The researchers found that the combined treatment reduced cumulative ammonia volatilization by 27.1 percent compared with conventional urea fertilization during a complete rice-wheat rotation. The result is particularly notable because the amended organic fertilizer was applied with a 30 percent reduction in mineral nitrogen input, yet crop productivity was largely maintained. The findings point toward a potential strategy for making fertilizer use more efficient without simply asking farmers to apply less and accept lower yields. Instead, the approach aims to control what happens to nitrogen after it enters the soil.

“Reducing fertilizer input is only useful if farmers can maintain crop production at the same time,” said corresponding author Haijun Sun. “Our results suggest that combining biochar with dicyandiamide in organic fertilizer can help balance these goals by retaining nitrogen, limiting ammonia losses, and supporting crop growth.” That balance is central to the global fertilizer challenge. Nitrogen is indispensable for plant proteins, chlorophyll, and growth, but when it is converted into gaseous ammonia and lost from farmland, farmers may need to spend more on replacement fertilizer while nearby communities and ecosystems absorb the pollution.

The experiment covered two complete rice and wheat rotations from 2022 to 2024 in greenhouse soil columns. The researchers compared conventional urea fertilization with three treatments that used lower amounts of mineral nitrogen: conventional organic fertilizer, organic fertilizer amended with biochar, and organic fertilizer containing both biochar and dicyandiamide. The soil-column design allowed the team to monitor nitrogen movement and ammonia emissions under controlled conditions over successive crop seasons. Unlike a short laboratory test, the two-year rotation captured repeated changes in soil chemistry, crop uptake, and fertilizer behavior across both flooded rice and relatively dry wheat production.

Among the treatments, the combination of biochar and dicyandiamide produced the most consistent result. Across the full rotation, it was the only organic fertilizer treatment that significantly reduced cumulative ammonia emissions compared with conventional urea. Biochar alone reduced cumulative ammonia volatilization by 5.9 percent compared with conventional organic fertilizer, while adding both biochar and dicyandiamide achieved a much larger 33.6 percent reduction relative to that treatment. These results suggest that the two amendments may work through complementary mechanisms rather than simply adding the same effect twice.

Biochar is a carbon-rich material produced by heating biomass under oxygen-limited conditions. Its porous structure can alter soil water retention, nutrient adsorption, and the chemical environment surrounding fertilizer particles. In this study, the researchers linked biochar application to better regulation of ammonium concentrations and pH in the soil and the floodwater covering rice. This matters because ammonia volatilization is strongly influenced by the balance between ammonium ions and dissolved ammonia. Higher pH shifts more ammonium toward gaseous ammonia, making it easier for nitrogen to escape. By moderating this chemical environment, biochar may help keep nitrogen in a less volatile form for longer.

Dicyandiamide, commonly known as DCD, is a nitrification inhibitor that slows the microbial conversion of ammonium into nitrite and nitrate. That process can be beneficial under some conditions because plants can absorb nitrate, but rapid nitrification can also increase the risk of nitrogen leaching and nitrous oxide production. By delaying the transformation, DCD may extend the period during which ammonium remains available for plant uptake or retention in the soil. The researchers observed altered nitrogen transformation patterns in the amended treatment, indicating that the inhibitor helped reshape the timing and pathways of nitrogen cycling rather than merely reducing one isolated emission.

The study also examined soil bacteria and found that biochar-containing fertilizers reduced the abundance of Nitrospirota, a bacterial group associated with nitrite oxidation, one of the key steps in nitrification. The shift suggests that the amendments may change the microbial niches involved in nitrogen conversion by modifying factors such as pH, moisture, carbon availability, and nutrient distribution. However, the researchers emphasize that their microbial analysis was based on taxonomic profiling. Detecting changes in the abundance of a bacterial group does not directly prove that a particular organism performed a specific biochemical function, so future work using functional genes, enzyme measurements, and isotope tracing will be needed to confirm the mechanisms.

