Coffee Varieties Blend Unlocks Higher Yields, New Research Reveals
A new study conducted in Côte d’Ivoire has revealed that planting a carefully selected combination of six high-performing robusta coffee varieties can dramatically improve coffee yields while enhancing quality and climate resilience. The research, carried out over several years, found that farmers using the mixed-variety approach could achieve yield increases of up to 86 percent compared to the commonly grown local coffee variety, all while using the same level of agricultural inputs.
The findings mark an important breakthrough for Côte d’Ivoire’s coffee sector, which remains a major source of income for thousands of farming families but is facing increasing challenges linked to climate change, declining productivity, and fluctuating weather conditions. Researchers believe that adopting more resilient and productive coffee varieties could play a key role in strengthening the long-term sustainability of coffee farming in the country.
The research was conducted by the Nestlé Institute of Agricultural Sciences in partnership with the Centre National de Recherche Agronomique (CNRA), Côte d’Ivoire’s national agricultural research organization. Since 2018, scientists from both institutions have collaborated to evaluate the performance of 18 robusta coffee varieties across four important coffee-growing regions of the country.
The study focused on identifying varieties capable of performing well under increasingly difficult environmental conditions. Researchers assessed a wide range of characteristics, including yield potential, bean quality, cup flavor, drought tolerance, and the ability to withstand climate-related stress. The objective was not only to increase coffee production but also to improve the quality and consistency of robusta coffee while ensuring resilience against changing weather patterns.
After years of evaluation, six standout varieties were selected as the strongest performers. Two of these varieties were developed by Nestlé researchers, while the remaining four were created by CNRA scientists. Rather than recommending a single superior variety, researchers decided to test whether combining the six varieties in the same plantation could offer additional benefits.
The results exceeded expectations. Trials demonstrated that the varietal mix consistently delivered stronger performance than individual varieties or traditional local plantings. Farmers using the combination saw significant improvements in yield, better resilience to drought and climate stress, and enhanced overall plant health.
In addition to productivity gains, the mixed-variety approach also improved coffee quality. Sensory analysis carried out during the trials showed that coffee produced from the six-variety blend had a smoother and more balanced flavor profile. Tasters noted reduced bitterness and fewer woody characteristics, traits commonly associated with traditional robusta coffee. This finding is particularly important as demand grows for higher-quality robusta beans in the global coffee market.
The six selected varieties have now been officially registered in Côte d’Ivoire, clearing the way for wider distribution to coffee farmers across the country. The varieties will be made available through cooperatives participating in the Nescafé Plan, Nestlé’s sustainable coffee sourcing and farmer support program.
The initiative reflects growing efforts within the coffee industry to develop climate-smart agricultural solutions that can support both productivity and farmer livelihoods. Côte d’Ivoire, currently the third-largest coffee producer in Africa, has experienced increasing pressure from climate change in recent years. Rising temperatures, irregular rainfall patterns, and prolonged dry periods have negatively affected coffee production and increased uncertainty for growers.
According to Hubert Coffi, Agronomy Manager for the Nestlé Institute of Agricultural Sciences in Côte d’Ivoire, identifying resilient coffee varieties has become increasingly critical for the future of the sector.
He explained that changing climate conditions are already affecting crop health and reducing yield stability in many coffee-growing areas. Through partnerships with organizations such as CNRA, Nestlé is working to identify solutions that can help farmers adapt to these evolving challenges while maintaining coffee quality and productivity.
Nestlé’s coffee breeding and research activities in Côte d’Ivoire are centered at its experimental farm in Zambakro. At this facility, researchers conduct field trials and evaluate coffee plants under real agricultural conditions. The work is carried out in collaboration with local research partners as well as the Plant Sciences Department of the Nestlé Institute of Agricultural Sciences located in Tours, France.
The Zambakro farm also serves as a training center for local farmers. In addition to testing improved coffee varieties, Nestlé specialists provide practical instruction on regenerative agriculture and sustainable farming techniques. Farmers receive guidance on soil management, water conservation, crop diversification, pruning practices, and other methods designed to improve long-term farm productivity while reducing environmental impact.
The company believes that combining improved genetics with better farming practices is essential to building a more resilient coffee supply chain. By helping farmers adopt climate-adapted coffee varieties and sustainable cultivation methods, Nestlé aims to support stable coffee production while improving farmer incomes and protecting natural resources.
The latest research in Côte d’Ivoire is part of Nestlé’s broader global coffee breeding program, which uses classical breeding methods to develop coffee plants that are more productive, disease-resistant, and drought-tolerant. The program focuses on creating varieties suited to local growing conditions in key coffee-producing countries around the world.
Unlike genetic modification, classical breeding involves selecting and crossing naturally occurring coffee plants with desirable characteristics over multiple generations. Researchers then test the resulting varieties extensively under real farming conditions before making them available to growers.
Nestlé has already introduced several new coffee varieties in other coffee-producing nations. In Mexico, the company recently developed Roubi 1 and Roubi 2, two robusta varieties capable of delivering up to 50 percent higher yields than traditional varieties. In Brazil, researchers introduced Star 4, a new Arabica coffee variety featuring larger beans and improved resistance to coffee leaf rust, one of the most damaging diseases affecting coffee plants worldwide.
The success of the Côte d’Ivoire trials highlights the growing importance of agricultural innovation in safeguarding the future of coffee production. As climate challenges continue to intensify across major coffee-growing regions, researchers and industry leaders are increasingly focused on developing practical solutions that can help farmers maintain productivity and profitability.
For coffee farmers in Côte d’Ivoire, the introduction of these six high-performing robusta varieties could represent a major opportunity to improve harvests, strengthen resilience against climate uncertainty, and produce higher-quality coffee capable of meeting evolving market demands.
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