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      APLICAÇÃO DO MÉTODO DE BALANÇO DE CALOR NA DETERMINAÇÃO DA TRANSPIRAÇÃO DE MUDAS DE LIMOEIRO

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          Abstract

          O método de balanço de calor é usado para monitorar fluxo de seiva em plantas de diversas espécies. Neste trabalho, estudou-se o desempenho e aplicabilidade do método, em mudas de limoeiro com diâmetros em torno de 18 mm. Os sensores foram avaliados em plantas envasadas, em casa de vegetação, sob condições naturais de temperatura e radiação solar. O desempenho do método foi avaliado comparando-se o fluxo de massa computado e as medidas gravimétricas de perda de massa, fazendo-se depois, análise de regressão. Os resultados indicam que os sensores tiveram uma precisão de 8% na escala horária e 11% na escala diária. A constante de tempo foi de 12 minutos, o que é um indicativo de que o método é adequado para medir fluxo de seiva em mudas de citros com boa precisão, e suficientemente apropriado para ser usado em aplicações agronômicas e fisiológicas.

          Translated abstract

          The heat balance method is widely used to measure sap flow of different plant species. This work focused on the performance and applicability of the method, using 2-year old lemon plants, with 18 mm in diameter, the sensors were evaluated on potted-plants in a greenhouse under natural temperature and solar radiation conditions. The method performance was tested by comparing the computed mass flow with weight losses. A regression equation was used to analyse the data collected. The results showed that sensor precision reached 8% in the hourly scale and 11% in the daily scale. The time constant of 12 minutes indicated that the method was accurate to measure sap flow with good precision. Also we concluded that the method is adequate for agronomic and physiological use.

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          Most cited references28

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          A Heat Balance Method for Measuring Water Flux in the Stem of Intact Plants

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            Improved thermal method of continual recording the transpiration flow rate dynamics

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              Improvement of the Probe for Measuring Water Flow Rate in Intact Plants with the Stem Heat Balance Method

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Journal
                sa
                Scientia Agricola
                Sci. agric. (Piracicaba, Braz.)
                São Paulo - Escola Superior de Agricultura "Luiz de Queiroz" (Piracicaba )
                1678-992X
                September 1997
                : 54
                : 3
                : 221-231
                Affiliations
                [1 ] Univ. Nacional Autónoma de Honduras
                [2 ] Universidade de São Paulo Brazil
                [3 ] Universidade de São Paulo Brazil
                [4 ] Universidade de São Paulo Brazil
                Article
                S0103-90161997000200018
                10.1590/S0103-90161997000200018
                281715e3-dd4f-4413-841d-210efb384668

                http://creativecommons.org/licenses/by/4.0/

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                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=0103-9016&lng=en
                Categories
                AGRICULTURE, MULTIDISCIPLINARY

                General agriculture
                stem gauge,sap flow,heat transfer,sensores de medida,fluxo de seiva,transferência de calor

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