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Çѱ¹»ý¹°È¯°æÁ¶ÀýÇÐȸ / v.11, no.2, 2002³â, pp.56-60
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( Relationship between Total Solar Radiation and PPF, and Transmittance in Greenhouse at Different Weather Conditions ) |
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| Since the transmittance of solar radiation directly affected by the structural frames of greenhouse can be changed according to the ratio of diffuse to direct radiations, it is necessary to investigate the transmittance of greenhouse at the different weather conditions. We can easily get the data of total solar radiation from the Meteorological Administration, but we have to personally measure the photosynthetic photon flux (PPF). If the relationship between total solar radiation and PPF is established, the PPF can be simply acquired from the relationship. Sol it is required to develop the equation to calculate PPF depending on weather condition. This study was conducted to determine the transmittance of PPF at canopy level in glasshouse and the correlation between total solar radiation and PPF at clear and cloudy days. The variation phase of greenhouse transmittance at clear day was very different from that at cloudy day. It was concluded that the proper transmittance, depending on the weather condition, should be adopted to calculate the accurate total solar radiation and PPF in greenhouse. The transmittance of solar radiation was the same as that of PPF in greenhouse. It was confirmed that the ratio of PPF to total radiation increased as the amount of cloud increased. The correlation between the hourly total solar radiation and PPF was derived. |
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| ±â»óÁ¶°Ç;½Ã°£´ç ÀüõÀϻ緮;½Ã°£´ç ±¤ÇÕ¼ºÀ¯È¿±¤·®ÀÚ¼Ó;¿î·®;weather condition;hourly total solar radiation;hourly solar PPF;amount of cloud; |
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»ý¹°È¯°æÁ¶ÀýÇÐȸÁö / v.11, no.2, 2002³â, pp.56-60
Çѱ¹»ý¹°È¯°æÁ¶ÀýÇÐȸ
ISSN : 1229-4675
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO200211921033323)
¾ð¾î : Çѱ¹¾î |
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| ³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø |
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