The environmental gains did not appear to come at the expense of another major greenhouse gas. Cumulative nitrous oxide emissions showed no significant differences among the fertilizer treatments, an important finding because strategies that suppress ammonia can sometimes redirect nitrogen losses into other pathways. The combined treatment also maintained rice yields at levels comparable with conventional fertilization, while conventional organic fertilizer and biochar-only organic fertilizer reduced rice grain yields. The researchers estimated through Monte Carlo simulations that the combined treatment could generate potential benefits of approximately 36,600 Chinese yuan per hectare per year under the experimental conditions, reflecting fertilizer savings and reduced nitrogen-related environmental and health costs.

The result is promising, but it is not yet a universal prescription for farmers. The experiment was conducted in controlled soil columns rather than commercial fields, where rainfall, temperature swings, soil types, irrigation practices, fertilizer placement, and management decisions can vary dramatically. The economic estimate also depends on local fertilizer prices, crop yields, pollution costs, and the availability and quality of biochar and dicyandiamide. Field-scale trials will be essential to determine whether the ammonia reductions persist under real farming conditions and whether the treatment remains affordable and practical across different rice-wheat systems. Even with those limitations, the study offers a striking example of how combining carbon-based soil amendments with targeted nitrogen management could help turn fertilizer from a major source of pollution into a more efficient tool for feeding a growing population.

Subject of Research: Nitrogen fertilizer efficiency, ammonia volatilization, biochar, dicyandiamide, soil nitrogen cycling, and rice-wheat crop production

Article Title: Ammonia mitigation and economic gains from dicyandiamide and biochar-amended organic fertilizer: a 2-year rice-wheat rotation study

News Publication Date: 22-Jun-2026

Web References: https://doi.org/10.48130/aee-0026-0016; Agricultural Ecology and Environment

References: Huang W, Wang L, Gong X, Bian R, Lu X, et al. 2026. “Ammonia mitigation and economic gains from dicyandiamide and biochar-amended organic fertilizer: a 2-year rice-wheat rotation study.” Agricultural Ecology and Environment 2: e019. DOI: 10.48130/aee-0026-0016

Image Credits: Wang Huang, Lisha Wang, Xueliu Gong, Rongjun Bian, Xinyue Lu, Yuanqing Bu, Yunyi Liang, Haijun Sun, Yanfang Feng, Changlei Xia, Jiang Jiang, and Lihong Xue

Keywords: ammonia volatilization, biochar, dicyandiamide, organic fertilizer, nitrogen fertilizer, nitrogen cycling, rice-wheat rotation, soil microbiome, nitrification inhibition, sustainable agriculture, crop productivity, agricultural pollution

At the core of the research lies the intricate balance between the undeniable agronomic benefits of plastic mulch films and the mounting ecological concerns stemming from plastic waste accumulation, soil contamination, and microplastic proliferation. By aggregating data across diverse agroecological zones, crop types, and management protocols, the study robustly quantifies yield improvements linked to mulch usage, while simultaneously mapping the environmental cost metrics that have heretofore received less systematic scrutiny. This integrative approach fills a critical knowledge void, equipping policymakers, agronomists, and sustainability experts with data-driven pathways to mitigate negative externalities without sacrificing productivity.

Plastic mulch fundamentally functions by creating an optimized soil environment—retaining moisture, suppressing weed growth, stabilizing temperature fluctuations, and improving nutrient use efficiency—all factors that synergistically culminate in enhanced plant growth and output. The meta-analysis highlights that, on average, crop yields under plastic mulch regimes increase by approximately 35-50% compared to non-mulched controls, with some crops exhibiting even higher percentage gains depending on climatic and soil conditions. These statistics shed light on why plastic mulch has been so widely adopted, particularly in water-scarce and semi-arid regions, where efficient water use is paramount.

Nevertheless, the environmental consequences linked to conventional polyethylene-based plastic mulches are profound and multifaceted. The study elucidates mechanisms through which plastic residues fragment into microplastics, infiltrating soil profiles and potentially entering terrestrial food webs. Prolonged soil contamination alters microbial community structures, diminishing soil health and fertility—paradoxically undermining the very productivity gains plastic mulch originally promises. Moreover, improper disposal and residual plastic accumulation exacerbate agricultural pollution, contributing to protracted ecosystem degradation and raising global concerns about the sustainability of this practice.

