Search Results (700)

Plastic is a valuable material for packaging of food and pharmaceuticals, protective wrappings in construction and agriculture, and fluid storage. Flexible plastic or plastic film waste from packaging, agriculture, and construction applications grows at a rate of at least 92 million metric tons a year, is considered challenging to recycle, and is typically landfilled. In recent years, there have been great advancements in plastic recycling technology in order to deal with the global challenge of plastic waste buildup and support legislation from a local to national level to implement recycling. This work highlights the most recent advancements in plastic film recycling. Plastic films are mono- or multilayered based on what their applications will be, with multilayer multimaterial films being the more challenging feedstock for recycling. Mechanical recycling cannot easily process flexible films. Pyrolysis can use polyolefin-based film as feedstock but is not practiced at scale to match the rate of plastic film waste generation, and incineration can recover energy from film feedstock but is not recycling plastic. This has motivated the development of new recycling technologies designed around plastic films. Better characterization technologies to identify film compositions in municipal waste streams have been key to sorting out film feedstock for mechanical recycling and the baling of flexible plastic waste, but they struggle with multilayer films and black plastic. Compatibilization enables the recycling of mixed plastic waste but requires polymer compositions for selecting specific compatibilizers. Dissolution–precipitation recovers individual types of polymers from multilayer films and, at the same time, can purify polymers from additives or contaminants, but requires intense solvent processing and associated energy. Delamination of multilayer films can separate and recover solid films of polyolefins at relatively low amounts of solvent but requires quality feedstock to be efficient. Both dissolution–precipitation and delamination recycling of films recover the original polymer molecules and maintain their embodied energy, hence support circularity. In the case of PET-containing films, depolymerization to recover PET monomers offers opportunities to recycle challenging film feedstock. Full article

This work reviews the strategic valorization of industrial by-products as sustainable sources of biopolymers and bioactive compounds, promoting a circular economy through the efficient use of renewable resources and reducing waste generation. These strategies contribute to lowering the carbon footprint of conventional packaging and plasticulture while supporting more resilient and diverse agriculture systems. Special emphasis is placed on processing roots and tubers as renewable raw materials for the production of biodegradable films for agronomic applications as eco-friendly alternatives to petroleum-based plastics and contributing to soil and ecosystem protection. Additionally, the incorporation of by-products from yerba mate (Ilex paraguariensis) demonstrate significant potential as both matrix-forming and filler materials in biodegradable composites while also providing antioxidant activity and pH-sensing capacity. This sustainable framework is further expanded through the utilization of non-traditional species like rosehip (Rosa rubiginosa), Aloe vera (Aloe barbadensis), and topinambur (Helianthus tuberosus), which provide versatile functional matrices and bioactive compounds. Finally, the development of active and intelligent food packaging is addressed. Extracting natural pH-sensitive pigments from red cabbage and topinambur flowers enables the formulation of eco-friendly inks for real-time freshness monitoring. Ultimately, integrating these waste streams drives technological disruption, scaling sustainable, tailored solutions for global industry needs. Full article

Global population growth, climatic extremes and rising resource pressures necessitate innovative agricultural methods to boost food, feed, fibre and fuel production sustainably. Seed enhancement technologies (SETs), such as seed coating and priming, have emerged as effective strategies to improve seed viability and vigour, seedling establishment and overall crop yield. Conventional seed treatments include seed coating (film coating, encrusting, pelleting) and seed priming (hydro-, osmo-, halo- bio-, nutri-, hormonal-, chemical- and solid matrix priming). They offer advantages such as improved seed handling, uniform germination and promotion of early growth. However, they also have significant drawbacks, including on soil health and off-target pollution from synthetic polymers and pesticides, seed longevity issues from re-drying and outcomes that can vary among different crops, soils and environments. To tackle these issues, new non-traditional SETs are being investigated, including nanotechnology, novel biodegradable coatings and agrichemical-free biostimulants, such as plant growth promoting microorganisms. These innovative methods demonstrate great promise in enhancing active and crop performance while minimising environmental impacts by providing alternatives to materials derived from fossil fuels and that contribute to waste and pollution. This review critically examines both conventional and novel SETs, discusses their pros and cons and outlines strategic research and industry directions to enhance agricultural sustainability and productivity in light of global food and resource security challenges. Full article

