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A interferencia das plantas daninhas, afeta os parâmetros de fisiologicos da cultura do feijao-caupi, com reflexo direto no crescimento e na produtividade. Assim, objetivou-se avaliar a atuacao de metodos de controle das plantas daninhas na cultura do feijao-caupi, identificando o mais eficiente, por meio do acompanhamento dos componentes de crescimento, sendo estes compostos de altura (cm), numero de folhas, diâmetro do caule (mm) e os aspectos fisiologicos da cultura, pela coleta de dados da taxa de assimilacao de CO 2 (μmol m -2 s -1 ), transpiracao (mmol de H 2 O m -2 s -1 ), condutância estomatica (mol de H 2 O m -2 s -1 ) e concentracao interna de CO 2 , com um analisador de gas infravermelho . O experimento foi realizado em condicoes de campo no Centro de Ciencias e Tecnologia Agroalimentar da Universidade Federal de Campina Grande, Campus Pombal, Paraiba. O delineamento experimental utilizado foi o de blocos ao acaso com oito tratamentos e quatro repeticoes em esquema fatorial 2 x 4, sendo os fatores: dois cultivares de feijao-caupi (BRS Marataoa e BRS Rouxinol) e quatro manejos das plantas daninhas (mecânico, quimico, fisico e sem controle). Os manejos quimico, mecânico e fisico, mostram-se superiores nos componentes de crescimento, nao afetando tais caracteristicas, sendo as trocas gasosas severamente afetadas. Physiological performance and growth of cowpea under weed management Abstract : The interference of weeds affects the physiological parameters of cowpea culture, with direct reflection on growth and productivity. The objective of this study was to evaluate the performance of different weed control methods in cowpea culture in order to identify the most efficient by monitoring the growth components, being these compounds of height (cm), number of leaves and diameter of the stem (mm) and the physiological aspects of the culture, by collecting data: CO2 assimilation rate (μmol m-2 s-1), transpiration (mmol H 2 O m -2 s -1 ), Stomatal conductance (mol of H 2 O m -2 s -1 ) and internal CO 2 concentration, with an infrared gas analyzer. The experiment was accomplished under field conditions at the Center for Agro-Food Science and Technology of the Federal University of Campina Grande, Campus Pombal, Paraiba . The experimental design was a randomized complete block design with eight treatments and four replications in a 2 x 4 factorial scheme, being these factors: two cultivars of cowpea (BRS Marataoa and BRS Rouxinol) and four weed management (mechanical, chemical , Physical and uncontrolled). Chemical, mechanical and physical management are shown to be superior in the growth components, not affecting these characteristics, being the gas exchanges severely affected.

Desempenho fisiológicos e crescimento do feijão-caupi, sob manejos de plantas daninhas