Advances in organic resources utilization for agriculture: A comprehensive review

Introduction

Global agriculture faces the dual imperative of meeting rising food demands while simultaneously curtailing its environmental footprint. Mounting concerns over declining soil fertility, escalating Greenhouse Gas (GHG) concentrations, and the ecological costs of synthetic fertilizer dependency have brought the sustainable management of organic resources to the forefront of agricultural science (Lal, 2004; Reganold and Wachter 2016) [16,29] . Organic materials -encompassing compost, farmyard manure, crop residues, biofertilizers, and animal wastes -have historically been valued for their capacity to improve soil fertility and support plant growth. In recent years, however, scientific and technological progress has substantially transformed the processing, application, and integration of these resources within modern farming systems (Gattinger et al. 2012; Bünemann et al. 2018) [11,7] . The agricultural sector is under continuous pressure to satisfy rising food demands while simultaneously reducing environmental impacts. Among the most promising yet insufficiently deployed strategies is the sustainable management of organic resources such as livestock manure, composts, biosolids, and recycled organic matter. These materials are rich in essential nutrients and organic matter that, when appropriately managed, improve soil fertility, reduce dependence on synthetic fertilizers, and strengthen ecosystem services (Mäder et al. 2002; Lal 2015) [21,17] . Conversely, mismanagement of organic inputs is associated with significant environmental concerns, including gaseous emissions of ammonia (NH₃), nitrogen oxides (NOₓ), and nitrous oxide (N₂O), as well as nutrient leaching into water bodies and microbial contamination of aquatic ecosystems (Reay et al. 2012) [28] . Unlike previous reviews that primarily focused on nutrient management or organic farming systems in isolation, the present review integrates emission mitigation, water quality protection, soil restoration, advanced monitoring technologies, and policy frameworks within a unified perspective on organic resource management. A particular emphasis is placed on multiscale integration -spanning field trials, watershed-level assessments, and continental modelling -and climate-smart approaches designed to support sustainable agricultural intensification.

Scope and rationale

The utilization of organic resources in agriculture is a crossdisciplinary subject that intersects agronomy, environmental science, soil microbiology, hydrology, and agricultural policy. To comprehensively evaluate the agronomic and environmental consequences of organic resource use, research must integrate data across both spatial and temporal dimensions. Farm and watershed-level investigations facilitate assessment of cumulative impacts on water quality and GHG emissions, while modelling approaches and remote sensing technologies at regional and continental scales help extrapolate findings, evaluate scalability, and support policy formulation (Kalogeras et al. 2025; Bhattacharyya et al. 2018) [15,5] . The integration of multiscale datasets and methodologies is therefore crucial for addressing environmental trade-offs and developing adaptive, science-based regulatory frameworks.

Objectives

This review compiles interdisciplinary research and synthesis efforts focused on improving knowledge related to the sustainable use of organic resources in agroecosystems. The primary objectives are: 1) To investigate mechanisms and mitigation measures for gaseous emissions from organic resource use, including emission factors under diverse climates, soil conditions, and application techniques; 2) To evaluate novel measurement and monitoring techniques -sensor-based technologies, micrometeorological systems, isotopic tracing, and remote sensing -for quantifying gaseous emissions and nutrient flows; 3) To assess the impacts of organic resource management on water quality and soil health, with emphasis on nutrient cycling, carbon sequestration, and microbial activity; and 4) To analyse relevant policy and regulatory frameworks, identifying opportunities for harmonization and governance improvements across regions.

Measurement and monitoring techniques

Accurate quantification of gaseous emissions, nutrient losses, and environmental impacts associated with organic resource use is essential for designing effective mitigation strategies and supporting evidence-based policymaking. During the past two decades, major advances have been achieved in measurement technologies, analytical instruments, and modelling tools that enable detailed monitoring of emission behaviour and nutrient dynamics across various spatial and temporal scales (Bhattacharyya et al. 2018; Lal, 2015) [5,17] .

