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2023-04-12T12:07:29Z2023-04-12T12:07:29Z2021-07-14108e36010817256https://doi.org/10.33448/rsd-v10i8.172562525-3409http://hdl.handle.net/1843/51852A competição com plantas daninhas por água ou luz pode afetar parâmetros fisiológicos das culturas de interesse. A partir desse estudo, objetivou-se avaliar o efeito da umidade do solo e a competição de duas espécies de plantas daninhas em diferentes combinações nas características fisiológicas de plantas de eucalipto. O delineamento experimental utilizado foi ao acaso com quatro repetições em esquema fatorial 4 x 4. O primeiro fator correspondeu às combinações de plantas do híbrido clonal de eucalipto cultivadas em competição com picão-preto e braquiária: 1 -Uma planta de eucalipto + duas plantas de braquiária por vaso; 2 -Uma planta de eucalipto + duas de picão-preto por vaso; 3 - Uma planta de eucalipto + uma planta de picão-preto + uma planta de braquiária por vaso, e; 4 -uma planta de eucalipto por vaso. O segundo correspondeu aos níveis de água no solo: 100, 74, 67 e 60% da capacidade de campo. Foram feitas avaliações dos teores de clorofila a, b, a/be total, bem como, variáveis relacionadas a fluorescência da clorofila. O eucalipto crescendo isoladamente mostrou maiores valores de clorofila a clorofila b e clorofila total. A relação clorofila a/ b foi inferior em todos os níveis de umidade do solo. A fluorescência inicial mostrou tendência de decréscimo com o aumento da umidade. Nas menores umidades testadas as plantas de eucalipto se encontravam em condição de estresse com valores de fluorescência variável/fluorescência máxima inferiores a 0,75.Competition with weeds for water or light can affect physiological parameters of the crops of interest. From this study, the objective was to evaluate the effect of soil moisture and the competition of two weed species in different combinations on the physiological characteristics of eucalyptus plants. The experimental design used was randomized with four replications in a 4 x 4 factorial scheme. The first factor corresponded to the combinations of eucalyptus clonal hybrid plants grown in competition with black sting and brachiaria: 1 - One eucalyptus plant + two brachiaria plants per pot; 2 - One eucalyptus plant + two black sting per pot; 3 - One eucalyptus plant + one black sting plant + one brachiaria plant per pot, and; 4 - one eucalyptus plant per pot. The second corresponded to soil water levels: 100, 74, 67 and 60% of field capacity. Evaluations of chlorophyll a, b, a/b and total contents were made, as well as variables related to chlorophyll fluorescence. The eucalyptus growing alone showed higher values of chlorophyll a chlorophyll b and total chlorophyll. The chlorophyll a/b ratio was lower at all soil moisture levels. The initial fluorescence showed a tendency to decrease with increasing humidity. At the lowest moisture levels tested, the eucalyptus plants were under stress condition with variable fluorescence/maximum fluorescence values below 0.75.FAPEMIG - Fundação de Amparo à Pesquisa do Estado de Minas GeraisCAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível SuperiorporUniversidade Federal de Minas GeraisUFMGBrasilICA - INSTITUTO DE CIÊNCIAS AGRÁRIASResearch, Society and DevelopmentSolos - UmidadeFisiologia vegetalEucaliptoErvas daninhasClorofilaFotossínteseBidens pilosaUrochloa brizanthaFluorescência da clorofilaFotossínteseEfeito da umidade do solo na fisiologia do eucalipto em competição com plantas daninhasEffect of soil moisture on the physiology of eucalyptus in competition with weedsEfecto de la humedad del suelo sobre la fisiología del eucalipto en competencia con las malezasinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttps://rsdjournal.org/index.php/rsd/article/view/17256Brenda Thaís Barbalho AlencarEvander Alves FerreiraTayna Sousa DuqueJosiane Costa MacielMaria Sebastiana Carmindo da SilvaJosiely Borges de SouzaDébora Sampaio MendesDaniela Keley CustódioCássia Michelle CabralRegynaldo Arruda Sampaioinfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da UFMGinstname:Universidade Federal de Minas Gerais (UFMG)instacron:UFMGORIGINALEfeito da umidade dosolo na fisiologia do eucalipto em competição com plantas daninhas.pdfEfeito da umidade dosolo na fisiologia do eucalipto em competição com plantas daninhas.pdfapplication/pdf234747https://repositorio.ufmg.br/bitstream/1843/51852/2/Efeito%20da%20umidade%20dosolo%20na%20fisiologia%20do%20eucalipto%20em%20competi%c3%a7%c3%a3o%20com%20plantas%20daninhas.pdf5c29e075259bfd7ed1104672212cdb4fMD52LICENSELicense.txtLicense.txttext/plain; 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