Can Chickpeas Grow on the Moon? Researchers Report Success with Lunar Soil Simulant

The dream of long-term lunar habitation took a small but significant step forward this week, with researchers announcing they’ve successfully grown chickpeas – and harvested seeds – in soil mimicking lunar conditions. The findings, published March 5 in Scientific Reports, offer a glimmer of hope for future astronauts who may need to cultivate their own food sources on the Moon. The research, a collaboration between the University of Texas at Austin and Texas A&M University, demonstrates that with the right amendments, even the harsh, nutrient-poor lunar regolith can support plant life.

Lunar regolith, often described as fine, powdery dust, presents a formidable challenge to agriculture. It’s not only lacking in essential nutrients like nitrogen, but also contains potentially toxic metals and has a sharp, abrasive texture. As space biologist Jess Atkin of Texas A&M University explained, “It is a hazard unamended… It is the worst. It is awful.” Previous attempts to grow plants directly in actual lunar regolith collected during the Apollo missions showed limited success, with plants exhibiting stress and absorbing harmful metals.

Addressing the Challenges of Lunar Soil

The UT and Texas A&M team tackled these challenges by focusing on two key strategies: introducing beneficial fungi and enriching the regolith with compost. They used a lunar regolith simulant – a terrestrial blend designed to replicate the composition of moon dirt – and combined it with vermicompost, a nutrient-rich fertilizer produced by red wiggler worms consuming food waste. Crucially, they also inoculated the chickpea seeds with arbuscular mycorrhizal fungi. These fungi form a symbiotic relationship with plant roots, extending their reach into the soil and aiding in nutrient absorption whereas also helping to sequester heavy metals.

Chickpeas were chosen for their resilience and high protein content, making them a potentially valuable food source for lunar inhabitants. The researchers planted the seeds in mixtures containing up to 75% lunar simulant, carefully monitoring their growth over weeks and months. The results were encouraging: the plants not only germinated and grew, but also produced flowers and, importantly, seeds.

Evidence and Limitations of the Study

While the plants grown in lunar simulant mixtures showed signs of stress compared to those grown in standard Earth soil, the addition of fungi significantly improved their resilience. Plants treated with fungi lived two weeks longer than those without fungal assistance. This suggests that these symbiotic relationships could be crucial for establishing sustainable agriculture in lunar environments. As reported by the Houston Chronicle, Sara Oliveira Santos, a fluid dynamicist at the University of Texas at Austin, expressed her excitement about the seed production, calling it “really important.”

However, it’s important to note the limitations of this study. The research utilized a simulant of lunar regolith, not actual moon dirt. While these simulants are carefully formulated to mimic the chemical and physical properties of the lunar surface, they are not perfect replicas. The study did not assess the nutritional content or safety of the chickpeas grown in the simulant. The researchers are currently conducting further tests to determine if the seeds can produce viable latest generations of plants and whether those plants are safe for human consumption.

What Does This Mean for Future Lunar Missions?

The success of this experiment offers a promising pathway towards establishing self-sustaining food production systems on the Moon. NASA’s Artemis program aims to return humans to the Moon in the coming years, with the long-term goal of establishing a permanent lunar base. The ability to grow food on-site would significantly reduce the logistical challenges and costs associated with transporting supplies from Earth.

The employ of fungi and vermicompost represents a potentially sustainable approach to lunar agriculture. Vermicompost, in particular, offers a way to recycle waste materials, creating a closed-loop system that minimizes resource dependence. Atkin envisions a future where fungi and compost transform lunar soil into a fertile medium capable of supporting a wide range of crops. “The plants are amazing, it’s great People can get seeds,” she said, “But they’re really the host for the transformation into the soil.”

Beyond Chickpeas: Expanding the Possibilities

While this study focused on chickpeas, the principles demonstrated could be applied to other crops as well. Researchers are exploring the potential of growing other hardy plants, such as potatoes and leafy greens, in lunar regolith. Science News reports that the team is now investigating whether the seeds produced in the simulant can successfully germinate and grow new plants, and whether those plants are safe to eat. Santos jokingly expressed her eagerness to sample the results, stating, “I asked to eat it, but she [Atkin] said no.”

What Comes Next: Testing and Refinement

The next steps in this research involve rigorous testing of the seeds and plants grown in lunar simulant. Researchers will analyze their nutritional content, assess their safety for human consumption, and evaluate their ability to thrive in long-term lunar conditions. Further studies will also explore the optimal ratios of lunar simulant, vermicompost, and fungal inoculants to maximize plant growth and yield. The team is also investigating the potential for using genetically modified plants to enhance their tolerance to the harsh lunar environment. The goal is to develop a comprehensive understanding of the challenges and opportunities associated with lunar agriculture, paving the way for a sustainable and self-sufficient human presence on the Moon.

If the seeds prove safe, Atkin has a clear vision for the future: “I will be the first one to craft some moon hummus.”