Emission monitoring

The release of nitrogen-related gases from organic amendments creates both environmental and regulatory challenges. Monitoring these emissions requires highly sensitive, reliable, and scalable techniques capable of operating under variable field conditions. High-resolution spectroscopic methods -including Photoacoustic Spectroscopy, Fourier-Transform Infrared (FTIR) Spectroscopy, and Cavity Ring-Down Spectroscopy (CRDS)have become the standard for laboratory and semi-field investigations, offering real-time quantification of NH₃, NOₓ, and N₂O at sub-part-per-billion concentrations. Open-path laser systems extend these capabilities to large-scale spatial monitoring with minimal ecosystem disturbance, while portable electrochemical sensors have made in situ assessment feasible in remote and resource-limited locations (Bhattacharyya et al. 2018) [5] . Environmental integration is equally important: weather stations and soil probes recording soil temperature, moisture, wind patterns, and air pressure are routinely deployed alongside gas-measurement systems to capture the environmental drivers of emission variability. Despite these advances, emission factors remain highly context-dependent, scaling from plot to landscape continues to be methodologically challenging, and the need for cost-effective and reliable monitoring technologies persists. Table 1 summarizes the principal emission monitoring techniques, their target gases, advantages, and limitations with supporting references. [5] FTIR spectroscopy NH₃, NOₓ, N₂O, CH₄

Multi-gas simultaneous detection; no consumables

Expensive; large instrument footprint Reay et al., (2012) [28] Cavity Ring-Down Spectroscopy (CRDS) N₂O, CH₄, CO₂ Sub-ppb precision; stable over long deployments High capital cost Bhattacharyya et al., (2018) [5] Open-path laser systems NH₃, N₂O, CH₄ Large-area non-invasive spatial monitoring

Complex calibration; weathersensitive Kalogeras et al., (2025) [15] Electrochemical sensors NH₃, NOₓ Low-cost; portable; field-deployable Lower accuracy; sensor drift Bhattacharyya et al., (2018) [5] Micrometeorological methods Multiple GHGs Landscape-scale flux; minimal disturbance Requires steady atmospheric conditions Pretty et al., (2018) [27] Chamber-based methods N₂O, CH₄ Simple; widely applicable; low cost Small spatial footprint; disturbs soil Gattinger et al., (2012) [11] NH₃ = ammonia; NOₓ = nitrogen oxides; N₂O = nitrous oxide; CH₄ = methane; ppb = parts per billion; FTIR = Fourier-Transform Infrared; CRDS = Cavity Ring-Down Spectroscopy

Water-soil monitoring

In addition to atmospheric emissions, organic resource application strongly influences soil quality and water contamination risks, particularly through nutrient leaching and surface runoff (Lal, 2015; Hansen et al. 2001) [17,13] . Suction lysimeters and ceramic-cup samplers are extensively utilized for collecting soil solutions and quantifying nitrate and ammonium leaching, whereas runoff plots and flow-weighted samplers directly measure nutrient transport in surface water. Eventoriented monitoring, which captures pollutant movement during high-risk episodes such as rainfall immediately following amendment application, has proven especially informative for targeting management interventions. Soil hydrological monitoring relies on Time-Domain Reflectometry (TDR) and Frequency-Domain Reflectometry (FDR) for continuous soil moisture assessment, complemented by double-ring and minidisk infiltrometers to evaluate water infiltration rates. Penetrometers, aggregate stability analyses, and bulk density probes are further employed to characterize structural modifications caused by organic inputs (Glab and Kulig, 2008) [12] . At the microbial level, advanced molecular techniquesincluding quantitative PCR (qPCR) and metagenomicsfacilitate the tracking of microbial contaminants and antibiotic resistance genes, while isotopic tracer studies using ¹⁵N and ¹⁸O help differentiate nitrogen loss pathways (Lori et al. 2017) [20] .

Remote sensing and modelling

Although in situ measurements provide high precision, their spatial coverage is inherently limited. Remote sensing technologies and process-oriented models are increasingly employed to extend field-level observations to broader geographic scales. Satellite platforms such as Sentinel-2 and Landsat 8 deliver high-resolution imagery for monitoring crop growth, soil moisture, and crop residue cover (Kalogeras et al. 2025) [15] , while Unmanned Aerial Vehicles (UAVs) equipped with multispectral and thermal sensors offer finer spatial and temporal resolution. Vegetation indices such as the Normalized Difference Vegetation Index (NDVI) and Soil-Adjusted Vegetation Index (SAVI) are used to estimate nutrient status and field variability, and thermal imaging supports identification of moisture stress and zones vulnerable to leaching (Bhattacharyya et al. 2018) [5] . Process-based models -including DNDC, DayCent, and APSIM -simulate emissions, nutrient leaching, and crop productivity using site-specific environmental and management data, whereas hydrological models such as SWAT and HYPE evaluate water quality impacts at watershed and basin scales. Integration of remote sensing outputs with Geographic Information Systems (GIS) enables spatial visualization and hotspot mapping, and Bayesian inference methods are increasingly used to reduce uncertainty in model predictions. Collectively, these approaches support scenariodriven simulations under varying climate, soil, and policy conditions, which are invaluable for strategic planning and adaptive governance (Pretty et al. 2018) [27] .

