What Cuba showed us —
both success and failure.

So far, this series has built up, in order:

• Economics (the supply constraint and long-term price surge of phosphate fertilizer, Chapters 1–2)
• Physics (the finiteness of phosphorus resources, the limits of recycling, Chapter 2)
• Structure (the economic collapse of conventional farming, Chapter 3)
• Stance (a realistic position that avoids the three extremes, Chapter 4)
• Biology (mycorrhizal fungi, PSB, and the liquid carbon pathway, Chapter 5)
• Atmosphere (CO2 as a tailwind, Chapter 6)
• Implementation (a three-tier classification of mechanizable crops, regeneration of abandoned farmland, Chapter 7)
• Operating principles (no-till, no-weeding, saved seeds, Chapter 8)

But all of these are "untested designs in Japan."

"Did a country whose chemical fertilizer suddenly stopped arriving really survive on this design?"

There is one country that holds an answer to this question at the national scale. Cuba.

9.1 Why Cuba Comes Last

From 1989 to 1991, the collapse of the Soviet Union and the disappearance of the socialist bloc instantly destroyed Cuba's trade structure. Oil imports fell by 50%, chemical fertilizer, pesticides, and other input supplies plummeted by 70%, and food imports fell by 50%. Between 1989 and 1991, Cuba's gross domestic product (GDP) shrank by 25%.

This is a nationwide supply shock with almost the same structure as the post-2027 supply constraints this series is discussing. The only difference is that the collapse of the Soviet Union was caused by external political change, whereas what Japan now faces will be a structural process driven by a triple constraint of geopolitics, physics, and economics.

Cuba is the only nationwide case study that tests the hypothesis of this series.

This chapter sets out as honestly as possible what Cuba succeeded at, what it failed at, and what it could not avoid. It does not subscribe to the romanticization of Cuba in some permaculture circles ("Cuba succeeded"), nor to the dismissal of Cuba as just another "failure of socialism." Between those two readings lies a structural lesson Japan should learn.

9.2 Pre-Revolutionary Vulnerability and the Dependency Structure Under the Soviet System

Before the 1959 revolution, Cuba's land tenure system was dominated by the latifundia (large estate) system — its origins in the Spanish colonial era — under which land was concentrated in the hands of a small group of landowners and foreign capital (chiefly U.S.). The domestic economy was excessively dependent on monoculture and export of sugar [source: Cuba Platform, Cuban Land Reform].

The revolutionary government enacted the Agrarian Reform Law twice, in 1959 and 1963, dismantling the large estates and nationalizing farmland. But Cuba then joined the Council for Mutual Economic Assistance (CMEA / Comecon), and built an extremely dependent trade relationship with the socialist bloc centered on the Soviet Union: in exchange for exporting sugar and other goods on terms more favorable than international market prices, it imported cheap oil, machinery, chemical fertilizer, pesticides, and even the food for domestic consumption itself.

As a result, Cuban agriculture was transformed into an energy-intensive "classical model" (Green Revolution-type agriculture) that consumed more than 1 million tons of synthetic fertilizer and up to 35,000 tons of herbicides and pesticides per year.

Contrary to the ideals of the revolution, Cuba's food security was structurally embedded deep in foreign dependence. It is extremely similar in shape to the "import-dependent structure of Japan's fertilizer, fuel, and food" that this series discussed in Chapters 1 and 2.

9.3 The Special Period — A Nationwide Supply Shock

The early-1990s collapse of the Soviet Union and disappearance of the socialist bloc shattered this trade structure in an instant.

• GDP: −25% between 1989 and 1991
• Oil imports: −50% (fuel supply ran dry)
• Chemical fertilizer and pesticides: −70%
• Total food imports: −50%

Fidel Castro entered a national crisis mode he called the "Special Period in Peacetime" [source: Echemi, Roland Berger-related, Eco-Business, IFPRI, etc., and references cited in the source PDF].

