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Leaching



 
 
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Old 24-12-2012, 09:19 PM
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First recorded activity by GardenBanter: Dec 2012
Location: los angeles
Posts: 2
Default Leaching

Leaching is the removal of sap after harvest. In many areas of the world, the sap levels in harvested bamboo are reduced either through leaching or postharvest photosynthesis. Examples of this practice include:
Cut bamboo is raised clear of the ground and leant against the rest of the clump for one to two weeks until leaves turn yellow to allow full consumption of sugars by the plant.
A similar method is undertaken, but with the base of the culm standing in fresh water, either in a large drum or stream to leach out sap.
Cut culms are immersed in a running stream and weighted down for three to four weeks.
Water is pumped through the freshly cut culms, forcing out the sap (this method is often used in conjunction with the injection of some form of treatment).
In the process of water leaching, the bamboo is dried slowly and evenly in the shade to avoid cracking in the outer skin of the bamboo, thereby reducing opportunities for pest infestation.
Durability of bamboo in construction is directly related to how well it is handled from the moment of planting through harvesting, transportation, storage, design, construction and maintenance. Bamboo harvested at the correct time of year and then exposed to ground contact or rain, will break down just as quickly as incorrectly harvested material.
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