To address these sustainability conundrums, the authors delve into emerging alternatives and innovations that offer comparative benefits without the entrenched environmental drawbacks. Biodegradable mulch films stand out as a promising candidate, capable of degrading into harmless organic matter post-use, thereby minimizing persistent pollution. The meta-analysis assesses their agronomic performance across multiple studies, revealing that while biodegradable mulches deliver slightly lower yield increments relative to conventional plastics, they confer significant environmental advantages that warrant their broader adoption. This tradeoff underscores the complexity of balancing efficiency and ecological responsibility in contemporary agriculture.

A particularly novel contribution of the study is its holistic evaluation framework that incorporates both productivity metrics and sustainability indices, spanning soil health parameters, carbon footprints, plastic residue accumulation, and economic viability. This multi-dimensional assessment exposes regional disparities where plastic mulch benefits outweigh environmental costs and vice versa, providing tailored recommendations for stakeholders. For example, in temperate regions with intensive cropping systems, conventional plastic mulch’s environmental risks necessitate urgent shifts towards greener alternatives, whereas in certain tropical zones, the priority remains maximizing yields amidst pressing food security concerns.

The research further discusses the critical importance of incorporating end-of-life management strategies for plastic mulches to close the loop in plastic use. Innovations in recycling technologies, incentive-based collection programs, and farmer education on environmentally sound disposal practices emerge as pivotal elements that could dramatically reduce plastic residue build-up in agricultural soils. Coupling such waste management protocols with regulatory frameworks is imperative to curtail the escalating ecological footprint of plastic mulching practices at scale.

From a mechanistic perspective, the study scrutinizes soil-microbe interactions under different mulching materials, revealing that biodegradable mulches tend to foster more resilient and diverse microbial ecosystems compared to conventional plastics. This microbial vitality is essential for nutrient cycling, disease suppression, and overall soil regenerative capacity, which are fundamental to long-term agricultural sustainability. These findings advocate for the prioritization of mulch materials that not only protect crops but also nurture ecosystem functions critical for sustained productivity.

Economic assessments presented in the meta-analysis add another crucial layer to the conversation. While plastic mulch adoption demonstrably enhances crop revenues due to higher yields and potential water savings, upfront costs, and material lifecycle expenses vary significantly depending on mulch type and local infrastructure. Policymakers and extension services thus face the complex challenge of devising subsidy schemes and support mechanisms that encourage sustainable mulch usage without imposing undue financial burdens on farmers, particularly those in resource-limited settings.

In conclusion, Wang et al.’s meta-analysis offers a pioneering synthesis underscoring the dual imperatives of productivity enhancement and environmental stewardship within the context of plastic mulch agriculture. The study advocates for a nuanced, region-specific approach combining innovative biodegradable materials, effective waste management, and informed agronomic practices. This integrated framework not only preserves the notable yield augmentation benefits but also significantly alleviates environmental risks such as soil plastic contamination and microplastic infiltration. Ultimately, this research charts a decisive course toward achieving an eco-friendly agricultural paradigm capable of supporting global food security sustainably.

The implications of this study resonate far beyond academic discourse, prompting urgent dialogues among agricultural stakeholders, manufacturers, policymakers, and environmental organizations globally. The compelling evidence pinpointing critical leverage points offers a foundation for policy reforms geared toward sustainable plastic use in agriculture, fostering circular economy models, and prioritizing research into next-generation, eco-conscious agricultural inputs. As the world grapples with the intertwined challenges of climate change, soil degradation, and rising food demand, this seminal work provides a beacon of scientifically grounded hope for reconciling productivity with planetary health.

Furthermore, the research invites future inquiries into the long-term ecological trajectories of plastic mulch residues, exploring soil carbon dynamics, trophic transfer of microplastics, and potential bioaccumulation in crops destined for human consumption. Such avenues promise to deepen our understanding of the systemic impacts that current practices imprint on agroecosystems. Concurrently, advancements in biodegradable polymer chemistry and mulch formulation stand as essential complementary priorities evolving from this foundational meta-analytical evidence.