Immediate Damage to Health and Nutrition

The crisis cruelly hit the population's health and standard of living straight away.

In addition, the Cuban Democracy Act (Torricelli Act) enacted by the United States in 1992, and the subsequent strengthening of the embargo through the Helms-Burton Act, made it harder to procure food and medicine through third countries and foreign companies, deepening the crisis still further.

This is not a story of "successful transition." The population went through serious hunger. It is also a warning, for the post-2027 Japan this series has been discussing, against underestimating the "cost of transition."

The large state farms that had been completely dependent on chemical inputs, large-scale machinery, and imported fuel broke down, and output collapsed. Under these desperate conditions, the Cuban government and farmers were forced into a drastic paradigm shift away from dependence on fossil fuels and chemicals, and toward an "alternative model" — agroecology and organic agriculture — that maximized the use of unused domestic resources, traditional knowledge, and biological processes.

9.4 Land Reform and Fundamental Reorganization of Production

As the institutional precondition that made the technical transition possible, Cuba carried out a state-led dismantling of the large landholding structure and a decentralization of production organizations. Soviet-style giant state farms were extremely inefficient under conditions where chemical inputs had run dry, and a shift to more labor-intensive, environmentally adaptive, small-scale and cooperative management was unavoidable.

UBPC, CPA, CCS — Three Cooperative Forms

In 1993, the Cuban government undertook a major restructuring of the agricultural sector, breaking up the state farms it had previously managed directly into "Basic Units of Cooperative Production" (UBPC: Unidades Básicas de Producción Cooperativa). Between 1993 and 1997, about 2,856 UBPCs were created. As a result, the share of state farms in the agricultural sector dropped to 33%, and UBPCs came to account for 42%.

Empirical research has confirmed that CPAs, with their higher autonomy and land ownership, tend to show higher profitability and adaptability than UBPCs, which carry a heavier state management burden. Furthermore, the non-state sector (CCS and individual farmers, etc.) occupies only about 36% of the country's farmland but produces about 60% of the total value of agricultural output, including 59% of pork production and 56% of milk production — making it the most productive segment.

"Autonomy and ownership decide productivity" — Cuba itself has proven this through its own internal comparison. It is also a foreshadowing of the failure of food sovereignty discussed below.

Expansion of Usufruct and Decree Law 259 (2008)

Even into the 2000s, vast tracts of unused state-owned land remained idle within the country. To further reduce dependence on food imports, the Cuban government pushed forward legal arrangements aimed at putting idle land into productive use. The core piece is Decree Law 259, enacted in July 2008.

This decree grants individuals (natural persons) and legal persons usufruct over idle land managed by the state.

• Individuals who do not currently own land: applications up to 13.42 hectares
• Individuals already using land effectively: applications up to 40.26 hectares
• Term of usufruct: 10 years for natural persons (renewable for another 10 years under conditions), 25 years for legal persons (also renewable on similar terms)
• Users are required to belong to the nearest CCS and must enter into a contract with the state covering soil protection, animal-health compliance, and the conduct of legal production activity

Through this system, hundreds of thousands of new agricultural workers came into being, and small-scale farmers began cultivating diverse crops and regenerating orchards across the country.

The strategy discussed in Chapter 7 — using Japan's 98,000 hectares of abandoned farmland as a receiving capacity for regenerative agriculture — overlaps philosophically with Cuba's Decree Law 259.

9.5 Technical Shift to Agroecology — Organopónicos

Under conditions where chemical inputs had been cut off, what supported Cuban agricultural production was the practice of agroecology, mimicking and harnessing ecological processes. This practice was driven forward by two innovations: "urban agriculture" to overcome spatial constraints, and "biocontrol" to substitute for chemical pesticides.

What Are Organopónicos?

Faced with absolute food shortages, urban residents on their own initiative began clearing vacant lots, parking lots, abandoned buildings, rooftops, and back patios, and started producing food. The government recognized the potential of this grassroots movement, and in 1994 set up the "Department of Urban Agriculture" within the Ministry of Agriculture, building a national support framework that included seed supply, composting facilities, and technical guidance.

