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Drift curves from spray applications on commom bean crop Translated title: Curvas de deriva de aplicações foliares na cultura do feijão

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      Abstract

      ABSTRACT In order to avoid the occurrence of drift in pesticide applications, it is fundamental to know the behavior of sprayed droplets. This study aimed to determine drift curves in pesticide applications on common bean crop under brazilian weather conditions, using different nozzle types and compared them with the "German" and "Dutch" drift prediction models. The experiment was conducted in Uberlândia, Minas Gerais/Brazil, in completely randomized design with ten replications and 4 x 20 split-plot arrangement in space. Drift deposited on collectors located over ground level was resulted by 150 L ha-1 carrier volume applications through four nozzle types (XR 11002 (fine droplets); AIXR 11002 (coarse droplets); TT 11002 (medium droplets); TTI 11002 (extremely coarse droplets)), collected in 20 downwind distances, parallel to the crop line outside the target area, spaced by 2.5 m. The tracer rhodamine B was added to the spray to be quantified by fluorimetry. Drift prediction models adjusted by exponential functions were obtained considering the 90th percentile for XR, TT, AIXR and TTI nozzles. It is suggested to use the estimated drift models from this study for each nozzle type in drift prediction evaluations on bean crops under brazilian weather conditions.

      Translated abstract

      RESUMO Uma das formas de se evitar a ocorrência de deriva durante as aplicações de produtos fitossanitários é conhecer o comportamento das gotas, antes mesmo de se realizar a pulverização. O trabalho objetivou estabelecer curvas de deriva para as culturas do feijão e nas condições climáticas brasileiras, em função da aplicação com diferentes pontas de pulverização, além de compará-las com os "Modelos Alemão e Holandês" de estimativa de deriva. O experimento foi conduzido no município de Uberlândia, MG/Brasil, em delineamento de blocos casualizados, num esquema de parcela subdividida no espaço 4 x 20, com 10 repetições. Foi mensurada a deriva depositada proveniente da pulverização terrestre, empregando uma taxa de aplicação de 150L ha-1 por quatro tipos de pontas (jato plano simples e com indução de ar - XR 11002 (gotas finas) e AIXR 11002 (gotas grossas); jato plano defletor simples e com indução de ar - TT 11002 (gotas médias) e TTI 11002 (gotas extremamente grossas), em 20 pontos amostrais diferentes (correspondentes à 20 distâncias, no sentido de deslocamento do vento, paralelas à linha de cultivo fora da área-alvo, espaçadas em 2,5 m). Para a avaliação dos depósitos em alvos de papel filtro junto ao solo, adicionou-se ao tanque do pulverizador montado de barras um marcador composto do corante Rodamina B para ser detectado por fluorimetria. Obteve-se quatro modelos de previsão de deriva para a cultura do feijão (pontas XR, TT, AIXR e TTI), análogos ao "Modelo Holandês", com tendência exponencial de quatro parâmetros, considerando o Percentil 90 (ajustes acima de 99%). Em avaliações de estimativa de deriva na cultura do feijão cultivado em condições climáticas brasileiras, sugere-se a utilização dos modelos de previsão de deriva gerados neste trabalho, para cada tipo de ponta de pulverização.

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      Sisvar: a computer statistical analysis system

      Sisvar is a statistical analysis system, first released in 1996 although its development began in 1994. The first version was done in the programming language Pascal and compiled with Borland Turbo Pascal 3. Sisvar was developed to achieve some specific goals. The first objective was to obtain software that could be used directly on the statistical experimental course of the Department of Exact Science at the Federal University of Lavras. The second objective was to initiate the development of a genuinely Brazilian free software program that met the demands and peculiarities of research conducted in the country. The third goal was to present statistical analysis software for the Brazilian scientific community that would allow research results to be analyzed efficiently and reliably. All of the initial goals were achieved. Sisvar gained acceptance by the scientific community because it provides reliable, accurate, precise, simple and robust results, and allows users a greater degree of interactivity.
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        Comparative Physiological Studies on the Growth of Field Crops: I. Variation in Net Assimilation Rate and Leaf Area between Species and Varieties, and within and between Years

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            Author and article information

            Affiliations
            [1 ] Universidade Federal de Uberlândia Brazil
            Contributors
            Role: ND
            Role: ND
            Role: ND
            Journal
            cagro
            Ciência e Agrotecnologia
            Ciênc. agrotec.
            Editora da Universidade Federal de Lavras
            1981-1829
            December 2016
            : 40
            : 6
            : 621-632
            S1413-70542016000600621 10.1590/1413-70542016406016716

            This work is licensed under a Creative Commons Attribution 4.0 International License.

            Product
            Product Information: SciELO Brazil
            Categories
            AGRICULTURE, MULTIDISCIPLINARY

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