In sum, this meticulous global evaluation transforms the narrative around plastic mulching from a simplistic productivity enhancer to a complex, multi-stakeholder challenge demanding integrative solutions. The proposed eco-friendly framework elegantly balances high-yield aspirations with ecological integrity imperatives, charting a forward-thinking paradigm unique in its scope and impact. It is a clarion call for the agriculture sector’s rapid evolution toward sustainability, underscoring that future farming success hinges not merely on technological adoption, but on harmonizing innovation with environmental resilience.

Subject of Research: The study examines the tradeoffs between productivity gains and environmental sustainability of plastic mulch usage in agriculture through a global meta-analysis.

Article Title: Plastic mulch productivity-sustainability tradeoffs and pathways toward an eco-friendly framework: insights from a global meta-analysis.

Article References:
Wang, L., Guo, S., Ge, T. et al. Plastic mulch productivity-sustainability tradeoffs and pathways toward an eco-friendly framework: insights from a global meta-analysis. Nat Commun (2026). https://doi.org/10.1038/s41467-026-68798-2

Image Credits: AI Generated

Every agricultural season generates an enormous volume of crop residues such as straw, husks, and stalks. Traditional disposal practices—incineration, incorporation into soil, animal feed, or composting—while familiar and widespread, inadvertently release significant amounts of greenhouse gases including methane (CH₄), nitrous oxide (N₂O), and carbon dioxide (CO₂). These emissions exacerbate global warming and jeopardize future food production systems by degrading soil quality and altering ecosystem balances. Against this backdrop, the repurposing of biomass waste into biochar emerges as a paradigm-shifting solution with multifaceted environmental benefits.

Biochar production relies on pyrolysis, a thermochemical conversion process carried out under controlled, low-oxygen conditions. This process stabilizes carbon within the biomass, creating a porous, recalcitrant charcoal-like material. When biochar is integrated into soils, its unique physicochemical properties enhance nutrient retention, water holding capacity, and microbial habitat quality. Furthermore, biochar’s inherent stability means it acts as a long-term carbon sink, sequestering CO₂ that would otherwise contribute to atmospheric greenhouse gas concentrations.

The research team, under the guidance of Professors YAN Xiaoyuan and XIA Longlong from the Institute of Soil Science at the Chinese Academy of Sciences, conducted a meta-analysis of 438 field trials, inclusive of 29 with continuous, multiyear data. Their comprehensive examination—a rigorous synthesis of experimental field data across diverse ecosystems and management regimes—confirms that annual biochar applications sustained over a minimum of four years yield substantive agronomic and climatic dividends. Notably, crop yields increased on average by 10.8%, while methane and nitrous oxide emissions declined by 13.5% and 21.4%, respectively, underscoring biochar’s dual capacity to enhance food production and reduce potent greenhouse gases.

One of the pivotal insights from this study revolves around the temporal dimension of biochar’s efficacy. While single, isolated biochar applications do contribute positively to soil carbon stocks and emission reductions, their benefits wane over time due to the material’s aging and degradation dynamics. In contrast, repeated, systematic applications not only preserve but amplify biochar’s functional advantages. This finding suggests a critical need for management strategies incorporating periodic biochar replenishment to sustain ecosystem services and ensure maximal long-term impact.

The capacity of biochar to augment soil organic carbon (SOC) by over 50% is particularly consequential, given SOC’s central role in soil fertility, structure, and microbial activity. By improving SOC content, biochar directly enhances soil resilience against erosion, drought, and nutrient depletion. Simultaneously, the ability to suppress methane and nitrous oxide emissions tackles two of the most potent greenhouse gases, providing a scalable agricultural mitigation pathway that complements fossil fuel emission reduction efforts.

