Ramial chipped wood

Ramial Chipped Wood (RCW) is a wood product used in cultivation for mulching, fertilizing, and soil enrichment.

The raw material consists of the twigs and branches of trees and woody shrubs, preferably deciduous, including small limbs up to 7 cm. (2³⁄₄ in.) in diameter. It is processed into small pieces by chipping, and the resulting product has a relatively high ratio of cambium to cellulose compared to other chipped wood products. Thus, it is higher in nutrients and is an effective promoter of the growth of soil fungi and of soil-building in general. The goal is to develop an airy and spongy soil that holds an ideal amount of water and resists evaporation and compaction, while containing a long-term source of fertility. It can effectively serve as a panacea for depleted and eroded soils.

The raw material is primarily a byproduct of the hardwood logging industry, where it was traditionally regarded as a waste material. Research into forest soils and ecosystems at Laval University (Quebec, Canada) led to the recognition of the value of this material and to research into its uses. Originally termed BRF (French: "bois raméal fragmenté" or "chipped branch-wood".)

Usable types of wood

The wood from heartwood and branches larger than 3 inches in diameter is not desirable due to its high C/N (carbon to nitrogen) ratio (approximately 600:1), which then requires additional nitrogen for decomposition. Only the sapwood and young branches from the various noble hardwoods (such as oak, chestnut, maple, beech, and acacia) are used because the heartwood in larger branches is high in tannin.

Because of their specific lignin, Conifers may be used only in combination with deciduous RCW, and in no greater ratio than 10 to 20%. Conifer resin has no aggradation character because it consists of derivatives of diterpenes (resin part) and monoterpenes (part turpentine). Note that only the genera Pinus, Picea, Larix and Pseudotsuga have resin canals. The cedars are characterized by their constituents of the heartwood toxic to microorganisms, tropolone derivatives (thujaplicines) phenolic nature, and are therefore to be avoided in the production of ramial chipped wood.

The acidification of soils by RCW has not been observed. In contrast, acidic soils tend to have thei pH raised by RCW applications.

While some species, such as Black Locust and Black Walnut, bear heartwood containing resins that make them resistant to rot; in practice their RCW decomposes well on a moist soil. Even Larch, which resists decomposition and is also a gymnosperm, promoted successful forest regeneration in Quebec and was found to be the best of the gymnosperms for use in RCW (even better than some hardwoods).

Composition of RCW

Because they are the most exposed part of the tree to the light, and the most actively growing, young branches (and young trees) used in RCW are from the richest parts of the trees. They contain 75% of the minerals, amino acids, proteins, phytohormones and biological catalysts (enzymes) found in the tree.

References

Lemieux, G. & Lapointe R. A. "Le bois raméal et les mécanismes de fertilité du sol"; Laval University, Quebec, Canada; 1986; 17pp; OCLC 24214663 - the seminal paper that introduced the term
Regenerating soils with ramial chipped wood

Wood products

Lumber/ timber	Batten Beam Bressummer Cruck Flitch beam Flooring Joist Lath Molding Panelling Plank Plate Post Purlin Rafter Railroad ties Reclaimed Shingle Siding Sill Stud Timber truss Treenail Truss Utility pole

Engineered wood	Glued laminated timber veneer LVL parallel strand I-joist Fiberboard hardboard Masonite MDF Oriented strand board Oriented structural straw board Particle board Plywood Structural insulated panel Wood-plastic composite lumber

Fuelwood	Charcoal biochar Firelog Firewood Pellet fuel Wood fuel

Fibers	Cardboard Corrugated fiberboard Paper Paperboard Pulp Pulpwood Rayon

Derivatives	Birch-tar Cellulose nano Hemicellulose Cellulosic ethanol Dyes Lignin Lye Methanol Pine tar Pitch Sandalwood oil Tannin Wood gas

By-products	Barkdust Black liquor Ramial chipped wood Sawdust Tall oil Wood flour Wood wool Woodchips

Historical	Axe ties Clapboard Dugout canoe Potash Sawdust brandy Split-rail fence Tanbark Timber framing Wooden masts

See also	Biomass Certified wood Destructive distillation Dry distillation Engineered bamboo Forestry List of woods Mulch Non-timber forest products Papermaking Wood drying Wood preservation Wood processing Woodworking

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