Non-destructive Method of Leaf Area Estimation for Oleander (Nerium oleander L.) Cultivated in the Iraqi Kurdistan Region

Ikbal M. Al-Barzinji; Barham M. Amin

doi:10.14500/aro.10088

Ikbal M. Al-Barzinji Department of Biology, Faculty of Science and Health, Koya University, University Park, Danielle Mitterrand Boulevard, Koya KOY45, Kurdistan Region.
Barham M. Amin Department of Biology, Faculty of Science and Health, Koya University, University Park, Danielle Mitterrand Boulevard, Koya KOY45, Kurdistan Region.

Keywords: Leaf area estimation, Nerium oleander L., non-destructive methods, regression equations.

Abstract

This study was conducted in the Iraqi Kurdistan region in January 2014 to determine the individual leaf area of oleander (Nerium oleander L.) by easy, accurate, inexpensive, and nondestructive method. Simple, multiple and exponential regression analyses were used by length (L) and width (W) and their combinations as independent variables and with leaf area as dependent variable to determine more accurate models (high coefficient of determination and less MSE). The results showed that the best fitting models that show more accurate estimation of oleander leaf area, compared to other models, were the simple linear regression that depends on length multiple width for Koya and Erbil cities and the total leaves of the two cities plants. On the other hand, the best fitting multiple linear equations were those which depend on square length and square width for Koya city and the total leaves of the two cities plants, whereas for Erbil city the best model was that depends on leaves with square length and width. Multiple linear regressions were the more accurate among the models, followed by simple linear regression, whereas the exponential model had the lowest accuracy. All coefficients of regressions values were found to be significant at the P < 0.0001 level.

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Author Biographies

Ikbal M. Al-Barzinji, Department of Biology, Faculty of Science and Health, Koya University, University Park, Danielle Mitterrand Boulevard, Koya KOY45, Kurdistan Region.

Ikbal M. Tahir was a researcher in the State Board for Agricultural Research in Baghdad for fifteen years, then a lecturer in the college of Agriculture in Koya University for four academic years and finally an assistant professor in the biology department in the Faculty of Science and Health at Koya University since 2012 -2013 academic year. She has a MSc. and Ph.D degrees from Baghdad University in Horticulture field in the plant and post-harvest physiology. She has many researches in agriculture field.

Barham M. Amin, Department of Biology, Faculty of Science and Health, Koya University, University Park, Danielle Mitterrand Boulevard, Koya KOY45, Kurdistan Region.

Barham M. Amin has B.Sc. degree in biology from Koya University in 2014. He studied many relevant coursework including different biology branches, and he has an interest in conducting researches. Mr. Amin is a member at the Kurdistan Biology Syndicate.

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