Estimating biochar’s global impact, the researchers projected that diverting 70% of crop straw residues into biochar production could augment annual global grain yields by approximately 190 million tons. This represents a substantial food security advance, equivalent to about 30% of China’s average grain output in recent years. Moreover, the corresponding carbon dioxide removal potential—that is, the net sequestration effect after accounting for emissions from biochar manufacture—reaches an impressive 1.84 petagrams of CO₂-equivalent per year. This quantum of carbon offset equals nearly 4.6% of the world’s fossil fuel CO₂ emissions, a significant contribution to climate mitigation goals.

Economic viability remains a critical factor influencing biochar’s adoption at scale. Initial production and application costs pose tangible barriers, especially for risk-averse farmers in both developed and developing regions. However, the study’s cost-benefit analysis reveals that yield increases and emission reductions recuperate approximately 81% of these upfront expenditures. When factoring in additional nitrogen conservation benefits, the financial outlook is even more favorable. To realize this potential, policy instruments including targeted subsidies, extension services, and demonstration projects are indispensable.

The authors emphasize the necessity for localized, adaptive biochar application regimens. Soil type, climate, cropping system, and regional agronomic practices collectively modulate biochar’s performance. Therefore, building a diverse evidence base through extensive multi-environmental field trials is essential to optimize application timing, frequency, and dosages. Strategic deployment—possibly involving multi-year intervals and rest phases—could maximize biochar’s cost-effectiveness and ecological benefits while minimizing risks such as accumulation of potentially harmful substances.

Leading voices in the research collective advocate for concerted collaboration between scientists, policymakers, and agricultural stakeholders to unlock biochar’s full potential. Large-scale demonstration trials across critical grain-producing regions including the North China Plain and the U.S. Corn Belt would generate compelling evidence to drive farmer uptake. Such initiatives are crucial to overcoming economic hesitancy, promoting knowledge dissemination, and integrating biochar into mainstream sustainable agriculture frameworks.

Biochar’s implications extend beyond carbon and yield metrics, touching upon broader agroecological and socioeconomic dimensions. By transforming waste streams into valuable soil amendments, biochar production contributes to circular economy principles, reduces open-air biomass burning, and mitigates local air pollution. Moreover, its capacity to enhance soil health supports biodiversity, improves water quality, and strengthens farm resilience against climate-induced shocks, thus fortifying rural livelihoods.

In sum, this landmark study confirms that biochar is not merely an ancillary soil additive but rather a game-changing agent for sustainable agriculture and climate action. Its dual ability to catalyze food security improvements while delivering measurable greenhouse gas reductions resonates strongly with global priorities under the Sustainable Development Goals (SDGs), particularly SDG 2 (Zero Hunger) and SDG 13 (Climate Action). With informed deployment and robust support structures, biochar stands poised to redefine the agricultural landscape in the coming decades.

As the international community grapples with intertwined environmental and food crises, such integrative research offers a beacon of innovation and hope. The path forward demands multidisciplinary collaborations, policy foresight, and farmer-centric approaches to mainstream biochar technologies. When leveraged wisely, biochar’s long-term benefits could transform agrosystems worldwide, steering humanity toward a more secure and sustainable future.

Article Title: Sustained benefits of long-term biochar application for food security and climate change mitigation

News Publication Date: 11-Aug-2025

Web References:
https://doi.org/10.1073/pnas.250923712

Image Credits: YAN Xiaoyuan’s team

Keywords:
Organic farming, Food security, Climate change mitigation, Crop yields, Soil respiration, Sustainable agriculture

The research encompassed 17 commercial farms in southern England, employing a robust experimental framework that contrasted three distinct agricultural systems. The baseline, or business-as-usual approach, reflected conventional intensive agriculture devoid of ecological enhancements. An intermediate or ‘enhanced’ ecological system implemented wildflower field margins alongside overwintering cover crops designed for nutrient retention and carbon sequestration in soils. The most ambitious, or ‘maximised’ ecological system, integrated all measures from the enhanced setup, additionally planting in-field wildflower strips and applying organic amendments such as farmyard manure to enrich soil health.