The core technique of this urban agriculture is "organopónicos." This is an intensive system in which, on barren urban land that has been paved with asphalt or concrete or where the soil has been compacted and degraded, low retaining walls (raised beds) are built out of concrete blocks, stone, or wood, and organic-rich soil, compost, and vermicompost (worm castings) brought in from outside are loaded in to grow crops.

Technical Strengths — Thoroughly Ecological Cycling

• No use of chemical fertilizers or pesticides: soil improvement via vermicomposting that uses urban food waste and livestock manure
• Crop rotation, companion planting (polyculture), and biological pest management are standard practice
• Drip irrigation is laid on the surface of the beds, and the tropical climate is leveraged to produce vegetables year-round without interruption
• Under the philosophy of "food production by the neighborhood, of the neighborhood, for the neighborhood," fresh vegetables and herbs that have been harvested are sold the same day, without transport cost or energy use, directly to local residents at the on-site outlet (punto de venta) attached to the garden, or supplied to school and hospital cafeterias
• Profit sharing: in the case of the Playa district, 80% goes back to the labor collective, 15% to the state, and 5% as a capital reserve

Scale of Production — Astonishing Growth

This is estimated to cover roughly 70 to 90% of the vegetables consumed by Cuba's urban population.

As a production model for "crops not suited to mechanization — diverse vegetables, fruit trees, fruit-bearing vegetables" discussed in Chapter 7, organopónicos are a case in which the system functioned at the national scale. Regenerating Japan's balcony gardens, community gardens, and abandoned farmland can directly reference this system as its small-scale, distributed counterpart.

9.6 CREE and Domestic Biocontrol Production

Before the Special Period, Cuba was spending about USD 80 million a year on pesticide imports, but by 1991 this budget had been cut to USD 30 million. To fill this pesticide gap, Cuba completely shifted the conceptual basis of pest management from chemical control to biological control. The production sites were the "Centers for the Reproduction of Entomophages and Entomopathogens" (CREE), established across the country.

System Characteristics of CREE

CREE are regionally distributed, small-scale (artisanal) biocontrol-agent production facilities, operated by local specialists such as university-trained technicians, supplying biocontrol agents tailored to the specific pests that local farms and cooperatives need.

• By the end of 1992, 218 CREE were in operation
• Over 15 million tons of biopesticides cumulatively during the 1990s

Key Biocontrol Agents Produced at CREE

These entomopathogens (ENMs) and natural enemies are safe — they leave no residual toxicity, are safe for the environment, humans, and livestock — and they can prevent the development of pesticide resistance in pests, which is a problem with chemical pesticides. In recent years, importance has grown still further as a national "Bioinputs program," including the production of biofertilizers (microbial communities that convert soil nutrients into plant-available forms) to substitute for chemical fertilizers, and biostimulants that enhance tolerance to stresses such as drought.

Here is a structural answer to the risk discussed in Chapter 3 — that "a single hard-to-obtain pesticide can wipe out a whole crop." Replacing dependence on a specific pesticide with regionally distributed biological control — the same design is possible in Japan.

9.7 Campesino a Campesino — Horizontal Knowledge Transfer

Behind the rapid and successful spread of agroecological practice across Cuba lay not only innovative technique, but an outstanding social and educational methodology to propagate it. That was the "Campesino a Campesino" (CAC: farmer-to-farmer) movement, led by the National Association of Small Farmers (ANAP).

How CAC Works

Whereas the conventional "Green Revolution" approach relied on top-down technical guidance from central research institutes and experts to farmers, the CAC movement is a community-based process in which farmers themselves take the lead and share knowledge and practical experience horizontally.

