Sam Knowlton Profile picture
Agronomy consultant to leading ag and food companies – specialty crops, coffee, cacao, agroforestry. @soilsymbiotics & @somafarmgroup
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Apr 7 17 tweets 4 min read
The weather patterns that coffee farmers relied on for generations are breaking down.

While global climate change takes the blame, in reality it’s largely a self inflicted cycle of ecological degradation resulting from farming practices.

A look at the problem and solutions: 🧵 Image The numbers tell a sobering story:

37% of the world’s coffee grows on former forest land. The industry has cleared over 2.5 million hectares—nearly four times the size of Delaware. Image
Mar 28 11 tweets 3 min read
After $1B invested over 15 years, the Gates-backed Alliance for a Green Revolution in Africa (AGRA) promised agricultural prosperity.

Instead, AGRA delivered ecological damage, farmer debt, and increased hunger, leaving target countries worse off than before the program began🧵 Image AGRA began in 2006 with bold targets to 2x yields and incomes for 30M smallholder farmers while cutting food insecurity in half by 2020.

Evaluations reveal what farmers already knew—AGRA did not meet its headline goal even after reducing its target from 30M to just 9M farmers.
Mar 25 11 tweets 2 min read
A new study claims grass-fed beef is as carbon-intensive as industrial beef.

This conclusion relies on a narrow, linear analysis that misses the complex ecological reality of grazing systems.

Here's why this claim is wrong: Image Well-managed grazing dramatically enhances biodiversity, builds healthy, resilient soils, supports water cycles, and contributes to carbon storage both below and above ground.

These critical ecological functions are largely overlooked in the study's limited analysis.
Mar 21 11 tweets 2 min read
Our taste buds and sense of smell evolved to decode the chemical language of plants.

The compounds that create flavor in whole foods are often the exact same molecules that benefit our health, a fundamental relationship that modern food processing has profoundly disrupted. 🧵 Image The human nose can distinguish trillions of different smells with just 400 types of scent receptors working in combination.

This system evolved specifically to help us evaluate which plants were nutritious and which might be toxic.
Mar 17 13 tweets 2 min read
History often frames the Irish Potato Famine as a simple crop failure story. A closer look tells a different tale:

Ireland maintained net food exports while 1 million starved—showing how institutional architecture, not technological limitation, created catastrophe... 🧵 Image Ireland wasn't technologically backward during the famine years.

It existed right alongside England during the British Agricultural Revolution, a time when crop rotation boosted farm yields by 50% and selective breeding dramatically improved livestock productivity.
Mar 12 7 tweets 2 min read
Microplastic pollution is disrupting photosynthesis across ecosystems and cropland, threatening our food security in ways we've drastically underestimated.

These invisible particles degrade our soils and undermine the biological foundation of our food system...🧵 Image Microplastics physically block sunlight on leaf surfaces, disrupt internal nutrient transport pathways, release adsorbed toxins into plant tissues, and induce oxidative stress—collectively degrading photosynthetic efficiency at cellular levels. Image
Mar 11 12 tweets 3 min read
Pesticides persist in soils for decades, not months.

A study of 100 fields shows even after 20 years of organic management, soils contain up to 16 different pesticide compounds—disrupting microbial communities and undermining productivity long after application stops... 🧵 Image Fields were analyzed across the agricultural spectrum—from conventional operations to established organic farms.

Certified organic soils contained significant levels of atrazine, chloridazon, and carbendazim (a compound linked to declining reproductive health). Image
Mar 10 12 tweets 2 min read
Biological Transmutation challenges a fundamental axiom of science: the immutability of elements.

Evidence suggests living systems can change one element to an entirely different one at ordinary temperatures—forcing us to reimagine the basic rules of matter itself... 🧵 Image First documented systematically by Louis Kervran, biological transmutation suggests organisms possess biochemical pathways capable of rearranging nucleons at low energy thresholds, effectively converting one element to another through non-nuclear processes.
Mar 7 14 tweets 3 min read
Farmers worldwide spend billions annually on potassium fertilizers that may actually REDUCE crop access to this essential nutrient.

This counterintuitive finding from University of Illinois research challenges decades of conventional agricultural practice.

A quick summary: Image The "potassium paradox" occurs when potassium chloride (KCl) fertilizer triggers soil mechanisms that lock away rather than supply potassium

Meanwhile, unfertilized soils often show INCREASING potassium availability over time

Here's how it works:
Mar 5 11 tweets 2 min read
The story that synthetic nitrogen represents a technological triumph that saved the world from hunger mischaracterizes its industrial origins.

These fertilizers weren't designed for optimal crop nutrition, they emerged from repurposed wartime chemical manufacturing...🧵 Image Haber-Bosch wasn't developed to feed populations, it was engineered to manufacture explosives.

After WWII, the chemical industry faced massive production overcapacity and strategically pivoted toward agriculture, creating a new market for existing industrial infrastructure.
Mar 4 12 tweets 2 min read
Soil functions as a complex electrochemical matrix where electron transfer processes govern nutrient availability, microbial activity, and plant physiological responses.

Understanding and managing this electrical dimension represents the frontier of agricultural science... 🧵 Image Soil redox potential measures the availability of electrons—essentially quantifying your soil's "electrical charge"—and ranges from highly oxidized (+600 mV) to highly reduced (-300 mV).

