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| omparative Analysis of Radiative and Temperature Environments between PO and PE Greenhouses |
| CHENG Qiang，LIU Si-ying，QU Mei，GAO Li-hong |
| College of Agronomy and Biotechnology，China Agricultural University，Beijing 100193，China |
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Abstract The radiative and temperature environments of PO and PE greenhouses in winter were examined to compare and evaluate the influences of PO and PE films on radiative and temperature environments．The results indicated that the transmittance of solar radiation in PO greenhouse is 4.5-4.7 percentage point higher than that of PE greenhouse．The average daily temperature，the highest temperature and lowest temperature in PO greenhouse is generally 1 ℃ higher than in PE greenhouse．The temperature difference in sunny days in PO greenhouse is bigger than in gloomy days．It might up to over 2 ℃，and PO film has very good heat-insulating property．The 10 cm and 20 cm ground temperatures in PO greenhouse can be maintained between 13-18 ℃，2 ℃ higher than that in PE greenhouse．
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Received: 03 August 2011
Published: 10 October 2010
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