Emission mitigation from organic resource use

The sustainable use of organic resources in agricultureincluding Farmyard Manure (FYM), compost, biochar, and green manure -offers dual benefits by enhancing soil productivity and contributing to climate change mitigation. However, improper management may increase emissions of GHGs, including methane (CH₄), N₂O, and NH₃ (Awasthi et al. 2020; Reay et al. 2012) [1,28] . Strategic management practices are therefore required to minimize these emissions while maintaining soil fertility and crop productivity.

Agronomic mitigation strategies

Agronomic approaches modify the soil-plant-atmosphere interactions that regulate GHG formation and nutrient cycling, primarily aiming to reduce emission hotspots, optimize microbial processes, and enhance soil carbon storage. Conservation agriculture -combining reduced tillage, residue retention, and crop diversification -represents one of the most widely studied and effective frameworks. No-till or reduced tillage conserves soil aggregates, minimizes oxidation of Soil Organic Carbon (SOC), and lowers fuel-related emissions from tillage operations (Lal, 2004; Gattinger et al. 2012) [16,11] . Crop rotation involving legumes or deep-rooted species increases biological nitrogen fixation and improves nutrient balance, thereby reducing dependency on synthetic fertilizers (Blanco-Canqui et al. 2015) [6] . Mulching through surface residue application enhances soil cover, regulates soil temperature and moisture, and creates microbial conditions that suppress N₂O emissions (Glab and Kulig, 2008) [12] . In paddy systems, Alternate Wetting and Drying (AWD) management has demonstrated CH₄ emission reductions of up to 85% compared to continuous flooding (Reay et al. 2012) [28] . Biocharproduced through biomass pyrolysis under low-oxygen conditions -is increasingly recognized for its capacity to mitigate GHG emissions when co-applied with organic amendments. A global meta-analysis by Zhong et al. (2025) [38] demonstrated an average reduction of approximately 54% in N₂O emissions when biochar was combined with manure or compost.

Organic amendments

Long-term application of FYM improves soil structure, nutrient retention, and emission mitigation when managed effectively (Smith et al. 2020; Lal, 2015) [31,17] . Composting converts raw organic materials into stabilized humic substances with substantially lower emission potential during field application (Awasthi et al. 2020) [1] . Compost application has been shown to increase SOM by up to 30% over multiple growing seasons, while concurrently enhancing microbial diversity and enzymatic activity. Green manuring -the cultivation and incorporation of cover crops, particularly legumes -increases in situ organic inputs, promotes biological nitrogen fixation, and reduces denitrification losses through balanced C:N ratios (Blanco-Canqui et al. 2015) [6] . Table 2 provides a comparative overview of key organic amendments, their soil benefits, GHG implications, and recommended best management practices. [31] ; Lal (2015) [17] Compost SOM +20-30%; microbial diversity

N₂O ↓ via N immobilization; lower CH₄ potential

Ensure C:N > 20; avoid overapplication Awasthi et al., (2020) [1] ; Gattinger et al., (2012) [11] Biochar SOC; CEC; water retention N₂O ↓ ~54% (meta-analysis); CH₄ ↓ Site-specific rates; feedstock selection Zhong et al., (2025) [38] ; Awasthi et al., (2020) [1]

Avoid anaerobic decomposition

Glab & Kulig (2008) [12] ; West & Post (2002) [37] Biosolids / sewage sludge Macro/micronutrients; organic matter

N₂O risk if N-rich; pathogen concerns

Composting or anaerobic treatment first Reay et al., (2012) [28] SOM = soil organic matter; SOC = soil organic carbon; WHC = water-holding capacity; BNF = biological nitrogen fixation; CEC = cation exchange capacity; C:N = carbon-to-nitrogen ratio; DOC = dissolved organic carbon; N₂O = nitrous oxide; CH₄ = methane; NH₃ = ammonia [13,30] . Organic resource management practices, when implemented efficiently, can reduce nutrient runoff, improve soil water retention, and decrease irrigation dependence, thereby offering significant hydrological cobenefits in addition to their agronomic value (Pretty et al. 2006) [26] .

