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Production of “Mel” Papaya Seedlings under the Application of Different Irrigation Depths

Agricultural Sciences 2020年第10期11卷 921-931页

作者： Vinicius de Souza Oliveira Wilian Rodrigues Ribeiro Robson Prucoli Posse Francielly Valani Rodrigo Amaro de Salles Wellington Sergio Oliveira Jeniffer Ribeiro de Oliveira Geilson Silva Costa Sheila Cristina Prucoli Posse sara dousseau arantes Omar Schmildt Edilson Romais Schmildt Federal University of Espírito Santo—Center for Agricultural Sciences and Engineering Alegre Brazil Federal Institute of Espírito Santo—Campus Itapina Colatina Brazil Federal University of Espírito Santo—Center Noth of Espírito Santo S&#227 o Mateus Brazil Capixaba Institute for Research Technical Assistance and Rural Extension Vitória Brazil Capixaba Institute for Research Technical Assistance and Rural Extension Regional Center for Rural Development Linhares Brazil

Water management is considered one of the most prevalent factors in the production of quality seedlings in commercial crops. Despite the benefits provided, the technique is still little used by irrigating users, who, for the most part, do not adopt any criteria for water use. Thus, aiming at the rational use of water resources and increasing the productive potential of seedlings, the objective of this study was to evaluate the effect of different irrigation depths on the production of Formosa “Mel” papaya seedlings (Carica papaya L.). The experiment took place in a greenhouse, located at the Federal Institute of Espírito Santo, Campus Itapina, in Colatina, ES. The treatments consisted of six irrigation depths corresponding to 4, 6, 8, 10, 12 and 14 mm·day−1 adjusted in a completely randomized design, with 25 plants per treatment. The variables evaluated were: plant height, stem diameter, leaf area, dry mass of the aerial part, dry mass of the root system, total dry mass and Dickson’s Quality index, 58 days after sowing in all experimental plots. At the end of the experiment, it was found that the 7.36 mm·d−1 irrigation depth provided better quality, in addition to lower water consumption, being the most recommended for the production of Formosa “Mel” papaya seedlings.

关键词： Carica papaya L. Seedling Quality Water Management

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Modeling of the Leaf Area of <i>Maytenus obtusifolia</i>Mart. from Scanned Images

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Agricultural Sciences 2019年第6期10卷 796-806页

作者： Vinicius de Souza Oliveira Karina Tiemi Hassuda dos Santos Ana Paula Braido Pinheiro Gleyce Pereira Santos Jéssica Sayuri Hassuda Santos Hérica Chisté Omar Schmildt sara dousseau arantes Marcio Paulo Czepak Adriano Alves Fernandes Edilson Romais Schmildt Postgraduate Program in Tropical Agriculture Federal University of Espírito Santo S&#227 o Mateus ES Brazil Departament of Agrarian and Biological Sciences Federal University of Espírito Santo S&#227 o Mateus ES Brazil Capixaba Institute for Research Technical Assistance and Rural Extension Regional Center for Rural Development Linhares Brazil

The leaf has a vital role in the functions of the plant, being responsible for photosynthesis and gas exchange. Thus, the objective of this study was to fit a mathematical equation model to estimate the leaf area of Maytenus obtusifolia Mart. through the linear dimensions of the leaves. For that, six hundred and fifteen healthy leaves were collected from plants belonging to the Federal University of Espírito Santo, São Mateus Campus, in the municipality of São Mateus, located in the north of the State of Espírito Santo, Brazil. All leaves were digitized and the images processed using the ImageJ®software, obtaining the measurements of the maximum length of the main midrib (L), the maximum width of the leaf blade (W) and the real leaf area (RLA) of each sheet. Subsequently, the product of length and width multiplication (LW) was also obtained. 500 sheets were randomly separated for the generation of models of mathematical equations and their respective coefficient of determination (R2), where RLA was used as dependent variable as function of L, W or LW as independent variable. Based on the models generated, a 115 leaf sample was used for validation, where the L, W and LW values of this sample were replaced in the adjusted equations, thus obtaining the estimated leaf area (ELA). A comparison of the means of RLA and ELA was performed by Student’s t test at 5% probability. We also calculated the mean absolute error (MAE), the root mean square error (RMSE) and the Willmott index (d). The best equation was defined by the following criteria: non-significant values of RLA and ELA averages, R2 and index d closest to unit, and MAE and RMSE values with greater proximity to zero. The quadratic model equation represented by ELA=0.18122798+0.72847767(LW)+0.00002789(LW)2 generated by multiplying the length with the width (LW) is the most suitable for the estimation of the leaf area of Maytenus obtusifolia Mart., in a fast, safe and non-destructive way.

关键词： Maytenus obtusifolia Mart Non-Destructive Method Mathematical Equations

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