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Greenhouse efficiency determination Hello Sir, I intend doing my Ph.D in the area of greenhouse engineering. That cultivating white yam during the dry season in Nigeria. In order to achieve this objective, i will need to construct a greenhouse of about 10 x 5 m. I am looking for a...

Greenhouse efficiency determination Hello Sir, I intend doing my Ph.D in the area of greenhouse engineering. That cultivating white yam during the dry season in Nigeria. In order to achieve this objective, i will need to construct a greenhouse of about 10 x 5 m. I am looking for a company...