Without chemical fertilizer or oil, farmers visited each other's farms — through cross-visits and workshops — and taught one another:

• effective ways to apply biopesticides
• intercropping techniques for diverse crops
• methods for making compost
• nearly lost know-how of traditional animal traction (plowing with oxen and horses)

Indeed, during this period, 288,888 head of livestock were redeployed into agricultural labor as a substitute for tractors.

Result — From Monoculture to Diverse Agroecosystems

Research findings show that the CAC approach contributed not only to a major increase in production — both relative and absolute — in the smallholder sector, but also, by promoting a shift from monoculture to diverse agroecosystems, strengthened resilience to climate change, with the side effect of breaking down barriers of gender and age in agriculture.

According to one report, in the course of this transition:

Chapter 8's points — that "natural farming cannot be transmitted by books alone," and that you have to "take in trainees and successors and pass it on" — overlap completely with the lessons of the CAC movement. Technique only spreads through organized horizontal learning.

9.8 International Spread — La Vía Campesina and South-South Cooperation

The success of agroecology and the CAC movement in Cuba goes beyond a single country's survival strategy. It now functions as a reference model for sustainable agricultural transformation across the entire Global South.

The international peasant organization La Vía Campesina (LVC) positions Cuba's experience as "a source of inspiration and ideas" in opposition to agricultural models that depend on multinational agribusiness and chemicals. LVC and Cuba's ANAP have compiled a book documenting this experience, "Agroecological Revolution," and with the support of international NGOs such as Oxfam, have published it in Spanish, French, English, and other languages, spreading the methodology to smallholder organizations around the world.

A central role in the international practice of this model is played by Brazil's Landless Workers' Movement (MST). Deeply influenced by Cuba's experience, MST has dispatched "international solidarity brigades" composed of its own members to many parts of the world, in line with the principle of "internationalism (international solidarity)."

• Venezuela: Apolonio de Carvalho Brigade
• Haiti: Jean-Jacques Dessalines Brigade
• Zambia: Samora Machel Brigade

From Latin America to Africa, the Cuba-born system of farmer-to-farmer knowledge sharing has evolved into a global platform driving grassroots agroecological revolution in developing countries.

9.9 Limits — "Organic by default" and the Dual Agricultural System

Cuban agroecology, as we have seen, did indeed achieve striking results. But the view that Cuba's agricultural system as a whole is a "complete organic utopia" contains romantic exaggeration by foreign researchers and activists, and is divorced from the reality.

"Organic by default" — Coercion, Not Choice

As local farmers themselves put it, "We are not a paradise of sustainable agriculture. We are just trying to escape from a very bad agricultural model into something slightly less bad." Cuba's organic turn is, more than an environmental-ethical choice, an "Organic by default" — they had to be organic because chemicals could not be imported.

Not "organic by choice" but "organic by coercion" — this distinction matters. When the motivation depends on external conditions, the moment those conditions change, there is pressure to revert.

A Dual Agricultural System — Domestic Consumption Is Organic, Exports Are Chemical

In fact, Cuba's agricultural sector forms a "dual agricultural system," in which:

• Small-scale, fully organic farming systems deployed in cities and their outskirts
• A state-led, conventional farming system aimed at earning foreign exchange through exports (sugarcane, tobacco, etc.)

coexist.

In production sites for export and for mass domestic consumption, chemical fertilizers and pesticides are still being used to the extent resources allow. According to a Swiss-Cuban joint research project called "PERECUSO," which surveyed pesticide residues in potato-producing soils in Mayabeque Province, at least 17 active ingredients (AIs) are in use in the field, and pesticide residues such as azoxystrobin and cyproconazole have been detected.

Under tropical soil and climate conditions, the half-life (DT50) of these pesticides decomposes up to 8 times faster than in temperate-region data. Even so, it has been demonstrated that intensive spraying toward the harvest creates periods during which there is a high chronic ecotoxicological risk (hazard ratio above 1) to terrestrial ecosystems including earthworms.