Lignin is a promising bio-based filler for poly(butylene adipate-co-terephthalate) (PBAT), yet its true contribution to biodegradation remains unclear—most studies rely on weight loss alone, neglecting CO₂ mineralization and lignin’s antibacterial activity. Here, lignin/PBAT composites with 1 wt% (LP-1) and 3 wt% (LP-2) lignin are assessed under composting conditions using both weight loss and mineralization rate. Lignin exhibits a dual role: it promotes hydrolytic weight loss (18.3% and 28.6% for LP-1 and LP-2 at 40 days), but significantly inhibits ultimate mineralization (one-year mineralization: 65.71% for pure PBAT vs. 48.74% and 29.53% for LP-1 and LP-2). A negative initial mineralization rate suggests transient antibacterial activity from released phenolic compounds. Lignin increases crystallization temperature (48.4 → 92.6 °C) and T_g (−28.5 → 49.1 °C), with 1% loading largely preserving mechanical properties. These findings demonstrate that weight loss alone is insufficient to assess degradation; mineralization must be included. Appropriate lignin loading enables balanced performance and degradation controllability, offering new insights into lifecycle assessment of green composites. Full article

Currently, controlled-environment agriculture (CEA) and hydroponic production systems represent sustainable alternatives for improving leafy vegetable production by controlling the variables that influence their growth. This research studied the effect of variations in photoperiod and nutrient solution concentration on the development of a hydroponic crop. The response variables analyzed were growth, physiological response, and nutrient content of chard. The hydroponic cultivation technique used was the Nutrient Film Technique (NFT) under controlled environmental conditions. The experimental design was developed with two photo-period treatments: 12 h light/12 h darkness and 10 h light/14 h darkness, combined with three levels of nutrient concentration at 100%, 75% and 50% of the standard Steiner formulation. The data were analyzed using two complementary approaches: (1) ANOVA with Tukey’s post-hoc test to identify specific group differences, and (2) principal component analysis (PCA). It was observed that the concentration of the nutrient solution had a significant effect on the growth and nutritional quality variables of the crop. Treatments with a 100% nutrient solution resulted in higher values for plant height, biomass, protein, potassium, and calcium. Reducing the nutrient solution concentration resulted in a clear decrease in crop growth variables. The effect of photoperiod on crop development was found to be less significant. The PCA accounted for 96.8% of the total variability. This indicates that nutrient concentration was the primary factor associated with growth and nutritional content in chard. The results show that nutrient reduction directly affects crop productivity and nutritional quality. However, moderate variations in photoperiod had a secondary effect under the conditions evaluated. This research provides relevant information for developing nutritional management strategies and sustainable production in controlled-environment hydroponic systems. It also contributes new knowledge on integrating hydroponic crops in controlled environments into sustainable agri-food systems using Internet of Things (IoT) technologies for efficient crop management. Full article

This study investigated the development of biopolymer films from bitter cassava starch (Manihot esculenta) and coconut mesocarp cellulose as a promising alternative for biodegradable packaging. The biopolymer film was prepared using the casting method, with glycerol as a plasticiser and Tween 80 as an emulsifier. Different formulations were developed by varying the cellulose concentration to 6%, 8% and 10% to determine how this influences their physical and optical properties. FTIR analysis confirmed the presence of characteristic –OH, C–H, C=O, C–O–C and OH groups in the structure of the cellulose and starch, demonstrating their purity and chemical structure. It was found that the variation in cellulose within the starch polymer matrix significantly influences the microstructural organisation of the material, yielding film thicknesses of between 0.49 and 0.56 mm, with a moisture content ranging from 6.46% to 8.01% and a water absorption percentage between 67.7% and 109.5%; highlighting that the cellulose concentration of 0.4 g (8%) yielded the best results. This research contributes to bridging the existing gap in the utilisation of agricultural waste from bitter cassava and coconut mesocarp, integrating them to form biodegradable composites with potential use in biodegradable packaging, thereby strengthening environmental sustainability through the circular economy. Full article

