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Bast fibre
Bast fibre
Bast fibre
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Bast fibre (also called phloem fibre or skin fibre) is plant fibre collected from the phloem (the "inner bark", sometimes called "skin") or bast surrounding the stem of certain dicotyledonous plants. Some of the economically important bast fibres are obtained from herbs cultivated in agriculture, for instance flax, hemp, or ramie, but bast fibres from wild plants, such as stinging nettle, and trees such as lime or linden, willow, oak, wisteria, and mulberry have also been used.[1] Bast fibres are soft and flexible, as opposed to leaf fibres from monocotyledonous plants, which are hard and stiff.[2]

Since the valuable fibres are located in the phloem, they must often be separated from the woody core, the xylem, and sometimes also from the epidermis. The process for this is retting, and can be performed by micro-organisms either on land (nowadays the most important) or in water, or by chemicals (for instance high pH and chelating agents), or by pectinolytic enzymes. In the phloem, bast fibres occur in bundles that are glued together by pectin and calcium ions. More intense retting separates the fibre bundles into elementary fibres, which can be several centimetres long. Often bast fibres have higher tensile strength than other kinds, and are used in high-quality textiles (sometimes in blends with cotton or synthetic fibres), ropes, yarn, paper, composite materials and burlap. An important property of bast fibres is that they contain a special structure, the fibre node, that represents a weak point, and gives flexibility. Seed hairs, such as cotton, do not have nodes.[citation needed]

Etymology

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The term "bast" derives from Old English bæst ("inner bark of trees from which ropes were made"), from Proto-Germanic *bastaz ("bast, rope"). It may have the same root as Latin fascis ("bundle") and Middle Irish basc ("necklace").[3][4]

Use of bast fibre

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Plants that have been used for bast fibre include flax (from which linen is made), hemp, jute, kenaf, kudzu, linden, milkweed, nettle, okra, paper mulberry, ramie, and roselle hemp.[citation needed]

Bast fiber from oak trees forms the oldest preserved woven fabrics in the world. It was unearthed at the archeological site at Çatalhöyük in Turkey and dates to 8000-9000 years ago.[5]

Dress of unspecified bast fibre, Yuracaré, Rio Chimoré, Bolivia 1908–1909.
Cycling suit of linen bast fiber, New York, New York, United States, 1908

Bast fibres are processed for use in carpet, yarn, rope, geotextile (netting or matting), traditional carpets, hessian or burlap, paper, sacks, etc. Bast fibres are also used in the non-woven, moulding, and composite technology industries for the manufacturing of non-woven mats and carpets, composite boards as furniture materials, automobile door panels and headliners, etc. From prehistoric times through at least the early 20th century, bast shoes were woven from bast strips in the forest areas of Eastern Europe.[citation needed]

Where no other source of tanbark was available, bast has also been used for tanning leather.[6]

References

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Bast fibre

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from Grokipedia
Bast fibres are natural plant fibres extracted from the , or inner bark (bast), of the stems of dicotyledonous , primarily composed of with varying amounts of , , , and waxes. Common sources include (Linum usitatissimum), (Cannabis sativa), (Corchorus spp.), (Boehmeria nivea), (Hibiscus cannabinus), and nettle (), among others. These fibres exhibit high tensile strength (typically 300–910 MPa), flexibility, low (1.4–1.5 g/cm³), and biodegradability, making them renewable alternatives to synthetic materials. Historically, bast fibres have been utilized for over 8,000 years, with evidence of cultivation dating to around 5000 BCE in the , initially for textiles, ropes, sails, and fishing nets. Their use expanded in the for cordage and canvas, but declined in the with the rise of synthetic fibres; a resurgence occurred in the late 20th and 21st centuries due to demand for sustainable materials. Today, bast fibres serve diverse applications, including high-quality textiles like from , geotextiles, and reinforcement in biocomposites for automotive parts (e.g., door panels), , , and packaging, leveraging their acoustic and properties. Processing methods such as (water, , or chemical) are essential to separate fibres from the stem, influencing final quality and yield.