FAO Crop Production Index Trajectory

Looking at the trajectory of the FAO (UN Food and Agriculture Organization) Crop Production Index (2004-2006 = 100):

But these numbers do not mean a full restoration of absolute production capacity. Because of the structural defects discussed below, Cuba remains, to this day, far from being able to meet domestic food demand.

9.10 The Failure of Food Sovereignty — Acopio and the Absence of a Market Mechanism

Despite Cuban agroecology being an outstanding case of crisis adaptation, from the standpoint of national food security as a whole, it has exposed fatal limits. Many economists and policy analysts argue that the fundamental problem of Cuban agriculture lies not on the technical side but in the structural defects of the socialist economic model.

The Critique by Mesa-Lago and Paarlberg

Carmelo Mesa-Lago, called "the dean of Cuba's economists," argues that the biggest cause of the slump in Cuban agriculture is the refusal to transition to the kind of "socialist market economy" (a hybrid economy) that China and Vietnam adopted, and the failure to allow the formation of a strong private sector and the introduction of market mechanisms.

Acopio — Structural Defects of the State Procurement System

The system that symbolizes this structural defect is the state agricultural procurement system known as "Acopio."

• Cuban farmers and cooperatives are required to sell up to 70% of what they produce to a state agency (Acopio) at official prices set well below market prices
• Farmers cannot autonomously decide what to plant or at what price to sell, and are subordinated to unrealistic quotas set by state bureaucrats (Robert Paarlberg and others)
• During the 1990s crisis, the Cuban government has been criticized for not abandoning the state-controlled economy, but instead extending the system's life by retreating into pre-modern production techniques such as plowing with oxen and horses, and weeding by hand

Absence of Autonomous Production Incentives

The structural absence of incentives stripped the will to produce away from farmers entirely. As a result:

• Despite abundant agricultural land, and despite being a country whose food self-sufficiency was high enough to rank third in calorie consumption in Latin America in the 1950s before the revolution,
• today's Cuba has fallen into the dismal paradox of having to import 70 to 80% of domestic food demand

The unbridgeable contradiction between state ideology and market reality is the foreshadowing of the further catastrophic crisis now unfolding.

This proves, from the opposite side, the importance of the stance presented in Chapter 4 of this series: "advance structural transition while keeping the market mechanism alive." No matter how good agroecology is technically, food sovereignty cannot be established if producer autonomy and market mechanisms are absent.

9.11 The Second Crisis (2024–2026) — System Collapse

If the Special Period of the 1990s was the "first crisis," then Cuba is now in the midst of a "second crisis" that is at least as severe and harder to resolve.

Collapse of the Macroeconomy and Energy Infrastructure

• The COVID-19 pandemic effectively wiped out international tourism, Cuba's largest source of hard currency
• Sanctions strengthened under the Trump administration and maintained under the Biden administration (such as the designation as a state sponsor of terrorism) have completely cut Cuba off from international financial networks and investment
• GDP growth in 2024 was −1.1%, with prolonged recession continuing
• Official inflation was reported at 14% as of 2025, but private estimates put it close to 70%, with the population's purchasing power effectively wiped out
• The collapse of the energy sector is even more serious: Cuba's domestic oil production covers only about a third of total demand, with the rest having long depended on preferential imports from its ally Venezuela. But Venezuela's own economic crisis has fully halted oil supply to Cuba
• In October 2024, a "nationwide blackout" cut power across the country for several days, and to this day, going without power for most of the day has become routine

Breakdown of the Agricultural Supply Chain and Climate Disasters

The lack of fuel and electricity is also undoing the efforts of farmers practicing agroecology.

