LEAF AREA ESTIMATION IN LITCHI BY MEANS OF ALLOMETRIC RELATIONSHIPS

Obtaining leaf area is critical in several agronomic studies, being one of the important instruments to assess plant growth. The aim of this study was to estimate equations and select the most appropriate in determining leaf area in litchi (Litchi chinensis Sonn.). From the linear dimensions of length (L) and maximum width (W) of leaf limb, equations were estimated using linear, quadratic, potential and exponential models. The linear regression equation using the product of the length by maximum width, given by Y = 0.2885 + 0.662 (L.W) is the one that best expresses the leaf area estimation of litchi tree.

Index terms
Litchi chinensis Sonn.; leaf dimension; non-destructive method

Authorship

PABLO SOUTO OLIVEIRA

Agronomist, Graduate in Tropical Agriculture. Department of Agrarian and Biological Sciences, Federal University of Espírito Santo,University Center of Northern Espírito Santo, Rodovia BR 101 Norte, Km 60, Bairro Litorâneo, 29932-540, São Mateus, Espírito Santo, Brasil. pablosouto13@hotmail.com. Universidade Federal do Espírito SantoBrasilSão Mateus, ES, Brasil Agronomist, Graduate in Tropical Agriculture. Department of Agrarian and Biological Sciences, Federal University of Espírito Santo,University Center of Northern Espírito Santo, Rodovia BR 101 Norte, Km 60, Bairro Litorâneo, 29932-540, São Mateus, Espírito Santo, Brasil. pablosouto13@hotmail.com.

WILTON SILVA

Technology in Coffee Growing, Graduate in Tropical Agriculture. Department of Agrarian and Biological Sciences, Federal University of Espírito Santo, University Center of Northern Espírito Santo, Rodovia BR 101 Norte, Km 60, Bairro Litorâneo, 29932-540, São Mateus, Espírito Santo, Brasil. adriana.matta@hotmail.com;Universidade Federal do Espírito SantoBrasilSão Mateus, ES, BrasilTechnology in Coffee Growing, Graduate in Tropical Agriculture. Department of Agrarian and Biological Sciences, Federal University of Espírito Santo, University Center of Northern Espírito Santo, Rodovia BR 101 Norte, Km 60, Bairro Litorâneo, 29932-540, São Mateus, Espírito Santo, Brasil. adriana.matta@hotmail.com;

ADRIANA APARECIDA MATTA COSTA

Agronomist, PhD. Department of Agrarian and Biological Sciences, Federal University of Espírito Santo, University Center of Northern Espírito Santo, Rodovia BR 101 Norte- Km 60, Bairro Litorâneo, 29932-540, São Mateus, Espírito Santo, Brasil. e.romais.s@ gmail.com(autor para correspondência);Universidade Federal do Espírito SantoBrasilSão Mateus, ES, BrasilAgronomist, PhD. Department of Agrarian and Biological Sciences, Federal University of Espírito Santo, University Center of Northern Espírito Santo, Rodovia BR 101 Norte- Km 60, Bairro Litorâneo, 29932-540, São Mateus, Espírito Santo, Brasil. e.romais.s@ gmail.com(autor para correspondência);

EDILSON ROMAIS SCHMILDT

Agronomist, PhD. Department of Agrarian and Biological Sciences, Federal University of Espírito Santo, University Center of Northern Espírito Santo, Rodovia, BR 101 Norte, Km 60, Bairro Litorâneo, 29932-540, São Mateus, Espírito Santo, Brasil. edney. vitoria@ufes.br. Universidade Federal do Espírito SantoBrasilSão Mateus, ES, BrasilAgronomist, PhD. Department of Agrarian and Biological Sciences, Federal University of Espírito Santo, University Center of Northern Espírito Santo, Rodovia, BR 101 Norte, Km 60, Bairro Litorâneo, 29932-540, São Mateus, Espírito Santo, Brasil. edney. vitoria@ufes.br.

EDNEY LEANDRO DA VITÓRIA

SCIMAGO INSTITUTIONS RANKINGS

Figures | Tables | Formulas

Figures (1)
Tables (3)
Formulas (1)

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FIGURE 1
Litchi leaf area representation ?? (Litchi chinensis Sonn.) in the linear model for the product between length and maximum width (L.W) of leaves: A = equation estimated based on 400 leaves; B = model validation using 100 leaves.

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TABLE 1
Minimum, maximum, mean values and variation coefficient (VC, in %) of length (L in cm²), maximum width (W in cm²) and length times maximum width (L.W, in cm²), leaf limb and observed leaf area (OLA, in cm2) of Litchi (Litchi chinensis Sonn.).

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TABLE 2
Equations for leaf area determination using length (L), width (W) and length times width (L.W) as independent variables (x) and determination coefficient (R2) based on 400 Litchi leaves (Litchi chinensis Sonn.)

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TABLE 3
Linear (ß₀), angular (ß₁) and determination coefficients (r²) obtained in the adjusted regression between estimated (dependent variable) and observed leaf area (independent variable), mean error (E) mean absolute error (EAM), root mean square error (RQME) and Willmott’s d index (d) calculated based on estimated and observed leaf area of ??100 Litchi leaves (Litchi chinensis Sonn.)

Thumbnail

FIGURE 1 Litchi leaf area representation ?? (Litchi chinensis Sonn.) in the linear model for the product between length and maximum width (L.W) of leaves: A = equation estimated based on 400 leaves; B = model validation using 100 leaves.

TABLE 1 Minimum, maximum, mean values and variation coefficient (VC, in %) of length (L in cm²), maximum width (W in cm²) and length times maximum width (L.W, in cm²), leaf limb and observed leaf area (OLA, in cm2) of Litchi (Litchi chinensis Sonn.).

TABLE 2 Equations for leaf area determination using length (L), width (W) and length times width (L.W) as independent variables (x) and determination coefficient (R2) based on 400 Litchi leaves (Litchi chinensis Sonn.)

TABLE 3 Linear (ß₀), angular (ß₁) and determination coefficients (r²) obtained in the adjusted regression between estimated (dependent variable) and observed leaf area (independent variable), mean error (E) mean absolute error (EAM), root mean square error (RQME) and Willmott’s d index (d) calculated based on estimated and observed leaf area of ??100 Litchi leaves (Litchi chinensis Sonn.)

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LEAF AREA ESTIMATION IN LITCHI BY MEANS OF ALLOMETRIC RELATIONSHIPS

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