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O objetivo deste trabalho foi modelar a área foliar de mucuna cinza determinada por fotos digitais em função das dimensões do limbo do folíolo central da folha. Foi conduzido um experimento de 256m² com a cultura de mucuna cinza em área experimental da Universidade Federal de Santa Maria. Em seis períodos de desenvolvimento da cultura (29, 43, 57, 73, 87 e 101 dias após a emergência), foram coletadas, aleatoriamente, o total de 790 folhas. Cada folha é composta pelos folíolos esquerdo, central e direito. Nessas 790 folhas, foi mensurado o comprimento (CFC) e a largura (LFC) e calculado o produto do comprimento vezes a largura (CFC×LFC) do limbo do folíolo central. A seguir, determinou-se a área foliar (soma da área foliar dos folíolos esquerdo, central e direito) por meio do método de fotos digitais (Y). Posteriormente, separou-se, aleatoriamente, 650 folhas para a construção de modelos do tipo quadrático, potência e linear, de Y em função do CFC, da LFC, e/ou do CFC×LFC, e 140 folhas para a validação dos modelos. Em mucuna cinza, o modelo potência (Ŷ=3,6450x1,9479, R²=0,9886) com base na largura do limbo do folíolo central é adequado para estimar a área foliar obtida por fotos digitais.The objective of this research was to model the leaf area of velvet bean determined by digital photos with the dimensions of the central leaflet limb of the leaf. A experiment of 256m² was conducted with the culture of velvet bean in the Universidade Federal de Santa Maria. In six periods of culture development (29, 43, 57, 73, 87 and 101 days after emergence) were collected, randomly, 790 leaves. Each leaf is composed of the left, center and right leaflets. In these 790 leaves were measured the length (CFC) and width (LFC) and calculated the product length width (CFC×LFC) of the central leaflet. It was determined the leaf area (the leaf area sum of the left, center and right leaflets) by the method of digital photos (Y). Later, 650 leaves were randomly separated, to build the quadratic model, potency and linear of Y in function of the CFC, LFC and/or CFC×LFC. It was used 140 leaves for validation. The potency model of leaf area obtained by method of digital photos (Ŷ=3.6450 x1.9479, R²=0.9886) based on the width central leaflet, is adequate to estimate leaf area in velvet bean.

The objective of this research was to model the leaf area of velvet bean determined by digital photos with the dimensions of the central leaflet limb of the leaf. A experiment of 256m² was conducted with the culture of velvet bean in the Universidade Federal de Santa Maria. In six periods of culture development (29, 43, 57, 73, 87 and 101 days after emergence) were collected, randomly, 790 leaves. Each leaf is composed of the left, center and right leaflets. In these 790 leaves were measured the length (CFC) and width (LFC) and calculated the product length width (CFC×LFC) of the central leaflet. It was determined the leaf area (the leaf area sum of the left, center and right leaflets) by the method of digital photos (Y). Later, 650 leaves were randomly separated, to build the quadratic model, potency and linear of Y in function of the CFC, LFC and/or CFC×LFC. It was used 140 leaves for validation. The potency model of leaf area obtained by method of digital photos (Ŷ=3.6450 x1.9479, R²=0.9886) based on the width central leaflet, is adequate to estimate leaf area in velvet bean. [ABSTRACT FROM AUTHOR]