• Not only is there no diesel to run tractors, there is no electricity to run irrigation pumps either, so planting is delayed and yields collapse
• The trucks that carry harvested fresh vegetables (such as tomatoes) from rural areas to city markets and processing facilities cannot run — leading to the tragic situation of huge amounts of food rotting in the fields
• Hurricanes Oscar (October 2024), Rafael (November 2024), and Melissa (October 2025) physically destroyed agricultural infrastructure
• By the end of 2024, government agricultural production targets were missed across the board, and production of basic foods such as eggs, meat, and milk fell to record lows

Deepening Food Dependence on the U.S. and Population Outflow

• With domestic production collapsing, Cuba's food security is now paradoxically being held up by imports from the very United States that imposes sanctions on it (under the exception in the 2000 Trade Sanctions Reform and Export Enhancement Act, TSREEA, U.S. agricultural products can be imported on a cash-in-advance basis)
• In just five months from January to May 2025, Cuba imported about USD 204.92 million worth of products from the United States (up 16.6% year-on-year)
• The largest share (42.2%) was frozen chicken, followed by powdered milk, liquid milk, rice, and so on
• The government rationing system (libreta, ration book) is almost entirely dependent on these imports, but due to the foreign-exchange shortage, ration delays and shortages are routine, to the point where the WFP (UN World Food Programme) has had to step in with direct food aid
• Following the government's hard-line crackdown on the July 2021 anti-government protests (11J) — with more than 650 people still imprisoned — Cubans continue the largest exodus in their history
• In just two years from December 2021 to December 2023, Cuba's population fell by 10% in official statistics
• Between January and August 2024, U.S. Border Patrol recorded more than 97,000 Cuban border crossings
• Mid-2026 estimates put the total population at 10.89 million, with a dramatic outflow of working-age population and rapid aging (median age 42.5 years as of 2026)
• The loss of the young and middle-aged population that should be carrying the labor-intensive practice of agroecology on the ground is making any recovery in agricultural production look hopeless

"Agroecology only runs when there are young people in rural areas" — this is a precondition of the CAC movement. An economic structure that lets population outflow run unchecked will drive any technical model, however excellent, into dysfunction.

9.12 Implications for Japan — What to Adopt and What to Avoid

From Cuba's experience, let us organize structurally what Japan should adopt and what it should avoid.

What to Adopt

1. Organopónico-style intensive urban and peri-urban agriculture

• As a production model for "crops not suited to mechanization" discussed in Chapter 7, deploy something on the scale of Havana's 35,000 ha across Japan's metropolitan areas — Tokyo, Osaka, Nagoya
• Balconies, rooftops, vacant lots, abandoned farmland, station-front spaces — a system of raised beds + compost + vermicompost + drip irrigation
• A distributed network under the philosophy of "food production by the neighborhood, of the neighborhood, for the neighborhood." The track record of covering 70 to 90% of vegetables consumed by Havana's urban population is something Japanese cities can reference as well

2. CREE-style regionally distributed, small-scale biopesticide production

• Here is the structural answer to the risk — discussed in Chapter 3 — that "a single hard-to-obtain pesticide can wipe out a whole crop"
• Regionally distributed biopesticide and biostimulant production hubs, run by collaborations among universities, prefectural agricultural research stations, regional NPOs, and JA
• Beauveria bassiana, Bacillus thuringiensis, Trichoderma, Trichogramma — these are inputs already studied and commercialized in Japan; mass-produce them at the regional level

3. Campesino a Campesino-style horizontal knowledge transfer

• This overlaps directly with Chapter 8's point that "natural farming cannot be transmitted by books alone — take in trainees and successors and pass it on"
• Cross-visits, workshops, farm tours, networks of natural-farming groups, and SNS dissemination — reassemble "farmer-to-farmer" in the Japanese context
• In particular, the mechanism for not isolating individual farms in organic JAS or regenerative-agriculture certification can only be secured through organized horizontal learning

4. Decree Law 259-style usufruct for idle land

• An institutional design that grants the long-term (10–25 year) usufruct to regenerative-agriculture practitioners over MAFF's 98,000 ha of recoverable degraded farmland discussed in Chapter 7
• Going beyond the existing Agricultural Land Act framework, build a mechanism that directly connects new entrants and abandoned farmland

