MEASURING THE LEAF AREA OF ROSE PLANT ROSA sp BY USING DIFFERENT REGRESSION EQUATIONS.

	MEASURING THE LEAF AREA OF ROSE PLANT ROSA sp BY USING DIFFERENT REGRESSION EQUATIONS.
journal of kerbala university
Article 1, Volume 6, Issue 1, 2010, Pages 114-119 PDF (0 K)
Abstract
The research targeted to find relationships of measured rose ( Rosa sp )bush, climbing and dwarf rose leaf area with length or width or length + width by applying linear regression equations yˆ= a+ bx or multiple linear regression with two independent variables yˆ= a+b1x1+b2x2 using length with width. The samples of bush rose leaves 162 leaves,412 leaves for climbing rose and 423 leaves for dwarf rose then all leaves of roses were scanned .The length, width and area of the leaves were determined using Digmizer Image Software version 3.7 after installed it on computer ,leaves length ranged from (1.32- 8.53)cm for bush rose and leaves width ranged from(0.39 – 6.03)cm and leaf area ranged from (0.28 – 33.68)cm ,for climbing rose leaves length ranged from(1- 6.90)cm ,leaves width(0.39- 5.43)cm and leaf area( 0.29- 8.84)cm for dwarf rose leaves length ranged from (0.60- 3.23)cm,leaves width( 0.29- 1.91)cm and the leaf area(0.22- 4.05)cm.Results showed that application of linear regression equation for leaf area using leaf length resulted an R2 for bush rose 0.93,climbing rose 0.87 and for dwarf rose 0.81, applying with width an R2 value decreased for climbing rose 0.73 while increased for both dwarf and bush rose 0.86 and 0.94. Applying length + width R2 increased for bush, climbing and dwarf rose 0.96, 0.93 and 0.91 .When using multiple regression equation there was no appreciable changes in R2compared with R2 resulted from using( length + width).Accordingly, it has been recommended that measuring ( length + width) and applying either of the following equations for bush rose [yˆ = - 4.38+1.769(x) (length +width) ( R2 = 0.96), or yˆ= -4.302+1.420(L)+2.284(W) ( length + width) ( R2 = 0.96)],for climbing rose applying either of the following equation[ yˆ = - 1.29+0.838 (x) (length + width) (R2 = 0.93) or yˆ= -1.44+0.944 (L)+0.697 (W) (length + width) ( R2 = 0.93 ) and applying equation yˆ= -1.25+0.606 (L)+1.443 (W) ( length + width) ( R2 = 0.93) ] for the rose plant leaf area .

Statistics Article View: 209 PDF Download: 39