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No período de novembro de 2000 e fevereiro de 2001, estudaram-se os efeitos da salinidade da água de irrigação aos níveis de 0,5; 1,0; 2,0; 3,0; 4,5 e 6,0 dS m-1 e dos volumes de substrato: 0,34 e 1,41 L sobre a germinação de sementes e algumas variáveis de crescimento inicial em plantas de maracujá-amarelo e roxo (Passiflora edulis f. flavicarpa Deg). Os resultados mostraram que, independentemente da cultivar, apesar de a água salina inibir a germinação e o desenvolvimento das plantas, os efeitos foram mais danosos nos tratamentos com menor volume do substrato. Ambos os genótipos sofreram mais a ação da salinidade durante o crescimento inicial avaliado pela altura, diâmetro do caule, área foliar, crescimento da raiz principal e biomassa das raízes e parte aérea, que por ocasião da germinação das sementes. As mudas irrigadas com águas de condutividade elétrica superior a 1,0 dS m-1 não apresentaram qualidade para plantio. An experiment was carried out in order to evaluate the effects of saline water at levels: 0.5; 1.0; 2.0; 3.0; 4.5 and 6.0 dS m-1 of electric conductivity and the effects of substrate volume of 0.34 and 1.41 liter on seed germination and some variables of initial growth in passion fruit plants ( Passiflora edulis f. flavicarpa Deg) cultivars yellow and purple, during November of 2000 and February of 2001. The data showed that the saline content of the water irrigation inhibited the seed germination process and the initial growth of the passion fruit plants although they have been more drastic in treatment with smaller volumes of substrate. The action of saline water produced an effect more harmful to plants growth than during the seed germination of both genotypes evaluated by height growth, stem diameter, leaf area, primary root growth and dry matter production of roots and area part of the plants. The seedling irrigated with water of electric conductivity higher than 1.0 dS m-1 didn't present agronomic qualities to planting

Germinação de sementes e crescimento inicial de maracujazeiros irrigados com água salina em diferentes volumes de substrato