What to Avoid

1. Acopio-style state control — strips autonomous production incentives

• Bind producers with state-set official prices and forced quotas, and no matter how excellent your agroecology technique, production will not grow
• In Japan, we need to keep checking that JA, the markets, and government intervention are not over-reaching
• "Autonomy and ownership decide productivity" — Cuba's own internal comparison between CPA (high autonomy) and UBPC (low autonomy) proves this

2. Drift toward "Organic by default" — don't anchor the motivation in coercion

• Don't get pushed into "no choice but organic" by phosphate-fertilizer supply constraints; autonomously choose the transition as the decision laid out in Chapter 3
• A transition whose motivation depends on external conditions will face revert pressure the moment those conditions change

3. Avoid splitting into a dual agricultural system

• Don't fall into the dichotomy of "urban and peri-urban is organic, exports and mass consumption are chemical"
• Combine the "three-tier classification of mechanizable crops" discussed in Chapter 7 with the "Brassicaceae limited to 5–10% of the area" approach to design a stepwise, system-wide transition

4. Don't underestimate the population infrastructure

• Agroecology is labor-intensive. If the young people who actually carry it on the ground are lost, the technical model does not function
• The aging of Japan's farming workforce (median age already over 60) carries a risk shaped similarly to Cuba's situation from 2024 onward
• Chapter 7's call for "new entrants at the side-job and full-time levels" and "taking in trainees and successors" is a direct response to the population-infrastructure problem

Not as a "Success Story," but as the "Most Honest Real-World Data"

Cuba must not be mythologized.

• Average calories −30%, 50,000 cases of optic neuropathy, average weight −12 pounds — the cost of transition was severe
• 70 to 80% of food has reverted to imports — food sovereignty is not established
• Today (2026), 10% of the population has flowed out, blackouts have become routine — the crisis is not over

But at the same time:

• The only country that built a national-scale food production system without chemical inputs
• Organopónicos, CREE, and CAC each functioned as independent technical and social innovations with a track record
• Became a reference model for the entire Global South

Cuba teaches us two truths at once: "the technique worked to a degree, but the institutions and the population could not be secured." Japan should learn from Cuba at the level of technique, and avoid Cuba's failures at the level of institutions and population — that is the path to take.

9.13 Closing Word — Bringing the Series to a Close

From Chapter 1 through Chapter 8, this series has built itself up — starting from the supply constraint on phosphate fertilizer, through the economic collapse of industrial farming, the biology of mycorrhizal fungi and PSB, and the operating principles of regenerative agriculture — closing the logic in on itself.

Cuba, the subject of Chapter 9, is the only national-scale empirical case for that logic. It is not a complete success story. Nor is it a complete failure story. It is the most honest real-world data: "technical substitution works, but does not endure without institutions and population to back it up."

What Japan faces from 2027 onward is a supply shock that is structurally the same as what Cuba experienced in the 1990s. The differences are:

• Time available (Cuba had almost zero, Japan has several to over a dozen years)
• Access to finance and technology (Cuba was under sanctions, Japan is open)
• Population structure (Cuba was young into the 1990s, Japan is already aging)
• Institutional flexibility (Cuba had state control, Japan has a market economy)

Look hard at these differences, and separate precisely what to adopt from what to avoid. That is why this series places Chapter 9 at the end.

Economics decided the farming method. But institutions and population are what sustain the farming method. The new farming method for the new era only stands when technique, institutions, and population come together as one.

Series Structure

• Chapter 0: Prologue
• Chapter 1: The Supply Constraint on Phosphate Fertilizer
• Chapter 2: Phosphate Fertilizer Will Not Come Back Cheap
• Chapter 3: Conventional Farming Will Cease to Be Economically Viable
• Chapter 4: A Realistic Stance
• Chapter 5: Soil Microbes — Mycorrhizal Fungi and PSB
• Chapter 6: CO2 as a Tailwind
• Chapter 7: How to Implement
• Chapter 8: Operating Principles
• Chapter 9: Lessons from Cuba — From the Only Nationwide Case Study (this chapter)

To everyone who read this series to the end.

aiseed.dev will keep covering both AI-native ways of working and farming in collaboration with nature. The trinity of technique, institutions, and population is not just an agricultural story. The way we work in the AI era itself is being put to the test along the same three dimensions of sustainability.