Greenhouses in subtropical and tropical regions must be designed as agricultural engineering systems adapted to local climates, rather than simply replicating the “insulation” models of temperate areas. Under extreme climatic conditions such as persistent high temperatures, intense solar radiation, high humidity, heavy rainfall, and frequent extreme winds, greenhouses transform from enclosed insulation layers into selective climate filters, mitigating crop stress while maintaining close contact with the outdoor environment. This paper summarizes how these climate drivers are reshaping the use, structure, and control concepts of greenhouses, emphasizing that the performance of warm-zone greenhouses depends primarily on heat dissipation, humidity management, and biohazard control, rather than heating and insulation. In this review, we analyze the climatic boundary conditions that define warm-climate conservation cultivation, including long-term overheating risk, high UV radiation, vapor pressure deficit, and suppressed condensation tendency, as well as storm-induced uplift and dynamic loads. These constraints necessitate unique structural forms: tall, lightweight, well-ventilated building types with large roof and side openings, roof geometries that facilitate rainwater runoff, sophisticated drainage systems, and corrosion-resistant materials suitable for humid and coastal environments. Because insect netting significantly reduces ventilation, pest control and temperature regulation become co-design issues, requiring oversized vents, optimized airflow paths, and hybrid roof–mesh structures. Ventilation is considered the primary climate-control mechanism, supplemented by passive cooling measures such as shading and radiation/optical management (e.g., diffuse films and near-infrared-selective films). Active evaporative cooling is considered a conditional measure due to humidity limitations and disease risks. This paper also integrates the impacts on specific crops (fruits and vegetables, leafy greens, and orchids). It highlights emerging trends: typhoon-resistant and adaptive geometries, computational fluid dynamics (CFD)-based design, and sensor-rich IoT/digital twin control frameworks. These principles collectively establish a coherent design framework for achieving resilient, resource-efficient greenhouse production in warm climates. Full article

Halotolerant plant growth-promoting bacteria offer a sustainable strategy to improve crop performance under saline conditions. This study evaluated Agave tequilana Weber var. Azul leaf juice was used as an alternative growth medium for Kocuria sediminis AS04, and the bacterium’s ability to alleviate salt stress in chiltepin (Capsicum annuum) was evaluated. The chiltepin seedlings were grown in a specialized chamber and exposed to higher salt levels (200, 400, and 600 mM NaCl) for 10 days. During this time, the protective effect of K. sediminis AS04, which was held in a polymer film, was examined. K. sediminis AS04 grew well in a medium containing 25% agave juice and urea, reaching a density of 1.3 × 10¹⁰ CFU mL⁻¹. Compared with conventional Tryptic Soy Broth, the medium formulated from agave leaf juice and urea could reduce the cost per kilogram of biomass by approximately 4-fold. Under severe salinity stress, plants inoculated with immobilized K. sediminis at 600 mM NaCl exhibited the highest shoot biomass (0.31 g⁻¹ plant), root length (50.7 mm), and proline accumulation (11.25 µmol g⁻¹ fresh weight), whereas uninoculated plants displayed reduced biomass (0.16 g plant⁻¹) and shorter roots (34.5 mm). At 600 mM NaCl, inoculation increased shoot biomass, root length, and plant survival by approximately 94%, 47%, and 200%, respectively, compared with uninoculated seedlings. This method values agro-industrial waste and enhances chiltepin performance under high-salinity conditions. It promotes sustainable production and helps create affordable inoculants for agricultural biotechnology. Full article