Definition and Characteristics

Definition

Bast fibres are sclerenchymatous fibres derived from the , also known as the bast or inner bark, of dicotyledonous plants. These non-living, durable fibres form part of the secondary tissue and provide structural support to the . They are distinguished from other categories of natural plant fibres, such as seed fibres like , leaf fibres like , and fruit fibres like , which originate from different botanical parts. Unlike wood fibres from the or surface fibres from the , bast fibres are specifically sourced from the layer surrounding the vascular core. The core attributes of bast fibres include their elongated, flexible structure and lignocellulosic composition, dominated by (typically 60-80%), along with and . This high cellulose content imparts significant tensile strength and flexibility, rendering them well-suited for spinning into yarns and fabrics. Common examples of bast fibres include those from and plants. The term "bast" derives from Old English bæst, denoting the inner, fibrous bark of trees, a usage rooted in .

Physical and Chemical Properties

Bast fibres exhibit a range of physical properties that contribute to their utility in and composite applications. These fibres typically have lengths ranging from 1 to 150 cm, depending on the source and extraction method, with diameters between 10 and 60 micrometers, resulting in a fine, elongated structure suitable for spinning. Their tensile strength generally falls within 30 to 80 cN/, providing good load-bearing capacity, while elongation at break varies from 1 to 10%, allowing moderate flexibility without excessive . Additionally, bast fibres demonstrate absorption rates of 8 to 12%, reflecting their hydrophilic nature due to polar groups in their composition. Chemically, bast fibres are primarily composed of , which constitutes 60 to 80% of their dry weight, forming the crystalline backbone that imparts strength. Hemicellulose accounts for 10 to 20%, contributing to the matrix that binds cellulose microfibrils, while ranges from 2 to 25%, providing rigidity but varying significantly by fibre type and maturity. These components, along with minor amounts of and waxes, determine the fibres' overall reactivity and processability. At the microscopic level, bast fibres consist of tubular sclerenchyma cells with thick, lignified walls featuring spiral thickenings and occasional nodes, enclosing a central lumen that can collapse during processing. This structure supports axial load transfer and gives the fibres their characteristic from nanoscale microfibrils to macroscale bundles. In terms of comparative metrics, bast fibres have a of 1.4 to 1.5 g/cm³, making them lightweight relative to synthetic alternatives like glass fibres. Thermally, they remain stable up to decomposition temperatures above 200°C, with low thermal conductivity that enhances insulation properties.

Botanical Sources

Primary Plant Species

Bast fibres are primarily derived from the tissues of stems in various dicotyledonous plants, belonging mainly to the families Linaceae, , , and , with growth habits ranging from to depending on the . These plants provide long, strong fibres suitable for and industrial applications, with yields varying based on cultivation conditions and extraction efficiency. The most prominent species is flax (Linum usitatissimum), an annual herb in the Linaceae family, native to the Mediterranean region but widely cultivated in temperate climates. Flax stems yield bast fibres constituting 10-15% of the dry stem weight, with typical fibre production ranging from 1.5 to 2 tonnes per under optimal conditions. It is predominantly grown in temperate , including countries like , , and , where it benefits from cool, moist summers. Hemp (Cannabis sativa), another annual plant from the Cannabaceae family, originates from Central Asia and produces bast fibres that account for about 25-35% of the stem's dry weight, yielding 2-4 tonnes of fibre per hectare in high-density plantings. Its cultivation is prevalent in Europe (e.g., France and the Netherlands) and North America, favored for its adaptability to diverse temperate soils. Jute, sourced from species such as and C. capsularis in the family, are fast-growing annuals suited to tropical and subtropical environments, with bast fibres comprising 4-8% of stem weight and overall yields of 1.8-2.5 tonnes per . This fibre is largely produced in , particularly and , which account for over 95% of global output due to the region's monsoon climate. Ramie (Boehmeria nivea), a in the family native to , can be harvested multiple times per year, yielding 1-1.6 tonnes of dry undegummed bast fibre per hectare annually, or up to 1.2 tonnes after degumming. It thrives in humid subtropical regions, with major production centered in , which dominates global supply. Kenaf (Hibiscus cannabinus), an annual from the Malvaceae family originating in , produces bast fibres representing 20-25% of stem dry matter, with yields of 2-3 tonnes per hectare from stalk productions of 10-15 tonnes. It is commonly cultivated in tropical and subtropical , including and , as well as parts of and the for its rapid growth in warm climates.

