Gas exchange and growth of peanut crop subjected to saline and water stress/Trocas gasosas e crescimento do amendoim submetido ao estresse salino e hidrico

HIGHLIGHTS: Peanut crops was not affected by the interactive effects of water and salt stress. Water stress reduced plant height and stem diameter of peanut crop. Increased irrigation water salinity negatively affected transpiration and leaf temperature. Peanut crops are of great economic interest b...

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Veröffentlicht in:Revista brasileira de engenharia agrícola e ambiental 2022-08, Vol.26 (8), p.557
Hauptverfasser: Barbosa, Andreza S, Sousa, Geocleber G. de, Freire, Marcio H. da C, Leite, Kelly N, Silva, Fred D.B. da, Viana, Tales V. de A
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Sprache:eng
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Zusammenfassung:HIGHLIGHTS: Peanut crops was not affected by the interactive effects of water and salt stress. Water stress reduced plant height and stem diameter of peanut crop. Increased irrigation water salinity negatively affected transpiration and leaf temperature. Peanut crops are of great economic interest because their seeds are used as an important source of vegetable protein and edible oil. The objective of this study was to evaluate the physiological indices and growth of peanut crops subjected to saline and water stress. The experiment was conducted in Auroras, Redencao, Ceara, Brazil using a completely randomized split plot statistical design. The plots were composed of irrigation water treatments with varying levels of electrical conductivity - ECw (1.0, 2.0, 3.0, 4.0 and 5.0 dS [m.sup.-1]), while the subplots were formed by the water regimes of 50% and 100% crop evapotranspiration. Plant height, leaf number, shoot dry matter, relative chlorophyll level, transpiration, and leaf temperature were affected by salt stress. The water regime of 100% ETc provided better performance for the variables stem diameter, leaf number, and shoot dry mass of peanuts. Key words: Arachis hypogaea L., water quality, water restriction A cultura do amendoim apresenta grande interesse economico, em decorrencia de suas sementes, constituirem importante fonte de proteina vegetal e de oleo comestivel. O objetivo do presente trabalho foi avaliar a fisiologia e crescimento da cultura do amendoim submetido a estresse salino e hidrico. O experimento foi conduzido em Auroras, Redencao, Ceara, Brasil. O delineamento experimental foi inteiramente casualizado em parcelas subdivididas, cujas parcelas referem-se aos niveis de condutividade eletrica da agua de irrigacao - CEa (1,0; 2,0; 3,0; 4,0 e 5,0 dS [m.sup.-1]) e as subparcelas aos regimes hidricos de 50 e 100% da evapotranspiracao da cultura. O estresse salino afeta negativamente a altura de planta, numero de folhas e massa seca da parte aerea, indices relativos de clorofla, transpiracao e a temperatura foliar da cultura do amendoim. O regime hidrico de 100% da ETc proporcionou maiores desempenhos para as variaveis diametro do caule, numero de folhas e massa seca da parte aerea da cultura do amendoim. Palavras-chave: Arachis hypogaea L., qualidade da agua, restricao hidrica
ISSN:1415-4366
DOI:10.1590/1807-1929/agriambi.v26n8p557-563