The Loess Plateau is a typical dryland agricultural region where water scarcity constrains crop production. Plastic film mulching is widely used to mitigate this limitation, but its long-term application has caused soil degradation and environmental pollution, highlighting the need for sustainable alternatives. This study evaluated the effects of post-wheat sequential green manure cropping—common vetch (CV) and winter rape (CR)—on soil water balance, potato yield, water use efficiency (WUE), and economic returns within a winter wheat-potato rotation system. A field experiment (2019–2023) was conducted on the Loess Plateau, comparing CV, CR, plastic film mulching (PM), and no mulching (NM). Soil water content (0–200 cm), evapotranspiration (ET), tuber yield, WUE, and economic performance were measured. Although CV and CR depleted soil water in the 0–100 cm layer during their growth, subsequent fallow precipitation (86 mm) and low soil water loss replenished the deficit, resulting in comparable soil water storage at potato sowing among CV, CR, and NM (518.8, 508.8, and 518.9 mm, respectively). Over the full rotation cycle, a positive soil water balance (63.1–147.5 mm) was maintained across all treatments, indicating no detectable net depletion within the measured 0–200 cm profile over the four potato seasons. Potato tuber yield increased by 61.7% (CV), 52.4% (CR), and 74.8% (PM) relative to NM. The WUE of CV (73.5 kg ha⁻¹ mm⁻¹) and CR (71.5 kg ha⁻¹ mm⁻¹) was comparable to that of PM (74.2 kg ha⁻¹ mm⁻¹) and significantly higher than that of NM (46.1 kg ha⁻¹ mm⁻¹). Net incomes under CV and CR did not differ significantly from PM, while their input costs were lower. Collectively, the integrated system combining post-wheat sequential green manure cropping—particularly with common vetch—and straw mulching represents a technically feasible, economically viable, and environmentally beneficial alternative to plastic film mulching, contributing to sustainable dryland agriculture on the Loess Plateau and analogous semi-arid regions. Full article

Agricultural waste-based biodegradable films are promising alternatives to polyethylene mulch films, but their use is limited by insufficient mechanical stability and the difficulty of balancing strength, ductility, and stiffness. In this study, cow dung-based biodegradable films were modified with cationic starch and halloysite nanotubes (HNTs) through a brush-coating process. SEM observations of pristine HNTs, the uncoated substrate, the starch-coated control, and the representative starch/HNT composite film provided morphological evidence for starch coating formation and HNT incorporation into the surface layer. Fifteen initial formulations were evaluated using tensile strength, elongation at break, apparent tensile modulus, a normalized mechanical balance score, and weighting sensitivity analysis. The highest values of the three mechanical indicators occurred at different formulations, indicating that formulation selection should be treated as a mechanical balance problem rather than a single-property maximization task. F14 showed the most stable overall mechanical balance among the tested formulations. SVR and GBR models were then used as bounded auxiliary tools for local trend mapping, with LOOCV R² values of 0.679, 0.855, and 0.856 for tensile strength, elongation at break, and apparent tensile modulus, respectively. A desirability-based consensus analysis identified a high-potential window at approximately 2.30–2.50 wt% starch and 1.25–1.75 wt% HNT. Four previously untested formulations selected from this frozen model-defined region were independently prepared and experimentally validated, showing good prediction–experiment consistency within the candidate window. Preliminary soil burial observation further indicated progressive macroscopic structural deterioration of F14 during prolonged soil exposure, although this result was interpreted only as qualitative appearance evidence. Overall, the proposed workflow provides an experimentally bounded decision-support strategy for prioritizing mechanically balanced starch/HNT-modified cow dung-based biodegradable film formulations. Full article

