It is a distinct privilege to introduce Dr. Qazi Shoaib Ali, a visionary and highly accomplished PhpH is a measure of how acidic or alkaline a substance is. A pH of 7 is neutral, while lower pH values indicate acidity and higher values indicate alkalinity. Biochars are normally alkaline and can influence soil pH, often increasing it, which can be beneficial More.D. in Horticulture from The University of Agriculture, Peshawar, and a sesoned researcher in biocharBiochar is a carbon-rich material created from biomass decomposition in low-oxygen conditions. It has important applications in environmental remediation, soil improvement, agriculture, carbon sequestration, energy storage, and sustainable materials, promoting efficiency and reducing waste in various contexts while addressing climate change challenges. More science and sustainable soil remediation. Dr. Qazi’s expertise is centered on the critical challenge of ensuring food safety and security in a changing environment. His extensive doctoral work was dedicated to evaluating the transformative power of biochar, specifically focusing on “The effect of biochar and organic fertilizers on the performance of tomato grown on heavy metals contaminated soil.” This research was not merely theoretical; it involved the design and execution of complex field and controlled environment experiments to measure biochar’s efficacy in improving soil quality, mitigating heavy metal contamination, and enhancing crop yield. Through this rigorous work, Dr. Qazi has gained in-depth, practical expertise in soil remediation using biochar, nutrient cycling, and the sustainable use of organic amendments for improving crop productivity under stress conditions

Dr. Qazi is a rising authority who promises to leverage his deep understanding of biochar to create safer, more fertile, and resilient agricultural landscapes around the world. His work directly answers the global demand for science-based, sustainable solutions to environmental challenges. Dr. Qazi is a rising authority who promises to leverage his deep understanding of biochar to create safer, more fertile, and resilient agricultural landscapes around the world. Researchers like Dr. Qazi Shoaib Ali represent the future voice for biochar research groups worldwide and let’s explore the insights he brings to the field.

Shanthi Prabha:  Your profile highlights a specialty in biochar. What first sparked your personal or academic interest in this specific material?

Dr. Qazi Shoaib: My interest in biochar began when several students in our Environmental Horticulture Laboratoryat the University of Agriculture, Peshawar, were experimenting with it for soil improvement and remediation of heavy metals. Their results were promising, but they applied it at very high rates up to 9% which made it uneconomical for local farmers due to the high cost of biochar production through pyrolysisPyrolysis is a thermochemical process that converts waste biomass into bio-char, bio-oil, and pyro-gas. It offers significant advantages in waste valorization, turning low-value materials into economically valuable resources. Its versatility allows for tailored products based on operational conditions, presenting itself as a cost-effective and efficient More. This limitation sparked my curiosity to find a way to make biochar use more practical and affordable. I became motivated to explore how lower doses of biochar, when combined with organic fertilizers like farmyard manure, spent mushroom compost, and leaf mould, could achieve the same or even better results in soil remediation and crop performance.

SP:  Your doctoral research sounds fascinating focusing on biochar, tomatoes, and heavy metal-contaminated soil. Could you walk us through the main problem you were trying to solve in that study?

QS: The main problem my doctoral research aimed to solve was the heavy metal contamination of agricultural soils, which poses serious threats to both environmental health and human wellbeing. Due to industrialization and urbanization, toxic metals accumulate in soils and are absorbed by crops like tomato, entering the human’s food chain. While biochar is known for its ability to immobilize heavy metals and improve soil fertility, its high cost and the need for large quantities limit its use by farmers. My research therefore focused on developing a cost-effective and sustainable remediation strategy by using low biochar concentrations in combination with locally available organic fertilizers, which not only reduced heavy metal uptake but also improved plant growth, yield, and soil health.

SP:  For our readers who might not be soil scientists, how exactly does biochar work to remediate the soil and “mitigate heavy metal contamination,” as your research describes?

QS: Biochar works like a natural sponge and filter for contaminated soil. It is a carbon-rich material produced by heating organic matter (such as crop residues or wood waste) under limited oxygen conditions. This process gives biochar a highly porous structure and large surface area, which allows it to adsorb and hold heavy metals such as lead, cadmium, and zinc on its surface. In addition, biochar carries functional groups and mineral cations that can bind with heavy metals, making them less mobile and less available for plant uptake. This means that when biochar is mixed into contaminated soil, it immobilizes toxic metals, preventing them from entering plant roots or moving into groundwater.

In my research, when biochar was used along with organic fertilizers, the organic matter further enhanced soil microbial activity and improved soil structure, creating a healthier root environment. Together, they not only reduced heavy metal contamination but also improved soil fertility, plant growth, and fruit quality a win-win for both the environment and agriculture.

SP:  One of your publications mentions the “Synergistic Effect of Biochar and Organic Fertilizers.” In simple terms, what does that mean? Were you finding that they work better together than they do separately?

QS: The “synergistic effect” means that biochar and organic fertilizers worked better together than they did alone. In simple terms, each one helps the soil in a different way and when combined, their effects reinforce each other. Biochar improves soil structure and acts like a sponge, binding and locking up heavy metals while also improving aeration and water retention. Organic fertilizers such as farmyard manure, spent mushroom compost, and leaf mould add nutrients and organic matter, stimulating beneficial microbes and root activity.