Soil structure and water retention

One of the principal hydrological advantages of organic farming is the long-term enhancement of soil physical properties, which directly governs water movement and nutrient transport. Continuous incorporation of organic matter -including compost, crop residues, and green manure -improves soil aggregation and porosity (Lal, 2004; Bünemann et al. 2018) [16,7] . Wellaggregated soils exhibit higher infiltration capacity, thereby reducing runoff volume and limiting nutrient transport to adjacent water bodies. Organic matter also enhances soil water-holding capacity, which is particularly beneficial in semi-arid and arid environments (Glab and Kulig, 2008) [12] .

Reduction of nutrient leaching and chemical contamination

The exclusion of synthetic agrochemicals is a defining characteristic of organic farming systems and significantly contributes to reduced water contamination risks. Avoidance of synthetic nitrogen fertilizers reduces nitrate leaching, a major source of groundwater contamination (Hansen et al. 2001) [13] .

Lower phosphorus loading helps reduce eutrophication risks in freshwater environments (Sharpley et al. 1994) [30] . Organic systems further encourage closed-loop nutrient cycling through composting, green manuring, and on-farm recycling. Enhanced microbial activity and symbiotic associations -including mycorrhizal networks and nitrogen-fixing bacteria -improve biological nutrient uptake and further diminish leaching losses. Studies consistently report lower pesticide residues and synthetic contaminants in runoff from organically managed farms compared to conventional systems (Bengtsson et al. 2005) [4] . Table 3 summarizes the major organic management practices, their water quality benefits, potential risks, and recommended mitigation strategies. [13] ; Mäder et al., (2002) [21] Cover [12] Reduced / no-till Improved aggregation; reduced sediment and P loss

Potential herbicide accumulation if used transitionally

Combine with cover crops and organic inputs Lal (2004) [16] ; West & Post (2002) [37] [26] Biochar amendment Reduces P leaching; improves soil structure

Very low risk; may adsorb contaminants

Application rate and depth management Zhong et al., (2025) [38] ; Awasthi et al., (2020) [1] NO₃ = nitrate; P = phosphorus; N = nitrogen; DOC = dissolved organic carbon; C:N = carbon-to-nitrogen ratio 5 Impacts on soil quality Soil is a dynamic living system that underpins agricultural productivity and environmental sustainability. Decades of intensive conventional farming -characterized by excessive synthetic inputs, repeated tillage, and monocropping -have caused severe soil degradation manifested as reductions in SOM, biological activity, and ecosystem services including water retention, nutrient cycling, and carbon sequestration (Lal 2004; Tsiafouli et al. 2015) [15,34] . The application of organic resources offers an effective strategy for restoring degraded soils by improving their biological, physical, and chemical properties (Gattinger et al. 2012; Reganold and Wachter 2016) [11,29] .

Enhancement of soil organic matter and carbon sequestration

Soil organic matter forms the foundation of soil health by regulating nutrient retention, microbial activity, and physical stability. Long-term field studies have demonstrated SOM increases of up to 30% under organic management compared to conventional farming (Leifeld and Fuhrer, 2010; Gattinger et al. 2012) [19,11] . Organic amendments provide carbon-rich substrates that decompose gradually and form stable humic compounds, contributing to both short-term fertility and long-term carbon sequestration. Practices such as mulching, no-till farming, and cover cropping reduce decomposition rates and protect organic matter from oxidative loss (West and Post, 2002; Poeplau and Don, 2015) [37,25] .

Stimulation of microbial biomass and biological activity

Healthy soils rely on active and diverse microbial communities that regulate nutrient cycling, suppress soil-borne diseases, and drive organic matter decomposition. Organically managed soils generally contain 25-50% higher microbial biomass than conventionally managed soils (Lori et al. 2017; Banerjee et al. 2016) [20,2] . Continuous addition of organic substrates stimulates microbial metabolism and reproduction, creating a positive feedback between organic matter inputs and biological activity. The absence of synthetic fungicides, herbicides, and insecticides further minimizes negative impacts on beneficial microbial populations, preserving the biological integrity of the soil ecosystem (Tuck et al. 2014; Bünemann et al. 2018) [35,7] . Table 4 provides a quantified summary of soil quality improvements reported across long-term studies of organic management systems. Leifeld & Fuhrer (2010) [19] ; Gattinger et al., (2012) [11] Microbial biomass +25-50% vs. conventional

Continuous organic substrate addition

Nutrient cycling, disease suppression, enzyme activity Lori et al., (2017) [20] ; Banerjee et al., (2016) [2] Carbon sequestration +0.1-0.4 Mg C ha⁻¹ yr⁻¹

