The objective of this work was to verify the response of basil cultivars to the salinity of irrigation water during the period from January 15 to March 20, 2013, in a greenhouse, at the Federal Rural University of the Semi-Arid, Mossoró, RN, Brazil. The experimental design was completely randomized, with treatments arranged in 2 x 4 factorial scheme, constituted of two cultivars of basil (‘Verde’ and ‘Roxo’) and four levels of irrigation water salinity (0.5; 2.0; 3.5 and 5.0 dS m-1), with four replicates. The plants were collected at 65 days after transplanting and the following variables were evaluated: stem diameter; plant height; number of stems and leaves; leaf area; dry matter of leaves, stems, roots, and total dry matter. The increase in salinity was detrimental to all variables evaluated in both cultivars, but the cultivar ‘Roxo’ proved to be more tolerant than the cultivar ‘Verde’. Both cultivars are tolerant to irrigation water salinity of up to 1.5 dS m-1.
Interação entre salinidade e fontes de nitrogênio no desenvolvimento inicial da cultura do girassol RESUMO O trabalho foi desenvolvido com o objetivo de avaliar o efeito da salinidade e de diferentes fontes de nitrogênio no desenvolvimento inicial do girassol. O delineamento utilizado foi o inteiramente casualizado, no esquema fatorial 3 x 5, com quatro repetições. O primeiro fator foi composto por diferentes fontes de nitrogênio (uréia, sulfato de amônio e nitrato de cálcio), correspondendo a uma dose de 100 mg dm -3 ; e o segundo fator foi composto por diferentes níveis de salinidade da água de irrigação (0,5; 1,5; 2,5; 3,5 e 4,5 dS m -1 ). Foram avaliados a altura, o número de folhas, a área foliar e a massa da matéria seca total. O desenvolvimento vegetativo do girassol foi influenciado pela salinidade da água de irrigação e pelas fontes de nitrogênio. O número de folhas, a área foliar e a massa da matéria seca total foram reduzidos linearmente em resposta ao incremento da salinidade. A aplicação de sulfato de amônio favorece o maior desenvolvimento foliar das plantas. Palavras-chave:Helianthus annus L., adubação nitrogenada, estresse salino. Interaction between salinity and nitrogen sources in the initial development of sunflower crop ABSTRACTThis work was developed aiming at evaluating the effect of salinity and nitrogen sources on the initial development of the sunflower. The experimental design used was completely randomized, arranged in a factorial scheme 3 x 5, with four replications. The first factor was composed by different nitrogen sources (urea, ammonium sulfate and calcium nitrate), corresponding to an N rate of 100 mg dm -3 ; and the second factor was composed by different salinity levels of the irrigation water (0.5; 1.5; 2.5; 3.5 and 4.5 dS m -1 ). The following parameters were evaluated: plant height, leaf number, leaf area and total dry mass weight. The vegetative development of the sunflower was influenced by both the salinity of the irrigation water and nitrogen sources. Leaf number, leaf area and total dry mass weight were affected by salinity. Fertilization with ammonium sulfate favors higher development of plants.
RESUMOEste experimento foi conduzido com o objetivo de avaliar o efeito de diferentes concentrações iônicas da solução nutritiva sobre o desenvolvimento do maxixeiro cultivado em substrato, nas condições climáticas de Mossoró, RN. O delineamento utilizado foi inteiramente casualizado, com sete tratamentos e quatro repetições. Os tratamentos foram constituídos por sete soluções nutritivas, tendo como base as soluções recomendadas para o meloeiro e para o pepineiro [melão: S 1 -50%, S 2 -100% e S 3 -150%; pepino: S 4 -50%, S 5 -100% e S 6 -150%; e S 7 (média de S 2 e S 5 )]. As soluções nutritivas interferiram praticamente em todos os parâmetros avaliados. As soluções nutritivas S 2 e S 5 , correspondentes às soluções recomendadas para as culturas do meloeiro e pepineiro, respectivamente, podem ser recomendadas para a cultura do maxixeiro cultivado em substrato de fibra de coco. Palavras-chave:Cucumis anguria L., cultivo sem solo, hidroponia, nutrição mineral Development of gherkin plant cultivated in substrate fertigated with different nutritive solutions ABSTRACTThis experiment was conducted to evaluate the effect of different ionic concentrations of the nutrient solution on the development of gherkin grown in substrate under climatic conditions of Mossoró, in the state of Rio Grande do Norte, Brazil. The experimental design was completely randomized with seven treatments and four replications. The treatments consisted of seven nutrient solutions, based on the solutions for melon and cucumber [Melon: S 1 -50%, S 2 -100% and S 3 -150%; cucumber: S 4 -50%, S 5 -100% and S 6 -150%, and S 7 (mean of S 2 and S 5 )]. The nutrient solutions interfered in almost all parameters evaluated. The nutrient solutions S 2 and S 5 , corresponding recommended solutions for the crops of melon and cucumber, respectively, can be recommended for the cultivation of gherkin grown in coconut fiber substrate.
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