Understanding the environmental fate of microplastics (MPs) in agricultural soils remains a major challenge, particularly under field conditions where soil structure and hydraulic processes jointly regulate particle transport and retention. This study investigated whether hydro-physical soil functioning can explain the distribution and accumulation of MPs in pistachio orchard soils from a semi-arid region of southeastern Türkiye. A total of 42 soil samples were analyzed for MP abundance, size distribution, and morphology, together with key hydro-physical properties including texture, porosity, bulk density, aggregate stability, organic matter content, and soil water retention characteristics. To identify the dominant controls on MP occurrence, explainable machine learning approaches combining Random Forest (RF), Gradient Boosting Decision Trees (GBDT), and SHAP (SHapley Additive exPlanations) analysis were employed. Microplastic abundance differed among management systems. Former landfill or construction sites represented the largest proportion of the total recorded microplastic abundance (40.9%), followed by conventionally managed (25.2%), manure-amended (24.5%), and sewage-sludge-amended orchards (9.4%). Median microplastic abundances were 1433, 667, 4633, and 633 particles kg⁻¹ soil, respectively. Fine-sized MPs constituted the dominant particle fraction and exhibited strong associations with pore-system characteristics, indicating that pore-size compatibility governs their retention and mobility within the soil matrix. Morphology-specific analyses further revealed contrasting relationships between soil hydro-physical properties and individual MP forms, suggesting distinct retention pathways for granules, films, fragments, and fibers. Explainable AI analysis identified organic matter, silt content, bulk density, and water retention characteristics as the most influential predictors of MP occurrence. Among the tested models, RF demonstrated superior predictive robustness and generalization capacity. The findings demonstrate that hydro-physical soil functioning plays a central role in determining microplastic fate in agricultural soils and highlight the value of interpretable machine learning frameworks for uncovering the mechanisms underlying contaminant retention and redistribution. Integrating soil structural indicators with explainable artificial intelligence offers a promising pathway for improving microplastic risk assessment in agroecosystems. Full article

Agricultural soil contact components, including ploughshares, rotary blades, and furrow openers, form the active interface between machinery and complex field media. Operating in multiphase environments, these tools face severe abrasive wear, impact fatigue, and interfacial adhesion. These destructive forces irreversibly alter edge geometry and drastically degrade macroscopic operation quality. This review integrates tillage and precision seeding components into a unified tribological framework. It highlights the nonlinear relationship between microscopic material removal and geometric edge retention. Profile degradation is heavily dictated by soil texture, where sandy soils cause micro-cutting, clay soils induce severe adhesion, and gravelly soils produce impact fracture. To predict these complex wear behaviours accurately, coupled multiphysics numerical simulation using the discrete element method for particle flow dynamics and finite element analysis for transient contact stress provides a highly robust methodology. Mitigating these failures requires a functionally zoned surface engineering approach. Carbide hardfacing offers localized abrasion resistance, while polymer composite layers and bionic nonsmooth structures effectively interrupt continuous liquid films in wet cohesive soils. Ultimately, integrating online multidimensional sensing with full life cycle digital-twin models represents the future trajectory for developing adaptive and highly durable agricultural equipment. Full article

The extensive use of petroleum-based plastics in food packaging has raised environmental concerns, increasing interest in biodegradable materials derived from renewable resources. Cellulose-based films from agricultural residues offer a sustainable alternative, and incorporating bioactive compounds can provide active packaging functionality to enhance food preservation. In this study, resveratrol was incorporated into oat straw-derived cellulose films to develop biodegradable active packaging materials. Films with varying concentrations of resveratrol were prepared and evaluated for physical, mechanical, barrier, optical, antioxidant, biodegradation, and fruit preservation properties. Resveratrol significantly enhanced the films’ antioxidant activity, increasing radical-scavenging activity from 4.05% in the control film to 19.70% in the film containing 0.7% resveratrol. The films also exhibited improved ultraviolet light-blocking properties while maintaining comparable moisture content, water solubility, mechanical properties, water vapor permeability, and biodegradation behavior. All films showed rapid soil biodegradation, with more than 80% weight loss after 33 days. During grape storage, the resveratrol-containing film maintained the fruit quality by moderating changes in weight loss, total soluble solids, titratable acidity, and ascorbic acid content, while avoiding the quality deterioration observed in polystyrene-covered grapes during storage. These findings demonstrate that oat straw-derived cellulose films containing resveratrol combine antioxidant activity, ultraviolet light protection, biodegradability, and improved preservation performance during grape storage. The developed films show promise as sustainable antioxidant active packaging materials for fresh-produce applications. Full article

