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Liners are usually grown from seed, but may also be grown from cuttings or tissue culture. They are grown in plastic trays with many "cells," each of which contains a single liner plant. Liners will typically range in size from a 36 cell tray up to a 288 cell tray. The most common size used in commercial nurseries is between 50 and 72 cells.
Landfill liners and covers in North America and Europe will probably see modest growth (~ 5%), while in other parts of the world growth could be dramatic (10–15%). [ citation needed ] Perhaps the greatest increases will be seen in the containment of coal ash and heap leach mining for precious metal capture.
Many plastic closures are made by injection molding. [6] Many closures need to have the ability to adjust to slight manufacturing variation in the container and the closure structure. Some closures are made of flexible material such as cork, rubber, or plastic foam. Often an o-ring or a closure liner (gasket made of pulp or foam cap liner) is ...
Row cover is a lightweight synthetic, such as clear plastic (polyethylene) or spunbonded polyester called horticultural fleece. Plastic covers are elevated above plants on a supporting framework such as wire hoops to form a low tunnel. (Plastic placed directly on the ground is mulch.) Fleece covers can be placed directly on plants or on ...
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The design allows expansion of bags to remain on the shoot during high winds and let the shoot grow within it. The cover is transparent to enable workers to observe developmental stages. The cover material is vapour permeable to prevent unwanted condensation from destroying transparency and to discourage the growth of mildew, fungus and bacteria.
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