Cultivation and Harvesting

Bast fibres are derived from the phloem tissues of dicotyledonous plants such as flax (Linum usitatissimum), hemp (Cannabis sativa), and jute (Corchorus spp.), which require specific agronomic conditions to optimize stem elongation and fibre quality. These plants thrive in well-drained loamy soils with good aeration and organic matter content exceeding 2%, as heavy clay or waterlogged conditions can hinder root development and increase disease risk. Optimal pH ranges from 6.0 to 7.5 across species, though flax tolerates slightly acidic soils down to pH 5.5. Climatic preferences vary by species but generally fall within temperate to subtropical zones, with average temperatures of 15–25°C supporting vigorous growth and fibre bundle formation. Annual rainfall of 500–2000 mm is ideal, distributed evenly to avoid stress during vegetative phases, though supplemental may be needed in drier regions; for instance, requires at least 500–700 mm, while demands higher humidity and over 1200 mm in tropical settings. Excessive heat above 30°C or frost below -3°C can reduce fibre length and strength, particularly in . Crop rotation is essential to maintain and suppress pests, with bast fibre plants often alternated with cereals or every 3–4 years to enhance levels and prevent soil-borne diseases like nematodes. Planting occurs in spring after temperatures reach 7–10°C, using rates tailored to achieve target densities; for , rates of 80–120 kg/ha yield 500–800 plants/m², promoting uniform stands and finer fibres, while uses 40–60 kg/ha for 120–150 plants/m² in fiber-focused cultivation. Growth cycles last 90–150 days, encompassing , vegetative growth, and flowering, with sown densely at 5–6 kg/ha in rows 20–30 cm apart to reach maturity in 100–120 days. Harvesting timing is critical for fibre quality, typically at early flowering to capture elongated bast cells before lignification stiffens the stems; flax is pulled when 10–15% of plants are in bloom, using root-pulling methods to retain full stem length, whereas cutting with bars suits taller at 70–90 days post-sowing. stems are cut near the base at the onset of flowering, around 100–110 days, to ensure tender, high-quality fibres. Preserving stem integrity during minimizes mechanical damage and facilitates subsequent field operations. Post-harvest handling focuses on controlled to arrest microbial degradation and preserve fibre integrity, with stems bundled and spread in the field until moisture content drops to 12–15%. For , this involves dew-retting under natural conditions for 1–4 weeks before baling at under 15% moisture, followed by storage in aerated conditions to reach 10% equilibrium. Similar practices apply to and , avoiding direct sunlight to prevent yellowing and ensuring stacks are elevated off the ground.

Production Processes

Fiber Extraction Methods

Bast fibers are extracted from the of plant stems through a combination of biological to loosen the fibers and mechanical processes to separate them from the woody core. involves the degradation of and other binding substances by microorganisms or chemicals, facilitating the release of bundles without damaging their structure. The primary methods include dew and water . Dew occurs in the field, where harvested stems are spread out and exposed to dew, rain, and microbes that break down pectins over 3–6 weeks, depending on weather conditions such as and . This method is cost-effective and environmentally benign but can produce inconsistent quality due to variable microbial activity and potential over-retting in wet climates. Water retting submerges stems in tanks or ponds under anaerobic conditions, allowing to ferment and dissolve pectins more rapidly than dew retting. The process typically lasts 7–14 days in cold or 3–4 days in warm (28–40°C), yielding finer, brighter fibers suitable for high-quality textiles. However, it requires significant and can generate polluting if not managed properly. Chemical and enzymatic retting represent faster, more controlled alternatives to traditional methods. Chemical retting uses solutions like or acids to hydrolyze pectins, often completing in minutes to hours under heat, though it raises environmental concerns from chemical effluents. Enzymatic retting employs enzymes to selectively degrade non-fibrous components, typically over 4–24 hours, producing uniform, high-quality fibers with reduced water use and pollution compared to water retting. This modern approach enhances by minimizing ecological impact while improving fiber yield and properties. Following retting, mechanical separation refines the fibers through breaking, , and hackling. Breaking crushes the retted stems between rollers to fracture the woody core () while preserving the flexible bast layer. then beats the broken stems with blades to remove remaining and impurities, producing clean ribbons. Hackling combs the ribbons with pins to align and parallelize the fibers, eliminating short fibers and further for a smoother product. These steps collectively achieve a recovery yield of 20–30% from the retted stem weight, with long fibers comprising about 15% of the total in optimized processes.

