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Modeling individual leaf area of ginger (Zingiber officinale Roscoe) using leaf length and width

DSpice at Indian Institute of Spices Research

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Creator KANDIANNAN, K
UTPALA PARTHASARATHY
KRISHNAMURTHY, K S
THANKAMANI, C K
SRINIVASAN, V
 
Date 2011-10-27T17:55:01Z
2011-10-27T17:55:01Z
2009
 
Identifier Scientia Horticulturae 120 (4): 532–537 (2009).
http://hdl.handle.net/123456789/697
 
Description Leaf area estimation is an important biometrical observation one has to do for comparing plant growth in field and pot experiments. In this study, a leaf area estimation model was developed for ginger (Zingiber officinale Roscoe), using linear measurements of leaf length (L) and maximum width (W). Leaves from five ginger varieties (Varada, Rejatha, Mahima, Maran and Himachal) were used to develop the model in 2006–2007. The actual leaf area (LA) was measured with a leaf area meter (LI-3100, LI-COR, Lincoln, NE, USA) and taken as reference LA. The linear measurements were used to build linear (LA = a + b x L x W) and power models (LA = a x (L x W)b) for each variety, as the modeling among variety were not
different from each other, data for all five varieties have been pooled and compared with earlier models
by graphical procedures and statistical criteria such as Mean Square Error (MSE), Root Mean Square Error
(RMSE) and Chi-square (x2). The selected model was validated during 2007–2008. The validation data set was used to produce a validation model for each variety by re-estimating the model parameters to develop the estimation model and the models were compared for consistency. The predicted LA (PLA) was compared with observed LA (OLA) by graphical procedures and lack of agreement was evaluated by calculating the relative bias, estimated by the mean of differences (d) and the standard deviation (SD) of
the differences. Normality test was carried out by Spearman’s rank correlation coefficient (rs) and
residuals were normally distributed. Finally, the proposed model for leaf area estimation of ginger is
LA = _0.0146 + 0.6621 x L x W, R2 = 0.997. This model can be reliably used for estimating leaf area of ginger non-destructively. The same equation can be extrapolated to all varieties and land races of ginger as it is vegetatively propagated crop with narrow genetic variability.
 
Format 1196105 bytes
application/pdf
 
Language en
 
Subject Ginger
Leaf area estimation
Model
Non-destructive method
Zingiber officinale Roscoe
 
Title Modeling individual leaf area of ginger (Zingiber officinale Roscoe) using leaf length and width
 
Type Article