Abstract
The objective of this work was to propose models of equations from measurements of the linear dimensions of the last leaflet for the estimation of the leaf area of the composite leaves of Canavalia rosea. For this purpose, 441 composite leaves of 198 seedlings were used, 45 days after sowing, produced in nursery and belonging to the Federal University of Espírito Santo, Campus São Mateus, located in the municipality of São Mateus, North of the State of Espírito Santo, Brazil. The length (L) along the main midrib and the maximum leaf width (W) of the last leaflet of each composite leaf, as well as the leaf area of all leaflets, were measured. Subsequently, it was determined the product of the multiplication of the length with the width (LW) and leaf area observed (OLA) from the sum of leaf area of leaflets in front of these measures were adjusted linear and non-linear equations of linear first degree, quadratic and power models, where, OLA was used as a dependent variable in function of L, W and LW as independent variable. Based on the models tested, we obtained equations for the estimated leaf area (ELA). The mean values of ELA and OLA were compared by Student's t test 5% probability. The mean absolute error (MAE), the root mean square error (RMSE) and the Willmott d index, were determined as criteria for validation. The best adjusted equation was chosen through the non-significant values in the comparison of the means of ELA and OLA, values of MAE and RMSE closer to zero, value of the index d near the unitary and higher values of R2. Thus, the leaf area of the composite leaf of C. rosea seedlings can be estimated by the power model represented by equation ELA = 2.2951 (LW)0.9474 quickly, easily and non-destructively.
Highlights
Canavalia rosea is a species of restinga, belonging to the family Leguminosae, popularly known as beach beans (Vatanparast, 2010)
For the accomplishment of the present study were used 441 leaves composed of 198 Canavalia rosea seedlings obtained in nursery,belonging to the Federal University of Espírito Santo, Campus São Mateus, located in the municipality of São Mateus, North of the State of Espírito Santo, Brazil, with geographic coordinates of 18o40′36′′ south latitude and 39o51′35′′ longitude East
The leafs sampled for model adjustment and data validation presented a high amplitude for length (L), width (W), product of length with width (LW) and leaf area observed (Table 1)
Summary
Canavalia rosea is a species of restinga, belonging to the family Leguminosae, popularly known as beach beans (Vatanparast, 2010). Its importance varies from food consumption, until the use as fodder, fertilizers, bioactive compounds, pharmaceutical industry, soil establishment and erosion control (Sridhar & Bhagya, 2007; Mohajer, Taha, Mohamed, & Razak, 2017). Due to the intense relationship between the leaves and the physiological processes, it is essential to estimate the leaf area in a simple and precise manner in ecological and agronomic studies, involving plant growth and development, light interception, photosynthetic efficiency, evapotranspiration and responses related to fertilizers and irrigation (Blanco & Folegatti, 2005; Spann & Heerema, 2010). There are different ways of determining the leaf area of a plant, ranging from direct methods to indirect methods (Carvalho, Toebe, Tartaglio, Bandeira, & Tambara, 2017).
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