We recommend reading both series alongside one another.

References

Cuba's agricultural structure and the Special Period

• Cuba Platform, "Cuban Land Reform" — pre- and post-revolutionary land tenure structure, the 1959 and 1963 Agrarian Reform Laws
• The Guardian, "Organic or starve: can Cuba's new farming model provide food security?" — on-the-ground testimony for "Organic by default"
• FAO Crop Production Index (2004-2006 = 100) trajectory — 1989: 134.96 → 2015: 92.12 → 2016: 93.10
• Carmelo Mesa-Lago's economic analysis — the relationship between the refusal to move to a socialist market economy and the slump in agriculture
• Robert Paarlberg, Starved for Science — critique of the structural defects of Acopio and state control

Agroecology and urban farming

• Havana and nationwide organopónico statistics — 35,000 ha, 7,000 sites, 1.5 million tons/year
• Vegetable and herb output per person per day in Havana Province: 943 g (2003)
• Materials of the Cuban Ministry of Agriculture's Department of Urban Agriculture (founded 1994)
• The distinction between huertos intensivos and organopónicos

CREE and biocontrol

• CREE (Centers for the Reproduction of Entomophages and Entomopathogens) — 218 sites by the end of 1992; 15 million tons of biopesticides cumulatively in the 1990s
• Ecology of entomopathogens, antagonistic fungi, and parasitoid wasps relating to Beauveria bassiana, Bacillus thuringiensis, Trichogramma spp., Trichoderma spp., Heterorhabditis spp.
• The Bioinputs program — extension into biofertilizers and biostimulants

Campesino a Campesino movement

• The CAC movement led by ANAP (National Association of Small Farmers)
• Reintroduction of animal-traction farming with 288,888 head of livestock
• Pesticide use −85%, root vegetables +85%, vegetables +83%, pulses +351% (production changes during the transition)

International spread

• Collaboration between La Vía Campesina (LVC) and Cuba's ANAP
• Agroecological Revolution (edited by LVC and ANAP, with Oxfam and other support, multilingual editions)
• The international solidarity brigades of MST (Brazil's Landless Workers' Movement) — Apolonio de Carvalho Brigade (Venezuela), Jean-Jacques Dessalines Brigade (Haiti), Samora Machel Brigade (Zambia)

The dual agricultural system and pesticide residues

• The Swiss-Cuban joint research project "PERECUSO" — pesticide residue survey in potato-producing soils in Mayabeque Province (17 active ingredients detected, including azoxystrobin and cyproconazole)
• Half-life (DT50) under tropical climate and chronic ecotoxicological hazard ratios

The contemporary compound crisis (2020–2026)

• 2024 GDP −1.1%, official inflation 14% (private estimates 70%)
• Halt of oil supply from Venezuela; the October 2024 nationwide blackout
• Hurricanes Oscar (October 2024), Rafael (November 2024), Melissa (October 2025)
• January–May 2025 imports from the U.S. about USD 204.92 million, the largest 42.2% being frozen chicken
• 10% population decline from December 2021 to December 2023; over 97,000 U.S. border crossings from January to August 2024
• Mid-2026 population estimate of 10.89 million, median age 42.5
• The July 2021 anti-government protests (11J) and the government's hard-line crackdown

Source material for this chapter

• Gemini Deep Research, "The Transformation of Agricultural Structure in Cuba and the Development of Agroecology: A Comprehensive Analysis of Historical Background, Practical Mechanisms, and the Contemporary Crisis" (articles/phosphorus-and-farming/09-cuba-lessons/キューバ有機農業への転換と課題.pdf)