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A note on the relationship between photosynthetically active radiation and light intensity

Bemerkungen zur Beziehung zwischen photosynthetisch aktiver Strahlung und Lichtintensität

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Summary

Photosynthetically active radiation (PAR) is a factor which is important for plant growth and development. Equally important is its quantification in order to determine evapotranspiration and dry matter production of field crops. As such information about PAR is lacking, a simple correlation between PAR and light intensity (LI) for New Delhi (28°35′N) was worked out for different seasons and for various times of the day. Significantly high positive correlations exist between PAR and LI (r ranging between 0.84 to 1.00) during monsoon season (July–September). Also during summer period (May–June) there was significant positive correlation between them (r = 0.84). The regression equation may be quite useful for evaluating PAR in different periods using LI data.

Zusammenfassung

Die photosynthetisch aktive Strahlung (PAR) ist ein für Pflanzenentwicklung und Wachstum wichtiger Faktor. Von gleicher Bedeutung ist deren Quantifizierung, um die Evapotranspiration und die biologische Massenproduktion bestimmen zu können. Da Angaben über PAR meist fehlen, wurde eine einfache Korrelation zwischen PAR und Lichtintensität (LI) für New Delhi (28°35′N) für verschiedene Jahres- und Tageszeiten erstellt. Signifikante, hohe Korrelationen zwischen PAR und LI (Koeffizienten zwischen 0.84 und 1.00) existieren während der Monsunperiode (Juli–September). Während des Sommers (Mai–Juni) existieren ebenfalls hohe Korrelationen (r = 0.84). Die Regressionsgleichungen können für eine Auswertung von PAR anhand von LI-Daten von Nutzen sein.

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References

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Authors and Affiliations

  1. Water Technology Center, I.A.R.I., 110012, New Delhi, India

    K. K. Nathan

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  1. K. K. Nathan
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Nathan, K.K. A note on the relationship between photosynthetically active radiation and light intensity. Arch. Met. Geoph. Biocl., Ser. B 35, 233–238 (1984). https://doi.org/10.1007/BF02263348

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  • DOI: https://doi.org/10.1007/BF02263348

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