixtures vs. Monocultures: What the Research Shows Meeting future food demand without expanding farmland is a key challenge, and cover crops can help. This publication summarizes research comparing diverse vs. single-species cover crop systems to supp...

New Extension publication: Cover Crop Mixtures vs. Monocultures: What the Research Shows.
pubs.extension.wsu.edu/product/cove...

16.01.2026 16:43 πŸ‘ 7 πŸ” 1 πŸ’¬ 2 πŸ“Œ 0
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The Clock Is Ticking for Glyphosate Decisions from Supreme Court, EPA, and State Legislatures Expected in 2026

What will happen to glyphosate? Nice report.
www.breakthroughjournal.org/p/the-clock-...

16.01.2026 16:38 πŸ‘ 3 πŸ” 2 πŸ’¬ 1 πŸ“Œ 0