This invisible electrical gradient determines which nutrients plants can access.
Feb 28 9 tweets 2 min read
Since 1900, we've lost 75% of our global food crop varieties—the most rapid extinction of agricultural genetics in human history

Meanwhile, the US lost 93% of vegetable varieties between 1903-1983

This is one the greatest threats to agriculture and is rarely talked about 🧵 Image The mechanisms of loss are clear.

High-yield varieties displaced 85% of traditional landraces post-1960.

Monocultures now dominate 80% of global cropland for just 12 plant species.

The 1980 Bayh-Dole Act enabled 4 firms to control 67% of commercial seeds today.
Feb 23 7 tweets 2 min read
Soil microbes don’t just coexist—they communicate

Through quorum sensing, bacteria and fungi synchronize, turning collective actions on or off depending on population density

This hidden system drives nutrient cycling, disease suppression, and drought resilience

How it works: Image Quorum sensing relies on signaling molecules—like acyl-homoserine lactones (AHLs) in bacteria.

As microbial populations grow, these molecules build up. Once they reach a critical threshold, they activate group behaviors:

Biofilm formation
Antibiotic production
Nutrient release
Feb 21 8 tweets 2 min read
Glyphosate, the world’s most widely used herbicide, is unequivocally linked to higher crop disease severity.

Research shows this isn’t coincidental—it’s tied to biochemical and ecological shifts in herbicide-treated fields.

Here's how it works: Image Glyphosate suppresses beneficial soil bacteria (Pseudomonas, Bacillus) by 40–60% while promoting pathogenic fungi like Fusarium.

In glyphosate-resistant soybeans, root infections by Fusarium virguliforme triple post-application, directly correlating with yield loss. Image
Jan 30 7 tweets 2 min read
Agricultural land grant universities were founded in 1862 to support regional food systems. These institutions were bastions of knowledge and innovation in service of public good.

They've since been hijacked by industrial agriculture to serve an entirely different purpose... Image In 2009, corporations invested $822M in land grants compared to $645M from USDA

By 2010, private funding provided 25% of agricultural research funding.

Some institutions now get more than half their funding from private industry. Image
Dec 18, 2024 11 tweets 3 min read
Two decades ago, researchers started an experiment that would challenge the prevailing scientific understanding of plant communities.

While modern agriculture treats diversity as inefficient, the Jena Experiment proved the opposite: complexity is the key to resilience. Image The setup was simple but groundbreaking.

82 grassland plots, ranging from monocultures to combinations of 60 species, monitored for over 20 years.

What they discovered would expose the fundamental flaws in how we think about agricultural systems.
Dec 12, 2024 6 tweets 2 min read
While industrial agriculture spent billions breeding corn varieties that require MORE fertilizer a little-known plant geneticist has done the opposite.

Dr. Walter Goldstein breeds corn varieties that literally feed themselves.

Here’s how his discoveries can reshape modern ag. Image In studying corn genetics, Goldstein made a revelatory discovery – Modern corn had in large part lost its ability to partner with soil microbes.

But through careful breeding, he could bring this ancient ability back.
Dec 9, 2024 10 tweets 3 min read
In 1935, a peculiar Austrian forester made a claim that seemed impossible:

He could make water flow uphill without any external power source.

Scientists called him a fraud.

The Nazi regime tried to weaponize his discoveries.

Today, modern physics is proving he was right about almost everything.

This is the story of Viktor Schauberger, the "Water Wizard" who saw what everyone else missed:Image Schauberger spent countless nights observing trout in mountain streams. He noticed they could remain motionless in rapid currents and suddenly dart upstream with explosive speed.

This defied known physics. But he saw what others missed: natural vortices. Image
Jan 5, 2024 7 tweets 2 min read
Revered by some and unknown to many, breadfruit is one of the most promising yet underutilized perennial staple crops in the tropics

A single breadfruit tree can produce 500 pounds of nutritionally dense fruit seasonally for decades.

The case for a breadfruit resurgence: Image Breadfruit is a species of tree in the Moraceae family, native to new New Guinea. It initially spread to Oceania and is now found throughout the tropics.

Known as 'Ulu, It is also one of the celebrated "canoe plants" brought to Hawaii by ancient Polynesians.
Nov 29, 2023 11 tweets 3 min read
Each year, we lose 3–4 million hectares of tropical forest, 90% of which is attributed to agriculture.

Productive agriculture and healthy forest ecosystems are not mutually exclusive.

Take the example of Ernst Gotsch:
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Ernst Gotsch is a Swiss-trained agronomist who settled in the northeast of Brazil after years of tropical agriculture research stints.

He started with 120 hectares of former farmland so degraded that the Ministry of Agriculture deemed it unsuitable for any type of farming. Image
Nov 7, 2023 6 tweets 2 min read
Modern farms rely heavily on plastic.

Irrigation materials, plastic mulches, row covers, etc., contribute to a steady stream of microplastic deposits in the soil.

Microplastics serve as a vector for transmitting pathogenic and antibiotic-resistant bacteria into the food system Image Plastics effectively adsorb chemical substances. Chemicals like antimicrobial pesticides and heavy metals, which would otherwise move through the soil, stick to microplastics. Meanwhile, bacteria and other soil microbes preferentially colonize the surface of these microplastics. Image