Processing and Preparation

Following fiber extraction, such as , bast fibers undergo degumming to remove residual non-cellulosic components like , , and , which can affect fiber quality and processability. This process typically involves boiling the fibers in alkaline solutions, such as or , at temperatures around 80–100°C for 1–2 hours, which hydrolyzes and solubilizes these impurities, resulting in whiter, softer fibers suitable for further refinement. Cleaning may also incorporate enzymatic treatments or mild bleaching to enhance purity without excessive fiber damage, ensuring the cellulose content exceeds 90%. Grading assesses the processed fibers for uniformity and suitability for end-use, evaluating parameters such as length (typically 20–100 cm for bast types like flax or hemp), tensile strength (measured in cN/tex), and purity (absence of woody fragments or contaminants). Standards like ISO 1130 guide sampling and testing for fineness and strength in raw bast fibers, while ISO 2370 specifies methods for measuring linear density and diameter in flax, classifying fibers into grades based on micronaire values or bundle fineness. High-grade fibers exhibit lengths over 50 cm and breaking strengths above 30 cN/tex, enabling premium textile applications. To prepare fibers for yarn production, blending combines different grades or types (e.g., mixing with for balanced properties), followed by to disentangle and align the parallel-oriented fibers into slivers. Machinery such as gill boxes, equipped with pinned rollers, drafts and straightens the slivers by removing short fibers and hooks, achieving even orientation with minimal breakage at speeds up to 50 m/min. This step ensures cohesive drafting for subsequent spinning. Key quality metrics post-processing include , expressed in tex (mass per unit length, often 1–5 tex for fine bast fibers), and impurity levels below 2% to meet industrial thresholds for cleanliness and performance. These benchmarks, verified through standardized tests, confirm fiber readiness for high-value uses while minimizing defects like neps or unevenness.

Historical Development

Ancient and Traditional Uses

Bast fibres, derived from the of plants like and , represent some of the earliest materials harnessed by humans for practical purposes. Archaeological evidence from reveals cordage made from hemp fibres dating back to approximately 8000 BCE, with imprints of ropes found on shards indicating their use in binding and early utilitarian tasks. Similarly, in , produced from flax bast fibres appears in the as early as 5000 BCE, where it was employed for wrappings in tombs, aiding in the preservation of bodies during initial mummification practices. These prehistoric applications highlight the fibres' inherent strength and flexibility, which stemmed from their cellular structure, enabling them to withstand tension and environmental exposure. Throughout ancient civilizations, bast fibres were integral to traditional crafts, particularly for producing ropes, nets, and clothing in regions such as , , and . In , flax-derived served as a primary material for garments and textiles from the fourth millennium BCE, often combined with for everyday wear and ceremonial purposes. In ancient , flax cultivation and production trace back to the around 1200 BCE, where the fibre was woven into clothing and household items, as evidenced by textual records and archaeological remnants. Across , sites from 6000 BCE onward yield flax-based textiles and cordage, used for nets in fishing and hunting. Biblical texts further underscore flax 's role in the ancient , referencing its harvest and processing for fine garments symbolizing purity, as in Exodus 9:31 and Proverbs 31:13. Bast fibres held profound cultural significance in various societies, extending beyond basic utility to enable key advancements and rituals. In during the (c. 800–1050 CE), hemp fibres were crafted into sails and ropes for long-distance ships, with , , and fragments from sites like the Oseberg confirming their widespread use in maritime contexts. In ancient , mulberry bast fibres were pivotal in the invention of around 105 CE by court official , who combined them with and rags to create a durable writing medium that transformed and administration. Regional variations in bast fibre applications reflect local adaptations to environmental and economic needs. In medieval , particularly in (modern-day and ), jute fibres were processed into coarse sacks from at least the early medieval period, serving as essential storage for grains, , and other dry goods due to their breathability and robustness. These uses persisted through pre-industrial eras, underscoring bast fibres' versatility in supporting daily life and cultural practices across diverse geographies.

