RESUMOCom a disseminação do vírus do endurecimento dos frutos do maracujazeiro amarelo, surge a necessidade de produção de mudas maiores e mais vigorosas. Atualmente, há carência de informações sobre os aspectos nutricionais na formação de mudas com qualidade; desta forma, objetivou-se avaliar doses de nitrogênio (N) no desenvolvimento de mudas altas de maracujá amarelo. O delineamento experimental foi em blocos casualizados, com cinco tratamentos e cinco repetições. Os tratamentos foram compostos por doses de nitrogênio (0, 0,17, 0,34, 0,51 e 0,68 g L -1 ) na forma de nitrato de cálcio, aplicadas em forma de solução nutritiva. As doses 0,34, 0,51 e 0,68 g L -1 N aumentaram o teor de N nas folhas, proporcionando maior desenvolvimento em altura, diâmetro do caule e área foliar. A dose de 0,34 g L -1 N pode ser indicada na produção de mudas altas, visto que alcançou altura, diâmetro, índice de cor verde e formação de área foliar muito próximos à máxima dose de 0,68 g L -1 N e médias superiores à dose de 0,51 g L -1 N, contudo, estudos em campo são necessários para validação. As concentrações (g kg -1 ) nas folhas com a dose de 0,34 g L -1 N foram: N (21), P (0,86), Mg (2,58) e B (29,6). Estes valores estão adequados para mudas altas, confirmados pelos índices observados.Palavras-chave: Passiflora edulis; nutrição mineral; índice de cor verde. ABSTRACTDue to Cowpea aphid-borne mosaic virus dissemination, therefore it is necessary to produce larger and more vigorous seedlings and, currently, there is a lack of information about the nutritional aspects in the formation of these seedlings with quality. This study aimed to evaluate the nitrogen doses (N) applied on side-dressing on development of tall seedlings of yellow passion-fruit. The experimental design was a randomized block, with five treatments and five replications. The treatments consisted of five N levels (0; 0.17; 0.34; 0.51 and 0.68 g L -1 ) as calcium nitrate, applied on side-dressing in the form of nutrient solution, weekly until 90 days after emergence. Nitrogen rates from 0.34, 0.51 and 0.68 g L -1 increased the N content in the leaves, providing further development in height, stem diameter and leaf area. The rate of 0.34 g L -1 of N may be indicated in the tall seedlings production, because reached height, diameter, green index, and leaf area formation very close to the maximum rate of 0.68 g L -1 N and average higher the rate of 0.51 g L -1 N, however, field studies are needed to validate. The concentrations (g kg -1 ) in leaves at a rate of 0.34 g L -1 of N were: N (21), P (0.86), Mg (2.58), B (29.6), these values are suitable for tall seedlings confirmed by the observed rates.
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