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The Green Revolution: history, crop varieties and consequences

From Mexico to Asia: Borlaug’s wheat, IR8 rice, irrigation and institutions, with the achievements and limits of the Green Revolution.

1940s–1960s · Mexico, followed by India, Pakistan and elsewhere · Technology & breeding

The Green Revolution combined changes in plant breeding, cultivation and the organisation of food production. Its best-known examples include wheat developed in Mexico and IR8 rice bred in the Philippines. Earlier research gained particular importance during the 1960s. This was not, however, one variety, one country or the independent achievement of a single scientist.

What does the Green Revolution encompass?

The term primarily concerns the spread of new crop varieties together with the conditions that allowed their productive potential to be realised. For cereals, seeds, water, nutrients, crop protection and the organisation of field work all mattered. The name describes a process extending across many growing seasons rather than one exceptional harvest. Its form and timing depended on the crop, region and resources available to the farms taking part.

This does not mean that earlier agriculture lacked knowledge or innovation. Modern breeding drew on existing plant diversity and developed within societies with their own cultivation traditions. The scale of research, institutional networks and speed at which selected practices spread changed. Dividing history into “before” and “after” can be a convenient chronological shorthand, but it does not imply that every earlier practice was replaced at once or that farmers began contributing knowledge only after research institutes appeared.

Mexico: a research programme, not a solitary inventor

The work from which CIMMYT emerged developed through collaboration between the Mexican government and the Rockefeller Foundation during the 1940s and 1950s. Norman Borlaug played an important role in wheat research, alongside other breeders, technicians and national partners. Formally established in 1966, CIMMYT expanded international collaboration on maize and wheat. The institutional setting matters because research required people, land, resources and continuity over many cycles of evaluation.

An important method was shuttle breeding, which involved successive breeding cycles and selection in contrasting environments. Ciudad Obregón and Toluca hold significant places in its Mexican history. Testing material under different conditions helped reveal its responses. This demonstrates why geography is part of the explanation: an experimental field is not a neutral stage. Climate, elevation and disease pressure influence the traits that researchers can observe and the environments for which a plant may prove useful.

Why could a shorter stem help increase production?

Plant height is not a straightforward measure of grain output. Long stems can increase susceptibility to lodging under particular growing conditions and weather. Breeders therefore combined plant architecture with disease resistance, responses to day length and the ability to yield in the target environment. A variety had to function as a complete plant. Reducing height alone was never a universal recipe for success, and an agronomically useful combination involved more than one visible characteristic.

In the mid-1960s, shorter-stemmed wheat varieties developed in Mexican programmes reached India and Pakistan. Borlaug received the Nobel Peace Prize in 1970. The award recognises the importance of this work, but cannot replace the history of implementation. Seed had to be tested, multiplied, distributed and incorporated into local practices. Farmers participated in the process rather than simply receiving a finished solution: their experience and the conditions under which they cultivated it helped determine what the material actually achieved.

IR8 rice and the Philippine chapter of the transformation

The history of rice developed alongside that of wheat. The International Rice Research Institute, established in 1960, carried out research in the Philippines. IR8 was officially released on 28 November 1966. It resulted from a cross between the tall Indonesian variety Peta and the dwarf Taiwanese variety Dee-geo-woo-gen. Its ancestry shows how an international breeding achievement depended on plant material originating in different societies and environments.

IR8 became a symbol of new production possibilities, but the symbol should not obscure the stages that followed breeding. National partners helped test and distribute the variety. A result from an experimental plot cannot simply be assumed to apply in every region. Water conditions, the growing season and crop management remained important. Like wheat improvement, rice improvement involved a network of trials and adaptations rather than the straightforward replication of one model field across a continent.

Why did seeds need infrastructure?

A new variety carries biological potential, not a guarantee of a particular harvest. When water or nutrients are limiting, part of that potential remains unrealised. Sowing dates, crop establishment, pest pressure and harvesting arrangements also matter. FAO therefore treats the Green Revolution as an interaction between crop improvement, agronomic conditions and the institutional environment of production. Looking at seeds alone leaves much of the historical explanation out of view.

An irrigation canal, seed multiplication system, advisory service and market each address a different problem. None can simply substitute for all the others. Credit may make a purchase possible but cannot remove a drought; a suitable variety cannot repair an unreliable transport network. This explains why transferring seeds between countries did not automatically transfer every benefit. The conditions for effective adoption had to be built and maintained across successive seasons, while local knowledge remained important in deciding how the available resources were used.

Production gains and unequal access to their benefits

New varieties and cultivation methods contributed to rising cereal production. Greater food supplies could also benefit people who did not grow crops themselves. Assessment should consequently extend beyond the farms adopting improved seed. Producers, workers and consumers need separate consideration: selling grain provides income for some households, while buying food is an expense for others. The same movement in market prices can therefore affect different groups in different ways.

Benefits were not distributed evenly. Regions with controlled water supplies had opportunities different from those relying on uncertain rainfall. Land rights, finance, knowledge and market access mattered. Africa’s diverse agricultural systems also did not correspond to a single model of Asian intensification. A useful evaluation asks who benefited, where and when, rather than declaring an identical success or failure for every farmer. Regional averages help describe a broad change but can conceal the conditions faced by particular communities.

Environmental costs and the adjustment of practices

More intensive production changed water and nutrient demand and the ways crops were protected. Inappropriate chemical use could harm natural enemies of pests, while nutrient losses affected receiving waters. FAO accounts of rice production describe how these experiences contributed to integrated pest management and more balanced nutrient management. Such developments belong to the history of the transformation itself, rather than being unrelated issues added to it afterwards.

The potential of a variety should be distinguished from the rules under which it was cultivated. Higher yield potential does not mechanically prescribe one fertiliser rate or one approach to pest control. Environmental outcomes depend on management choices and local conditions. Historical assessment should therefore follow revisions as well as initial adoption: observing fields, identifying actual problems and adjusting interventions. The Green Revolution did not remove the need for research. It exposed further questions about how to sustain productive gains without undermining the resources on which they depended.

How can the transformation be assessed without simplification?

Production growth, yield growth, farm income and improved nutrition are different outcomes. More grain can be harvested per hectare while costs also rise. Cereal availability can improve without guaranteeing a diverse diet for everyone. Pingali’s assessment highlights these distinctions while considering both achievements and limitations. Food quantity is important, but food security also concerns people’s access to supplies and the stability of that access over time.

When reading evidence, it is useful to ask what the comparison measures. Two years, two farms and a controlled field experiment are not identical comparisons. Weather, cultivated area and other inputs may change alongside the variety. The most complete account combines breeding histories, field results, economic evidence and social research. The Green Revolution’s legacy therefore includes particular crop varieties and a broader analytical lesson: agricultural success must be examined at several levels at once. A record harvest can be a significant achievement without resolving every question about livelihoods, environmental durability or the quality of the food available.

Questions and answers

Was the Green Revolution Borlaug’s achievement alone?

No. Borlaug played a major role in wheat improvement, but the transformation involved many breeders, national institutions, technicians and farmers. Rice improvement also had its own teams and research centres.

Was IR8 a wheat variety?

No. IR8 was a semidwarf rice variety developed by IRRI and officially released in 1966. Rice research in the Philippines should be distinguished from the parallel history of wheat improvement in Mexico.

Do larger harvests automatically eliminate hunger?

No. Higher production can improve supply, but incomes, food access, distribution and dietary quality also matter. Judging the transformation only through cereal tonnage overlooks some of those relationships.

Sources

History of agriculture: all topics