Modern Industrialization

The industrialization of bast fibre production began in the with significant mechanization efforts in , particularly for and processing. Mechanized and separation techniques emerged to replace labor-intensive manual methods, enabling larger-scale production; for instance, breaking and machines were introduced following retting to extract fibres from woody stalks. A pivotal milestone was the establishment of jute mills in , , during the , where spinners adapted existing machinery with power-driven spindles and treatments to process fibre, transforming the city into a global hub and boosting imports from 1,136 tons in the late to 300,000 tons by 1900. In the 20th century, bast fibre industries faced challenges from the rise of synthetic fibres following , which, along with , displaced traditional bast products in markets for textiles and cordage due to lower costs and greater uniformity. This led to a decline in commercial production, such as where growing ended by the 1960s amid post-war subsidies loss and synthetic competition. However, a revival occurred in the through interest in biocomposites, where bast fibres like and were recognized for reinforcing matrices, driven by surveys of their technical potential for sustainable applications. Meanwhile, machines for were developed in the to meet wartime cordage demands, facilitating mechanical separation of bast fibres from stalks. Technological advances further propelled industrialization, including automated harvesting systems like flax combiners introduced in the , which improved pulling efficiency over manual predecessors and handled major crops in regions such as . Genetic breeding programs also emerged to enhance yields, focusing on traits like stem and fibre content in crops such as and through and genomic analysis. By the , global production hubs solidified, with and accounting for approximately 80-88% of world output—India at around 52-58% and Bangladesh at 30%—sustaining the fibre's role despite broader synthetic pressures.

Applications and Uses

Textile Production

Bast fibres are transformed into yarns suitable for textile production through specialized spinning techniques that account for their inherent strength and rigidity. For , wet spinning is commonly employed, involving the of into a coagulating bath, which results in high-twist yarns with a lustrous, soft finish ideal for fine fabrics. In contrast, fibres are typically processed via dry spinning, where fibres are drafted and twisted without liquid, producing coarser yarns with shorter drafting times to preserve integrity. Yarn counts for bast fibres in applications generally range from 10 to 100 , enabling a spectrum from delicate apparel yarns to robust utility threads, with counts such as 83–111 tex achieved in processing through adjusted drafting and twist parameters. These yarns are then woven or into fabrics, leveraging the fibres' high tensile strength for durable end products. Flax-derived is often woven into plain or structures for shirting, providing crisp, breathable garments that maintain shape under wear. Hemp yarns, valued for their robustness, are used in heavier weaves like , suitable for sails, bags, and due to the fiber's resistance to abrasion. To enhance comfort and mitigate the of pure bast yarns, blends with are frequently incorporated, such as 30% hemp-cotton mixes produced via vortex spinning, which improve softness and moisture management without compromising durability. techniques are also applied, particularly for and hemp, to create stretchable items like sweaters, though remains dominant for structured textiles. Post-construction finishing processes refine bast fibre fabrics for aesthetic and functional performance. Scouring removes residual pectins and impurities using alkaline solutions, preparing the fabric for subsequent treatments, while bleaching with achieves whiteness and even dye uptake, essential for cellulosic bast fibres like and . follows, often with direct or reactive dyes, and treatments such as cationic agents on enhance to washing and light, preventing fading in end-use conditions. In the market, bast fibre textiles span luxury and practical segments. Irish linen, prized for its elegance and cool hand, dominates high-end fashion with shirting and suiting fabrics from premium yarns. Conversely, jute burlap serves utilitarian purposes in packaging and coarse sacks, valued for its low cost and strength in non-apparel applications.

Industrial and Composite Materials

Bast fibres serve as reinforcements in polymer composites, particularly in bioplastics, where they enhance mechanical properties while promoting . For instance, fibres integrated with matrices in unidirectional composites achieve tensile moduli ranging from 20 GPa at aligned orientations and high fibre volume fractions (around 0.40), making them suitable for structural applications. These composites leverage the high of bast fibres to improve load transfer and resistance in fibre-reinforced polymers (FRPs). In technical applications, bast fibres find use beyond textiles in geotextiles, paper production, insulation, and automotive components. Jute-based geotextiles effectively control on slopes, embankments, and drainage areas by stabilizing soil and promoting growth through water absorption and slow release. fibres have been employed in automotive interiors, such as door panels and backs, since the late , contributing to lightweight, eco-friendly designs in vehicles from manufacturers like Mercedes and . Additionally, fibres from and are processed into high-quality paper and /acoustic insulation materials due to their content and low conductivity. To optimize bast fibres for industrial FRPs, surface modifications like alkali treatment with are commonly applied, removing non-cellulosic components such as and to enhance matrix and interfacial bonding. This treatment increases fibre surface roughness and exposure, improving composite without compromising the natural fibre's integrity. Bast fibres offer key advantages as lightweight alternatives to synthetic reinforcements like glass fibres, with densities typically below 1.5 g/cm³—such as 1.4 g/cm³ for and 1.5 g/cm³ for —enabling reduced material weight in composites. Their biodegradability further positions them as eco-friendly substitutes, decomposing naturally and minimizing environmental persistence compared to non-degradable glass fibres (density ~2.5 g/cm³).