Results dramatically underscored the symbiotic relationship between biodiversity and crop productivity. Both ecological systems fostered substantial increases in abundance and diversity of earthworms, pollinators—including bees and hoverflies—and natural predator arthropods such as ladybirds and lacewings. Such biological enrichment translated into significant reductions in pest populations, particularly aphids and gastropod mollusks, culminating in enhanced pollination services that elevated seed set and yield in flowering crops like oilseed rape.

Soil health indicators corroborated these ecological benefits, with higher levels of soil organic carbon recorded in agroecologically managed fields. Improved soil structure, nutrient cycling, and enhanced microfaunal activity further augmented crop resilience and productivity. Notably, the intermediate enhanced system achieved profitability on par with intensive agriculture, but this equilibrium hinged on the availability of agri-environmental subsidies to offset initial investments and habitat establishment costs.

The maximised system, while delivering even greater ecological and yield benefits, generally incurred higher operational costs. In most cases, financial viability demanded elevated subsidies, although exceptions arose in farms with existing access to organic inputs like manure, which mitigated expenditure. These findings emphasize the crucial role of fiscal incentives in facilitating farm transitions toward sustainability by mitigating short-term economic constraints.

Crucially, the lead ecologist Dr. Ben Woodcock highlighted the policy implications of the study. Without strategic financial mechanisms to reward ecological stewardship, many farmers may be reluctant to forsake entrenched intensive methods. Such reticence risks perpetuating systems vulnerable to pesticide resistance, soil degradation, and climate instability. Conversely, fostering agroecological practices promises to ‘future-proof’ farms by enhancing soil vitality, reducing chemical dependencies, and building resilience against environmental perturbations.

Co-author Professor Jonathan Storkey from Rothamsted stressed the dual advantage of wildlife-friendly management for agricultural landscapes. The ecosystem services—pollination, pest regulation, and soil enhancement—cultivated by agroecological practices represent sustainable substitutes for synthetic agrochemicals, aligning food security with environmental conservation imperatives. Yet the narrow profit margins typical in modern farming underscore the necessity for tailored support measures as input costs escalate globally.

Beyond financial frameworks, the study illuminated the importance of farmer education and experiential learning in optimizing habitat quality. Training programs empowered producers to establish and maintain wildlife-supportive habitats effectively, maximizing benefits for beneficial insect populations. Prior research by UKCEH corroborated that such capacity building elevates the ecological function of field margins, thereby amplifying pest control and pollination services.

This multi-institutional study formed part of a larger collaborative network spanning government, academia, and industry, integrated under research initiatives like the ASSIST and AgZero+ programs. Funded by prominent bodies including the Natural Environment Research Council and the Biotechnology and Biological Sciences Research Council, the work embodies cutting-edge efforts to reconcile agricultural productivity with ecological integrity at landscape scales.

As global agriculture grapples with escalating environmental and economic challenges, these findings underscore a pivotal paradigm shift. Agroecological farming, underpinned by supportive policy, scientific insight, and practical skill development, emerges as a viable pathway to simultaneously bolster biodiversity, enhance crop yields, and safeguard farm livelihoods in an uncertain climatic future.

Farmers, policymakers, and conservationists alike are urged to consider these insights when envisioning sustainable food systems. Grounding agricultural innovation in ecological processes not only underwrites ecosystem resilience but also advances the urgent agenda of feeding a growing global population within Earth’s planetary boundaries.

Subject of Research: Agroecological farming practices and their impacts on biodiversity, crop yield, and farm profitability.

Article Title: Agroecological farming promotes yield and biodiversity but may require subsidy to be profitable

News Publication Date: 1 July 2025

Web References:
https://besjournals.onlinelibrary.wiley.com/doi/10.1111/1365-2664.70079

References:
Woodcock et al. 2025. Agroecological farming promotes yield and biodiversity but may require subsidy to be profitable. Journal of Applied Ecology. DOI: 10.1111/1365-2664.70079

Image Credits: UK Centre for Ecology & Hydrology (UKCEH)

Keywords: Sustainable agriculture, agroecology, biodiversity, pollination, pest control, soil carbon, crop yield, ecosystem services, ecological restoration, insecticide resistance, agroecosystems, conservation ecology