No-till, mulch, cover crops, biochar

Climate mitigation, long-term fertility, soil structure

West & Post (2002) [37] ; Poeplau & Don (2015) [25] Water-Holding Capacity (WHC) +10-25% Organic matter addition; mulching Drought resilience; reduced irrigation demand

Glab & Kulig (2008) [12] ; Basche & DeLonge (2019) [3] Aggregate Stability Significantly improved FYM, compost, reduced tillage Reduced erosion, better aeration, root growth Bhattacharyya et al., (2018) [5] ; Lal (2004) [16] Enzyme activity (e.g., phosphatase, urease) +30-60% vs. conventional Diverse organic inputs; no synthetic biocides Mineralization of P and N; improved plant nutrition Lori et al., (2017) [20] ; Bünemann et al., (2018) [7] Soil biodiversity (macro/meso)

Greater species richness

Absence of pesticides; diverse crop rotations Ecosystem resilience; pest and disease regulation

Tsiafouli et al., (2015) [34] ; Tuck et al., (2014) [35] SOM = soil organic matter; SOC = soil organic carbon; WHC = water-holding capacity; CEC = cation exchange capacity; BNF = biological nitrogen fixation; Mg C ha⁻¹ yr⁻¹ = megagrams carbon per hectare per year

Policy, regulation, and governance

The transition toward organic farming systems and the sustainable utilization of organic resources represents not only an agricultural challenge but also a fundamental governance and policy imperative. Widespread adoption requires supportive policies, economic incentives, and institutional assistance (Pretty et al. 2018; Lampkin et al. 2015) [27,18] .

Policy frameworks

The utilization of organic resources in agriculture is strongly shaped by regional and national regulations that must balance agricultural sustainability with environmental protection. Key frameworks include the European Union Nitrates Directive and the United States Clean Water Act, which establish standards for nutrient application rates and regulate runoff from organic fertilizers to prevent water pollution (European Commission 1991; U.S. EPA 2004) [8,36] . Certification standards such as EU Organic and USDA Organic regulate the sourcing, processing, and application of organic materials (IFOAM, 2020) [14] . Nutrient Management Plans (NMPs), mandatory in many jurisdictions, ensure that manure application aligns with crop nutrient requirements and minimizes nitrogen and phosphorus losses to the environment (OECD, 2021) [24] . Emerging carbon footprint policies are beginning to incentivize carbon sequestration and GHG reduction through the use of biochar, compost, and manure (FAO, 2021) [10] . Table 5 presents a comparative overview of major global policy frameworks relevant to organic resource management, including their key provisions and regulatory significance. [36] EU Farm to Fork Strategy (2020)

European Union

Target: 25% organic farmland by 2030; 50% reduction in synthetic pesticide use Accelerates organic transition; incentivizes organic amendments European Commission (2020) [9] USDA Organic Regulations (NOP) United States Prohibits synthetic fertilizers/pesticides; mandates organic matter management Encourages compost, manure, and crop residue use IFOAM (2020) [14] FAO agroecology framework Global Promotes nutrient recycling, biodiversity, and climate-smart practices Reduces synthetic input dependency globally FAO (2021) [10] OECD nutrient management plans OECD countries Mandatory NMPs for large farms; training for smallholders Aligns organic input rates with crop demand; reduces losses OECD (2021) [24] India national policy on biofertilizers India Subsidizes biofertilizer production; mandates quality standards Promotes microbial inoculants with organic amendments Banerjee et al., (2016) [2] NMP = Nutrient Management Plan; NVZ = Nitrate Vulnerable Zone; CAFO = Concentrated Animal Feeding Operation; F2F = Farm to Fork Strategy; NOP = National Organic Program; BNF = biological nitrogen fixation

Risk and adoption barriers

Although organic farming and organic resource utilization offer substantial environmental and agronomic advantages, several barriers continue to restrict widespread adoption. During the transition from conventional to organic farming, producers frequently experience lower crop yields due to the absence of synthetic fertilizers and pesticides; technical guidance, pilot programmes, and transitional grants are therefore critical to reducing financial risk (Migliorini and Wezel, 2017) [22] .

Inconsistent and fragmented policies related to organic farming and waste management create regulatory uncertainty that hinders long-term planning by farmers and agribusinesses (Lampkin et al. 2015) [18] . A persistent shortage of trained extension officers and technical expertise at the farm level further constrains adoption, underscoring the need for sustained investment in education, training, and knowledge-transfer systems (Pretty et al. 2018) [27] .

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