Cultivation, Agriculture and Domestication Are Not the Same Thing

Three words are often treated as synonyms in discussions of early farming:

cultivation, agriculture, and domestication.

They are not.

Understanding the difference completely changes how we interpret the origins of farming.

Cultivation is a human behaviour

Cultivation refers primarily to what people do.

Humans may clear vegetation, loosen soil, sow seeds, transplant plants, water them or protect useful species.

These behaviours are culturally transmitted.

A child can learn when to sow seeds, how deeply to plant them or which patch of soil produces the best crop without any genetic change occurring in the plant.

Crucially, people can cultivate completely wild plants.

That means cultivation can exist long before domestication.

Agriculture is an economic system

Agriculture involves cultivation becoming sufficiently regular and important that it becomes central to community subsistence.

Instead of occasionally managing plants, societies begin organising substantial amounts of labour, land and seasonal activity around food production.

Agriculture can also involve livestock, although animal husbandry is not necessary for the definition.

Agriculture is therefore principally an ecological and socioeconomic system.

Domestication is biological evolution

Domestication concerns the plant.

A domesticated plant population has evolved characteristics that adapt it to environments created or maintained by humans.

Some crops ultimately became so dependent on people that they could no longer reproduce efficiently without human intervention.

Consider wheat.

Wild wheat naturally disperses its seeds.

Its seed heads break apart when mature, allowing seeds to fall to the ground.

For a wild plant, this is excellent evolutionary engineering.

For a farmer, it is terrible.

Seeds that fall before harvest disappear into the soil.

Domesticated wheats therefore evolved seed heads that remain attached until humans harvest them.

From the plant's perspective, this sounds disastrous. It has lost part of its natural dispersal mechanism.

But inside an agricultural ecosystem it is extremely successful because humans harvest, store, transport and sow those seeds.

The plant effectively outsourced dispersal to people.

Domestication syndromes

Domesticated plants often evolve suites of correlated features known as domestication syndromes.

For seed crops, these can include:

larger seeds,

reduced dormancy,

non-shattering seed heads,

changes in plant architecture,

more synchronous maturation,

reduced physical or chemical defences,

and adaptations to human harvesting and storage.

But different kinds of crops evolve different syndromes.

The comparison in Table 1 of the paper is especially revealing.

Cereals tend toward sexual reproduction through seeds and annual growth cycles.

Vegetatively propagated crops such as potatoes, cassava, taro and yams may move in almost the opposite evolutionary direction. Human cultivation can favour perennial growth and reproduction through tubers, shoots, corms or other vegetative organs.

There is therefore no universal domestication blueprint.

The distinction solves an archaeological puzzle

Once cultivation and domestication are separated, something important becomes visible.

Humans may have cultivated plants for hundreds or thousands of years before recognisably domesticated forms became dominant.

Archaeologists therefore should not expect the first evidence of cultivation and the first evidence of domesticated morphology to occur simultaneously.

The emergence of agriculture was a process, not a switch.

And that observation leads directly to one of the biggest discoveries in modern domestication research: domestication was surprisingly slow.

###################################################################################

Further reading: This post is inspired by and draws on Dorian Q. Fuller, Tim Denham, and Robin Allaby, “Plant domestication and agricultural ecologies,” Current Biology 33, no. 11 (2023): R636–R649, doi:10.1016/j.cub.2023.04.038. Read the original article in Current Biology
For a classic and highly readable perspective on why plant domestication arose in some regions but not others, see Jared Diamond, Chapter 8, “Apples or Indians: Why Did Peoples of Some Regions Fail to Domesticate Plants?”, in Guns, Germs, and Steel: The Fates of Human Societies (W. W. Norton, 1997), pp. 131–156. Read “Apples or Indians” View Guns, Germs, and Steel on Google Books

################################################################################### 

Agriculture Was Not an Invention. It Was an Ecological Transformation

We often tell the history of agriculture as though someone, somewhere, had a brilliant idea: instead of collecting wild plants, why not plant them?

The archaeological record tells a much stranger and more interesting story.

Agriculture emerged through thousands of years of interaction among people, plants, landscapes, animals, weeds, pests, climate and technology. Humans did not simply domesticate plants. Plants, in a very real evolutionary sense, also adapted to living with humans.

This is the central idea of plant domestication as coevolution.

Humans created a new ecological niche

Before farming, plants already formed the foundations of terrestrial food webs. Human hunter-gatherers exploited those food webs by collecting fruits, seeds, roots, tubers and nuts.

Cultivation changed the rules.

People began clearing vegetation, disturbing soil, concentrating useful plants, moving seeds, digging tubers, burning landscapes, sowing particular patches and repeatedly harvesting from them.

These activities created entirely new ecological environments.

Agricultural fields were therefore not simply places where food was produced. They were evolutionary arenas.

Crop plants benefited from human protection and dispersal. Humans benefited from increased food production. But other organisms joined the system too.

Mice ate stored grain. Weevils colonised harvests. Sparrows followed settlements. Weeds adapted to disturbed agricultural soils.

The authors describe some of these hitchhikers as “parasitic domesticoids”, organisms that evolved around the crop-human system without necessarily being intentionally domesticated.

Agriculture therefore created something closer to a new food web than a simple human-crop partnership.

Agriculture redirected ecological energy

Photosynthesis captures solar energy and converts it into plant biomass.

Agriculture increasingly redirected that primary productivity toward a narrow group of organisms:

humans, domesticated crops, livestock and organisms associated with them.

As agriculture intensified, landscapes that had supported diverse wild ecosystems increasingly channelled energy into wheat fields, rice paddies, maize plots, orchards, pasture systems and human populations.

The result was extraordinary.

Agricultural societies could support larger and often more sedentary populations. Domesticated plants expanded far beyond their ancestral ranges. Entire ecosystems were reorganised.

By several thousand years ago, these processes were already influencing landscapes at continental scales.

Humans did not invent agriculture only once

Another important implication follows.

Agriculture was not a single discovery radiating outward from one centre.

Plant domestication occurred independently in numerous regions, involving completely different plants and cultivation systems.

The Fertile Crescent produced wheat, barley and pulses.

China contributed rice, millets and soybean.

Mesoamerica saw maize, beans, squash and chilli domestication.

South America produced potatoes, quinoa and manioc.

Africa contributed sorghum, pearl millet, African rice and many other crops.

New Guinea developed agricultural systems centred partly on vegetatively propagated crops.

Different communities therefore entered agricultural relationships through different ecological doors.

Agriculture is still evolving

This perspective matters today.

Agriculture is not the endpoint of domestication. It is an ongoing ecological experiment.

Modern agriculture represents only the latest configuration of relationships that began thousands of years ago.

Understanding those older systems may therefore help us rethink future agriculture, particularly questions of crop diversity, resilience and sustainability.

The remarkable lesson is that agriculture was never simply about humans controlling nature.

Agriculture emerged because humans became deeply entangled with it.

###################################################################################

Further reading: This post is inspired by and draws on Dorian Q. Fuller, Tim Denham, and Robin Allaby, “Plant domestication and agricultural ecologies,” Current Biology 33, no. 11 (2023): R636–R649, doi:10.1016/j.cub.2023.04.038. Read the original article in Current Biology
For a classic and highly readable perspective on why plant domestication arose in some regions but not others, see Jared Diamond, Chapter 8, “Apples or Indians: Why Did Peoples of Some Regions Fail to Domesticate Plants?”, in Guns, Germs, and Steel: The Fates of Human Societies (W. W. Norton, 1997), pp. 131–156. Read “Apples or Indians” View Guns, Germs, and Steel on Google Books

###################################################################################