RESUMO A utilização de fertilizantes orgânicos pode contribuir para melhoria das propriedades químicas, físicas e biológicas do solo, com seu uso apresentando baixo impacto ambiental. O objetivo deste trabalho foi avaliar a produtividade e a qualidade do maracujá amarelo em sistema orgânico, combinado com irrigação e níveis de insumos. Utilizou-se delineamento experimental em blocos casualizados, disposto em esquema fatorial (3x2) com quatro repetições. Os fatores avaliados foram: três níveis de insumos (fertilizantes e defensivos alternativos), com presença e ausência de irrigação. A adubação constou da aplicação no plantio em: 5, 10 e 15 litros de composto por planta e 500, 1.000 e 1.500 g de calcário por planta, para os níveis de insumos 1, 2 e 3, respectivamente. A adubação de cobertura foi parcelada em duas vezes: 118, 235 e 353 g por planta de termofosfato e 59,1, 118,20 e 176,40 g por planta de sulfato de potássio, para os níveis 1, 2 e 3 de aplicação de insumos, respectivamente. Os defensivos alternativos foram pulverizados a cada 30, 15 e 7 dias para os níveis 1, 2 e 3, respectivamente. O número de frutos por planta e a produtividade aumentaram utilizando o nível 3 de insumo aliado à irrigação. O nível 2 e 3 de insumos, na ausência de irrigação aumentaram o teor de sólidos solúveis. A acidez titulável, ratio e frutos classificados como extra não diferiram significativamente entre os tratamentos estudados. Utilizando insumos nos níveis 1 e 2 e na ausência de irrigação, aumentou a porcentagem de frutos classificados como orgânicos. | ABSTRACT The use of organic fertilizers can improve the chemical, physical, and biological properties of the soil, with their use implying low environmental impact. This study aimed to evaluate the yield and quality of yellow passion fruit grown in an organic system associated with irrigation and input levels. A randomized complete block design in a 3x2 factorial arrangement with four replications was adopted. The factors evaluated were: three input levels (fertilizers and alternative pesticides) and the presence or absence of irrigation. Fertilization consisted of the application of 5, 10, and 15 liters of organic compost per plant and 500, 1,000, and 1,500 g of lime per plant, corresponding to input levels 1, 2, and 3, respectively. Topdressing fertilization was split into two applications, corresponding to 118, 235, and 353 g per plant of thermophosphate and 59.1, 118.20, and 176.40 g per plant of potassium sulfate for levels 1, 2, and 3 of input application, respectively. The alternative pesticides were sprayed every 30, 15, and 7 days for levels 1, 2, and 3, respectively. The number of fruits per plant and the yield increased using the input level 3 associated with irrigation. In the absence of irrigation, input levels 2 and 3 increased the content of soluble solids. The titratable acidity, TSS/TTA ratio, and the fruits classified as extra did not differ significantly between treatments. Input levels 1 and 2 associated with the absence of irrigation increased the percentage of fruits classified as commercial.

ABSTRACT Yellow passion fruit is a fruit species widely cultivated throughout the Brazilian semi-arid territory, but its yield is affected by the quality of the waters of this region. In this context, the objective was to evaluate the gas exchange and production of passion fruit cv. BRS Rubi do Cerrado irrigated with waters of different cationic natures. The study was conducted in drainage lysimeters under greenhouse conditions in Campina Grande, PB, Brazil, in a randomized block design, and the treatments were eight cationic natures of irrigation water (S1 - Control; S2 - Na+; S3 - Ca2+; S4 - Mg2+; S5 - Na+ + Ca2+; S6 - Na+ + Mg2+; S7 - Ca2+ + Mg2+ and S8 - Na+ + Ca2+ + Mg2+) with three replicates. Plants in the control treatment were irrigated with water of low electrical conductivity (ECw = 0.4 dS m-1), while those of the other treatments were irrigated using water with ECw of 3.5 dS m-1. The treatments Na+ + Ca2+, Na+ + Mg2+ and Ca2+ + Mg2+ were prepared in the equivalent ratio of 1:1, and Na++Ca2++Mg2+ in the ratio 7:2:1, respectively. Water salinity of 3.5 dS m-1 reduced gas exchange, and stomatal conductance and transpiration were the most sensitive variables of passion fruit. The number of fruits of passion fruit cv. BRS Rubi do Cerrado decreased with water salinity, regardless of the cationic nature. The waters of calcic and calcic+magnesian nature caused the greatest deleterious effects on the production variables of passion fruit, at 259 days after transplanting.