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	Provedor de dados Scientia Agricola (2) Autor Sánchez-Hermosilla,Julián (2) Agüera,Francisco (1) Carvajal,Fernando (1) Nuyttens,David (1) Páez,Francisco (1) Pérez-Alonso,José (1) Rincón,Víctor J. (1) Mais... Palavra-chave Modeling (1) Pesticides application (1) Tipo do documento Info:eu-repo/semantics/article (2) Ano 2013 (1) 2012 (1) País Brazil (2) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Fractal analysis of agricultural nozzles spray Scientia Agricola Agüera,Francisco; Nuyttens,David; Carvajal,Fernando; Sánchez-Hermosilla,Julián. Fractal scaling of the exponential type is used to establish the cumulative volume (V) distribution applied through agricultural spray nozzles in size x droplets, smaller than the characteristic size X. From exponent d, we deduced the fractal dimension (Df) which measures the degree of irregularity of the medium. This property is known as 'self-similarity'. Assuming that the droplet set from a spray nozzle is self-similar, the objectives of this study were to develop a methodology for calculating a Df factor associated with a given nozzle and to determine regression coefficients in order to predict droplet spectra factors from a nozzle, taking into account its own Df and pressure operating. Based on the iterated function system, we developed an algorithm... Tipo: Info:eu-repo/semantics/article Palavras-chave: Pesticides application; Modeling. Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162012000100002 Volume application rate adapted to the canopy size in greenhouse tomato crops Scientia Agricola Sánchez-Hermosilla,Julián; Páez,Francisco; Rincón,Víctor J.; Pérez-Alonso,José. The application rate of plant-protection products is indicated as a concentration or amount of product per area. Greenhouse crops grow swiftly, and an application rate based on a fixed amount of product per hectare can result either in large losses and overdoses when the plants are small or to be insufficient when the plants are fully developed. To solve these problems, the application rates of plant-protection products need to be adapted to the plant mass present in the greenhouse when the spray is applied. Two models were developed to estimate the leaf area based on easily measured geometric data of the vegetation in a greenhouse tomato crop. The model based on the PRV (Plant Row Volume) had that best results. The calculation of the volume application... Tipo: Info:eu-repo/semantics/article Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162013000600003 Registros recuperados: 2 Primeira ... 1 ... Última

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