Precise identification and monitoring of small agricultural water bodies are essential for sustainable water resources management in arid and semi-arid regions, where even limited water losses can significantly affect agricultural productivity and local water security. However, the accurate detection of small ponds remains a major challenge in remote sensing, to address this challenge, this study proposes an integrated three-step framework that combines high-resolution remote sensing imagery, machine and deep learning techniques, and hydrological analysis to identify agricultural ponds and quantify their evaporation losses in Bastam, Iran. In the first step, a dedicated annotated dataset comprising 1061 RGB satellite images, each with a spatial size of 256 × 256 pixels and a ground resolution of 0.5 m, was developed for model training and evaluation. Using this dataset, three deep learning models BiSeNet, UNet3+, and SegNet and four traditional supervised classifiers Maximum Likelihood, Neural Network, Mahalanobis Distance, and Minimum Distance were implemented and compared for pond detection. The results demonstrated that deep learning models consistently outperformed conventional classifiers in delineating small agricultural ponds. Among all evaluated methods, BiSeNet achieved the highest segmentation performance, with an IoU of 82.08%, an F1-score of 90.15%, a precision of 91.86%, and a recall of 88.50%. Among the conventional classifiers, Maximum Likelihood combined with a 5 × 5 spatial kernel produced the best performance, achieving an IoU of 76.90%, an F1-score of 86.93%, a precision of 90.87%, and a recall of 83.32%, whereas simpler classifiers such as Minimum Distance showed only marginal improvements after kernelization. In the final step, the detected ponds were used to estimate evaporation losses through the Meyer method. The hydrological analysis revealed a clear periodic pattern in evaporation and a cumulative water loss of 388,636.7 m³ over a nine-month period, highlighting the considerable impact of evaporation on the efficiency of small agricultural water storage systems in dry environments. Based on these findings, practical mitigation strategies, including evaporation-reducing chemical surface films and floating covers, are discussed as potential options for reducing water loss. Overall, the proposed framework demonstrates the clear advantage of deep learning for the accurate identification of small agricultural ponds and provides an integrated methodological basis for monitoring water bodies and evaluating associated evaporation losses. The study offers a practical and transferable approach for supporting agricultural water management and improving water-use efficiency in arid and semi-arid regions. Full article

Agricultural waste-derived biochars have recently attracted increasing attention as sustainable adsorbents for wastewater treatment. In this study, biochars (BHBs) produced from buckwheat husks at 500, 600, and 700 °C were investigated as novel adsorbents for the removal of the cationic dyes Crystal Violet (CV) and Rhodamine B (RhB) from aqueous solutions. The obtained materials were characterized using thermogravimetric analysis and surface functional group analysis to evaluate the influence of pyrolysis temperature on their physicochemical properties. The effects of initial adsorbent dose, solution pH, and ionic strength were assessed, while adsorption kinetics and equilibrium isotherms were analyzed to elucidate the adsorption mechanisms. It was found that the adsorption of both dyes depended on pH. CV adsorption was lowest in an acidic environment and increased with increasing pH from 3 to 9. RhB was most effectively adsorbed in an acidic environment. Its adsorption decreased as the pH increased from 3 to around 5, after which it stabilized. The adsorption of CV decreased with increasing ionic strength of the solution, whereas the adsorption efficiency of RhB remained unaffected. The adsorption kinetics of CV and RhB on BHBs were found to follow a pseudo-second-order mechanism controlled by film diffusion. The Langmuir, Freundlich, and Temkin models all provided good fits to the equilibrium experiments. The adsorption capacities of BHBs for CV and RhB decreased with increasing pyrolysis temperature and surface alkalinity of the biochars (BHB700 < BHB600 < BHB500). The adsorption capacities of biochars ranged from 41.00 mg/g (BHB700) to 56.10 mg/g (BHB500) for CV and from 9.74 mg/g (BHB700) to 13.24 mg/g (BHB500) for RhB. The study highlights the potential of buckwheat husk-derived biochars as sustainable adsorbents for the treatment of dye-contaminated wastewater and provides insight into the relationship between pyrolysis conditions and adsorption performance. Full article