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Plasticulture
The term plasticulture refers to the practice of using plastic materials in agricultural applications.
The plastic materials themselves are often and broadly referred to as "ag plastics." Plasticulture ag plastics include soil fumigation film, irrigation drip tape/tubing, nursery pots and silage bags, but the term is most often used to describe all kinds of plastic plant/soil coverings. Such coverings range from plastic mulch film, row coverings, high and low tunnels (polytunnels), to plastic greenhouses.
Polyethylene (PE) is the plastic film used by the majority of growers because of its affordability, flexibility and easy manufacturing.〔Allingham Yael (1992). (Sheets for use in Agriculture ). ''United States Patent''.〕 It comes in a variety of thicknesses, such as a low density form (LDPE) as well as a linear low density form (LLDPE). These can be modified by addition of certain elements to the plastic that give it properties beneficial to plant growth such as reduced water loss, UV stabilization to cool soil and prevent insects, elimination of Photosynthetically active radiation to prevent weed growth, IR opacity, antidrip/antifog, and fluorescent films.〔〔
==Greenhouses and walk-in tunnel covers==
A Greenhouse is a large structure in which it is possible to stand and work with automated ventilation. High tunnels are hoop houses, manually ventilated by rolling up the sides. Greenhouse and high tunnel films are usually within the parameters of 80-220μm thick and 20m wide, and have a life span between 6–45 months dependant on several factors.〔 Monolayer polyethylene films are better suited for less extreme environmental conditions, while multilayer covers made of three layers, one EVA19 layer inserted between two low density polyethylene layers has been shown to have a better performance under harsh conditions.〔Adam A, Kouider S.A., Hamou A, Saiter J.A. (2005). (Studies of polyethylene multi layer films used as greenhouse covers under Saharan climatic conditions ) ''Polymer Testing'', 24(7):e834–838.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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