When applied together, biochar provides a stable base for nutrients and microbes from the organic fertilizers, so plants can absorb them more efficiently. This partnership resulted in stronger tomato growth, higher yields, better fruit quality, and lower heavy-metal accumulation than using either amendment alone. In my study, the best results came from 2% biochar combined with 3% farmyard manure or 3% spent mushroom compost, clearly showing that the two materials work synergistically to make contaminated soil healthier and more productive.

SP:  What was the most surprising or unexpected result you found when you analyzed the tomato growth and fruit quality in your biochar experiments?

QS: The most surprising result was how small doses of biochar, when combined with organic fertilizers, produced remarkably strong improvements in tomato growth and fruit quality even better than using higher doses of biochar alone.

Initially, we expected that more biochar would give better results, but the study showed that just 2% biochar, especially when combined with 3% farmyard manure or 3% spent mushroom compost, delivered the highest yields, better fruit firmness, and superior nutritional quality (ascorbic acid, lycopene, and phenolic content etc). Another unexpected finding was that this low-dose combination not only improved yield and quality but also significantly reduced heavy metal accumulation in the fruits, keeping them well within WHO permissible limits. This proved that an economical and eco-friendly solution could outperform the more expensive, high-biochar approaches used in earlier studies.

SP: You also have practical experience as an Agriculture Engineer in the UAE, working in an arid environment. Did you apply biochar there, and does its effectiveness change in that kind of climate?

QS: My work experience as an Agriculture Engineer in the UAE was mainly focused on landscape design, plant selection, and maintenance in arid environments. In that specific role, I did not apply biochar or organic fertilizers, as the work was centered on aesthetic and functional landscaping rather than soil remediation or crop production.

However, working in the UAE’s harsh and dry conditions helped me understand the importance of soil improvement and water retention, which are key challenges in desert landscapes. From a scientific point of view, biochar has great potential in such climates because of its ability to hold water, improve sandy soil structure, and enhance nutrient retention. Although I didn’t use it during that particular job, I believe biochar could play a vital role in improving soil sustainability in arid regions like the UAE.

SP: Based on your 7+ years of experience, what is the biggest challenge or misconception people have when it comes to applying biochar in a real-world farm or nursery setting?

QS: One of the biggest misconceptions I have observed is that biochar is a ‘magic soil amendment’ that will automatically increase crop yield regardless of context. In reality, its effectiveness is highly dependent on the type of biochar, the feedstockFeedstock refers to the raw organic material used to produce biochar. This can include a wide range of materials, such as wood chips, agricultural residues, and animal manure. More it’s made from, the application rate, soil type, and the crops being grown.

Another challenge in real-world farm or nursery settings is proper integration with other organic or mineral fertilizers. Many growers either over-apply biochar, thinking more is better, or apply it without accounting for nutrient binding properties, which can temporarily immobilize some nutrients. Successful use requires careful planning often combining biochar with organic fertilizers like FYM, compost, or specific nutrient amendments to improve soil structure, water retention, and nutrient availability without negatively impacting crop growth. In short, while biochar has great potential, its benefits are context-specific, and practical guidance is essential to avoid disappointment.

SP: You’ve used advanced tools like Atomic Absorption Spectrophotometry to analyze your results. What did this technology allow you to see about heavy metal uptake that you couldn’t see with the naked eye?

QS: Atomic Absorption Spectrophotometry (AAS) allowed me to precisely quantify the concentration of heavy metals like cadmium, lead, and zinc in both soil and tomato plant tissues. These metals are invisible to the naked eye, and their accumulation can’t be assessed through plant appearance alone because plants might look healthy while still containing harmful levels of metals.

Using AAS, I could detect even trace amounts, track how different treatments like biochar and organic fertilizers affected metal uptake, and determine which combinations minimized heavy metal accumulation in edible parts of the tomato. Essentially, it provided a clear measurable link between soil amendments and food safety, something visual observation could never reveal.

SP: If a farmer or horticulturist listening today wants to start experimenting with biochar to improve their soil, what is the single most important piece of advice you would give them?

QS: The single most important piece of advice I would give is: start small and know your soil. Biochar’s effectiveness depends heavily on your soil type, crop, and the biochar’s properties. Begin with a small test plot, combine biochar with suitable organic fertilizers, and monitor how it affects soil structure, nutrient availability, and plant growth over a season. This approach helps avoid over-application, prevents nutrient imbalances, and allows you to see real benefits before scaling up to the whole farm or nursery.

SP: Finally, for our readers who are inspired by your research, where is the best place for them to find your publications and follow your professional work online?

QS: Readers can explore my research publications on biochar, organic fertilizers, and sustainable horticulture through the following professional platforms:

• Google Scholar: Access my complete bibliography and citation metrics here
• ResearchGate: Find and download my full-text papers on biochar and soil remediation

I also share insights and updates about my work and sustainable agriculture practices on LinkedIn, where professionals and enthusiasts can connect, discuss, and stay updated with the latest developments.