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The annual variation of photosynthetically active radiation (PAR) measured over five (5) years period (2005)(2006)(2007)(2008)(2009)(2010) at Ilorin (8 0 32’N, 4 0 34’E) was studied. The average daily and weekly PAR were obtained and plotted. The behavior of average daily PAR is similar to that obtained for the weekly average. There is a daily and weekly fluctuation in PAR throughout the year. The highest value of PAR is 33.96MJ/m 2 /day which occurred during the Harmattan period and minimum during the rain period with a value of 22.816MJ/m 2 /day. The average PAR for the Harmattan and Rain period is found to be 37.585 and 29.125MJ/m 2 /day respectively, while the average annual PAR is 30.050MJ/m 2 /day. When PAR is plotted against days of the year, the plot is described by a logarithm fit as y= -1.39ln(x) + 39.91 with a weak correlation R 2 = 0.387. Also, when PAR is plotted against weeks of the year, the plot is best described by a logarithm fit as y= -1.56ln(x) + 34.74 with correlation R 2 = 0.524.
Banjoko I.K. 2013. \u201cVariation Characteristics of Photosynthetically Active Radition (Par) Over Ilorin in the Tropics\u201d. Global Journal of Science Frontier Research - A: Physics & Space Science GJSFR-A Volume 12 (GJSFR Volume 12 Issue A8): .
Crossref Journal DOI 10.17406/GJSFR
Print ISSN 0975-5896
e-ISSN 2249-4626
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Total Score: 107
Country: Nigeria
Subject: Global Journal of Science Frontier Research - A: Physics & Space Science
Authors: Dr. Ibrahim B.B, Usman.A (PhD/Dr. count: 1)
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Publish Date: 2013 01, Thu
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The annual variation of photosynthetically active radiation (PAR) measured over five (5) years period (2005)(2006)(2007)(2008)(2009)(2010) at Ilorin (8 0 32’N, 4 0 34’E) was studied. The average daily and weekly PAR were obtained and plotted. The behavior of average daily PAR is similar to that obtained for the weekly average. There is a daily and weekly fluctuation in PAR throughout the year. The highest value of PAR is 33.96MJ/m 2 /day which occurred during the Harmattan period and minimum during the rain period with a value of 22.816MJ/m 2 /day. The average PAR for the Harmattan and Rain period is found to be 37.585 and 29.125MJ/m 2 /day respectively, while the average annual PAR is 30.050MJ/m 2 /day. When PAR is plotted against days of the year, the plot is described by a logarithm fit as y= -1.39ln(x) + 39.91 with a weak correlation R 2 = 0.387. Also, when PAR is plotted against weeks of the year, the plot is best described by a logarithm fit as y= -1.56ln(x) + 34.74 with correlation R 2 = 0.524.
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