Knowledge Tree
Hemp fiber
Also known as: Cannabis sativa L., industrial fiber hemp
Facts (24)
Sources
A critical review of industrial fiber hemp anatomy, agronomic ... bioresources.cnr.ncsu.edu 20 facts
measurementRecommended row spacing for hemp ranges from 7 to 17 cm, though fiber hemp is sometimes planted with 20 to 40 cm row spacing, according to Cherney and Small (2016), Liu et al. (2017), and Zheljazkov et al. (2023).
claimDayo et al. (2017) studied the curing behavior, mechanical properties, and thermal properties of natural hemp fiber reinforced polybenzoxazine composites.
measurementThe optimum soil temperature for industrial fiber hemp seed sprouting and vegetative growth is 13 to 25 °C, typically occurring in late spring.
measurementIndustrial fiber hemp typically requires nitrogen-rich fertilizer at a rate of 150 to 200 kg/ha during the vegetative growth stage and potassium fertilizer at 175 kg/ha.
measurementHemp stalk production costs $0.29 per kg for fiber hemp varieties and $0.41 per kg for dual-purpose varieties.
referenceShahzad, A. (2012) published 'Hemp fiber and its composites – A review' in the Journal of Composite Materials, providing an overview of hemp fiber applications in composites.
referenceStruik et al. (2000) reviewed the agronomy of fiber hemp (Cannabis sativa L.) in Europe.
claimThe xylem of industrial fiber hemp is composed of vessel members, ray cells, paratracheal cells, and libriform fibers.
claimFiber and grain hemp are cultivated from seeds.
claimChemical treatments influence the mechanical, thermal, and water absorption properties of hemp fiber/polybenzoxazine-based green composites, as detailed in a 2018 study published in Materials Chemistry and Physics.
measurementFiber, grain, and dual-purpose industrial hemp require approximately 336 kg/ha of potassium.
referenceJ. McVane, C. Trostle, and M. Bagavathiannan authored a report on agronomic considerations for growing fiber hemp in Central Texas for Texas A&M AgriLife Research in 2024.
referencePanaitescu et al. (2020) studied the effect of hemp fiber length on the mechanical and thermal properties of polypropylene/SEBS/hemp fiber composites, published in the Journal of Materials Research and Technology.
measurementFiber yield is 1480 kg/ha for fiber hemp varieties and 1275 kg/ha for dual-purpose varieties.
referenceM. Zimniewska reviewed hemp fiber properties and processing targets for the textile industry in a 2022 study published in Materials.
referenceIványi and Izsáki (2009) studied the effect of nitrogen, phosphorus, and potassium fertilization on the nutritional status of fiber hemp.
referenceIvonyi, Izsoki, and Van der Werf (1997) analyzed how nitrogen supply and soil phosphorus and potassium levels influence dry matter and nutrient accumulation in fiber hemp (Cannabis sativa L.).
measurementThe use of hemp fiber in wall construction reduces heat transfer and decreases the U-value to 0.18 W/m2K.
claimThe Environmental Protection Agency (EPA) has approved only one herbicide, ethalfluralin (registered under the trade name Sonalan® HFP), for use on fiber hemp.
referenceLamberti and Sarkar (2017) examined the use of hemp fiber for furnishing applications.
Weighing the risk of cannabis cross-pollination - Hemp Production canr.msu.edu Jul 12, 2019 4 facts
perspectiveThe cannabis industry should avoid forming factions that favor either marijuana/CBD hemp or grain and fiber hemp, as such divisions limit potential growth.
claimStrategic windbreaks, such as borders of thick crops or trees planted downwind, may help intercept cannabis pollen and physically isolate grain or fiber hemp crops.
claimFiber hemp production does not require pollination, but fiber fields typically include male plants because the cost of planting feminized seed or female clones is prohibitively high.
claimGrowing grain or fiber hemp indoors is impractical due to the large scale required to achieve profitability for these lower-value commodities.