Economic and Environmental Aspects

Global Production and Trade

Bast fibres, encompassing , , , and , have a global production volume of approximately 4 million tonnes annually in the , with comprising the largest share at around 3.5 million tonnes in 2023. This output is dominated by , where and account for over 95% of supply, though recent data indicate as the leading producer with about 1.35 million tonnes in 2023, followed by at 1.25 million tonnes. production totals 0.4 million tonnes, primarily from and , while reaches 0.2 million tonnes, with key contributions from and . International trade in bast fibres centers on raw and processed exports from South Asia to major consuming markets in Europe and the United States, valued at over $220 million for jute and related textile bast fibres in 2023. Bangladesh leads as the top exporter with $162 million in shipments, primarily to India, Pakistan, and China, while India focuses on value-added products like woven fabrics, sending $3.4 million worth to the U.S. alone. Trade dynamics are shaped by tariffs and quality standards such as EU organic certifications, which require verified sustainable practices to access premium markets. The bast fibres market holds a value of about $3.2 billion as of 2023, reflecting steady demand in textiles and emerging sectors. Growth is particularly notable in biocomposites, where bast fibres like and reinforce eco-friendly materials for automotive and construction uses, projecting a (CAGR) of 5-7% through the decade. Bast fibre supply chains link smallholder farms in tropical and temperate regions to decentralized mills for extraction and spinning, but face disruptions from weather events like droughts and floods that reduce yields by up to 20% in vulnerable areas such as . Policy interventions further influence flows; for instance, the European Union's legalization of industrial hemp in the early 1990s, setting THC limits below 0.3% and integrating support via the , has expanded EU cultivation by over 46% since 2015 to meet domestic demand.

Sustainability and Challenges

Bast fibres provide notable environmental benefits during cultivation, particularly in resource efficiency and carbon management. Compared to , which requires approximately 10,000 liters of water per kilogram of fibre, bast fibres like and demand far less, often around 500–1,000 liters per kilogram, making them suitable for water-scarce regions. cultivation, in particular, contributes to , absorbing 3–10 tons of CO2 per annually due to its rapid growth and high yield. Additionally, the full plant utilization enhances , as bast fibres are extracted from the stem's outer layer, while inner hurds serve as bedding or building materials, and seeds provide oil and food, minimizing waste across the . Despite these advantages, bast fibre production faces significant challenges related to processing and market dynamics. Traditional water retting, a key step in fibre separation, generates highly polluting wastewater with biochemical oxygen demand (BOD) levels exceeding 1,400 mg/L in raw effluents from flax, posing risks to aquatic ecosystems if untreated. In large-scale monocultures, pest pressures can necessitate pesticide applications, though bast crops generally require fewer inputs than cotton; however, this still contributes to potential soil degradation and biodiversity loss over time. Furthermore, competition from inexpensive synthetic fibres, which dominate over 60% of the global textile market, hinders adoption due to their lower production costs and established supply chains, despite the environmental drawbacks of non-biodegradable plastics. Innovations are addressing these issues to improve sustainability. Organic farming practices for bast fibres, such as those applied to and , eliminate synthetic pesticides and fertilizers, reducing chemical runoff while maintaining yields through and natural . Closed-loop retting systems recycle water and chemicals, minimizing effluent discharge and pollution, as demonstrated in pilot processes for and that achieve near-zero waste. Life-cycle assessments further highlight their low impact, with cradle-to-grave emissions for bast fibres like and ranging from 1.3–1.4 kg CO2 equivalent per kg of fibre, substantially less than synthetics at 5–10 kg CO2/kg. Looking ahead, policies like the EU Green Deal are poised to boost demand for bast fibres by incentivizing low-carbon textiles and , potentially increasing European production of and by supporting credits. However, poses risks, with altered rainfall patterns projected to reduce yields of crops like by up to 20% in rain-dependent regions, necessitating resilient varieties and adaptive farming strategies.

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