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Polytunnel (Agriculture Glossary)

Polytunnel : Also called a polyhousehoophousegrow tunnel, or high tunnel.

A type of greenhouse in the form of a typically semi-circular, elongated tunnel made from a steel frame covered in polyethylene; temperature, humidity, and ventilation can be adjusted by the opening and closing of vents. Polytunnels are used in similar ways to glass greenhouses and row covers, e.g. for season extension or as nurseries. Though primarily designed to provide temperature increases ranging from 5 to 25 °C (9 to 45 °F) above the outdoor ambient temperature, they can also protect plants against cold waves, as well as the drying effect of wind.

_ ស្វែងរកឬបកប្រែពាក្យផ្សេងទៀតនៅប្រអប់នេះ៖
_ខាងក្រោមនេះជាសៀវភៅនិងឯកសារសម្រាប់ការងារនិងរៀនគ្រប់ប្រភេទ៖
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