Deriving the Leaf Area Index of Silage Maize Using Digital Hemispherical Photography Method (Case Study: Qaleh-Now Farms, South of Tehran)

Document Type : Research Paper

Authors

1 PhD student of Remote sensing, Department of Remote Sensing and GIS, Faculty of Geography, University of Tehran, Tehran, Iran.

2 Associate professor, Department of Remote sensing and GIS, Faculty of Geography, University of Tehran, Tehran, IRAN.

3 Associate professor, Department of Remote Sensing and GIS, Faculty of Geography, University of Tehran, Tehran, Iran

4 Associate professor, Department of Remote Sensing and GIS, Faculty of Geography, University of Tehran, Tehran, Iran.

5 Assistant professor, Department of Agro-ecology, Environmental Sciences Research Institute, Shahid Beheshti University, G.C, Tehran, Iran

6 Institute of Methodologies for Environmental Analysis (CNR IMAA), C.da S.Loja snc, 85050 Tito (Potenza), Italy

Abstract

The present study aimed to evaluate the efficiency of digital hemispherical photography (DHP) in deriving LAI in silage maize farms in the south of Tehran. For this purpose, the DHP as well as destructive measurements for comparison were used to estimate LAI in silage maize farms in Qaleh-Now County in the south of Tehran in 2018 considering the nature of spatio-temporal variability in agricultural fields during a growing season. The results showed LAI obtained through DHP at different periods of plant growth has a strong linear correlation with the values measured by the destructive method (R2 = 0.92, RMSE = 0.45 and Bias = 0.31). However, the intermediate LAI range (LAI: 2 -

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