Across the world, researchers operate within established principles that guide their work, widely recognized as one of the most reliable pathways to solving societal challenges.
Within academic and scientific communities, a widely accepted view persists: arguments grounded in research can only be effectively challenged through equally rigorous, evidence-based findings.
This philosophy highlights the central role of research in shaping informed decision-making.
Across sectors such as education, health, agriculture, water, the economy, and environmental management, studies continue to influence policy, guide interventions, and deepen understanding.
At its core, research seeks to provide clear answers—whether positive or negative—to the issues confronting societies.
Tanzania, as part of this global knowledge system, has consistently relied on its researchers to generate insights that inform action in key sectors.
These efforts extend beyond major institutions to include individuals, non-governmental organizations, and students at all academic levels, from diploma to doctoral studies.
Among these emerging researchers is Christina Hambo, a PhD student in Agroecology at Sokoine University of Agriculture. Her work combines scientific rigor with a strong personal connection to farming.
Hambo’s research focuses on developing a liquid organic fertilizer produced through ecological methods. Her interest stems from firsthand experience with the limitations of traditional fertilizers such as manure and compost. Raised in a farming and livestock-keeping family in Chunya District, Mbeya Region, she draws inspiration from the realities faced by smallholder farmers.
She explains that existing studies reveal the scale of the challenge. Producing yields from one hectare of land may require up to seven tons of manure. For farmers managing larger areas, this quickly becomes impractical. A farmer with 100 hectares, for example, would need around 700 tons of manure—an amount that is both difficult to obtain and manage.
As a result, many farmers turn to industrial fertilizers. While these may offer short-term productivity gains, they also pose risks to soil health, crop quality, human well-being, and the environment.
It is within this context that Hambo’s work becomes especially relevant. A strong advocate of agroecology, she is developing a liquid organic fertilizer containing Nitrogen, Phosphorus, and Potassium (NPK). Unlike industrial inputs, her formulation is chemical-free, environmentally safe, and highly efficient.
One of its key advantages is its low application rate. Hambo notes that only half a liter is required per hectare, a significant reduction compared to conventional fertilizers. This efficiency could ease the burden on farmers while maintaining productivity.
Her dedication to sustainable agriculture began earlier in her academic journey. During her master’s studies, she focused on improving soil fertility through mixed farming methods, achieving positive results that informed her current research.
Further studies have shown that poorly managed manure or compost can negatively affect agricultural productivity. In contrast, the liquid fertilizer she is developing offers a more controlled and efficient solution, capable of delivering nutrients effectively across large areas with minimal input.
Hambo emphasizes that her formulation aligns with agroecological principles, including food safety, environmental conservation, and public health. It provides essential nutrients for plant growth while avoiding the harmful effects associated with synthetic chemicals.
Developed in collaboration with her supervisors, the fertilizer has undergone extensive laboratory testing, yielding promising results. The formulation incorporates organic materials such as animal blood, fish waste, sunflower, rabbit urine, comfrey leaves, seaweed, moringa, and azolla.
Laboratory analysis revealed that fish waste contains a high nitrogen content—about 20.3 percent—making it a key component. Azolla was found to be rich in phosphorus, while comfrey leaves contribute significant potassium. The fertilizer also contains trace elements such as zinc and manganese, which are essential for plant health.
To validate these findings, controlled experiments were conducted. A mixture of raw materials weighing 150 grams was combined with 1.8 liters of water to extract nutrients into liquid form. The solution was then covered and left to ferment for 12 weeks.
Samples were collected every two weeks and analyzed in the laboratory. By the fourth week, results were already encouraging, particularly in nitrogen levels. Following this success, a second phase using fish waste, wild sunflower, comfrey, and azolla also produced positive results.
With both laboratory and field trials showing promise, the research has now entered the stage of determining the fertilizer’s shelf life. This is essential for ensuring its practical use and future commercialization.
In the meantime, field trials have demonstrated its effectiveness. Tests conducted on tomato farms with no prior nutrient input yielded positive results, further confirming its potential.
Comparative studies between the organic formulation and industrial NPK fertilizers have also been conducted. According to Hambo, her product has shown superior nutrient performance, reinforcing its viability as an alternative.
Looking ahead, she plans to begin production after completing her PhD, focusing on making the fertilizer accessible to small-scale farmers. She also intends to offer training programs to enable farmers to produce the fertilizer themselves using locally available materials.
Her long-term vision includes establishing a processing facility for liquid organic fertilizer while promoting knowledge-sharing to encourage wider adoption of agroecological practices.
Hambo underscores the urgency of shifting toward sustainable agricultural inputs. With growing populations and limited land resources, maintaining soil health is critical. Overreliance on industrial fertilizers, she warns, risks degrading soil quality and undermining long-term productivity.
She argues that scientists have a responsibility to expand agricultural research in ways that restore ecological balance and protect resources for future generations. In her view, agroecology offers the most effective path forward.
Support for such research is already being mobilized. Betty Malaki, Country Director of SwissAid Tanzania, highlights the organization’s role in funding research that addresses farmers’ challenges. Hambo is among the beneficiaries, and her work is seen as a promising solution.
SwissAid has funded three PhD students from SUA in the current cycle, focusing on translating research findings into practical outcomes. The organization promotes agroecology as a means of reducing poverty, addressing climate change, and strengthening smallholder farmers’ resilience.
Its initiatives include projects to revive neglected crops in regions such as Lindi, Mtwara, and Dodoma, aligning with broader sustainability goals.
Industry stakeholders have also recognized the significance of Hambo’s work. Pesa Kusaga, Advocacy Officer at Pelum Tanzania, notes that the innovation could transform agroecological farming.
He points out that farmers have long relied on fertilizers that take time to produce. A liquid organic alternative could save time while improving crop health through balanced nutrient supply.
Kusaga also emphasizes its environmental benefits. Being chemical-free and low-cost, the fertilizer is accessible and sustainable, making it suitable for widespread use.
He further calls on young researchers to ensure their work extends beyond academic institutions, contributing directly to communities and encouraging youth participation in agriculture. At the policy level, he urges the government to streamline regulatory processes for registering fertilizers and agricultural inputs developed through research.
As Hambo’s work progresses, it stands as a clear example of how science, grounded in local realities and driven by practical needs, can deliver transformative solutions. Her research not only addresses immediate agricultural challenges but also contributes to a broader vision of sustainable and resilient food systems.
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