INTERAÇÃO SALINIDADE, BIOFERTILIZANTE E ADUBAÇÃO POTÁSSICA NA FORMAÇÃO DE MUDAS DE MARACUJAZEIRO AMARELO

Abstract

The yellow passion fruit (Passiflora edulis f. Flavicarpa Deg) is the most important species of the genus Passiflora, known from north to south of Brazil due to its nutritional and medicinal properties. Based on scientific information, the yellow passion fruit is seen as a very sensitive culture to the effects of salinity. In this context, it was aimed to evaluate the effect of bovine biofertilizer in mitigating the effects of salinity of irrigation water and to evaluate the potassium fertilization during the emergence and the formation of yellow passion fruit seedlings. The study was conducted under greenhouse environment of the Soils Department and Rural Engineering, belonging to the Agrarian Sciences Center of the Federal University of Paraiba, located in Areia-PB. The treatments were distributed in randomized block design with four replications, arranged in a factorial 5 x 3 x 2, corresponding five levels of electrical conductivity of irrigation water (0,3; 1,0; 2,0; 3,0 and 4.0 dS m-1), three types of K fertilization (without potassium, potassium chloride and potassium sulfate) in soil with and without bovine biofertilizer applied in liquid form at 1:1 ratio (bio: water) and 10 % of the substrate volume, 24 hours before seeding. The variables analyzed were: electrical conductivity of the soil saturation extract, emergency speed index, plant height, stem diameter, number of leaves, leaf area, dry matter of shoot and root, leaf contents of chlorophyll a, b and total. The increase of the water salinity and bovine biofertlizer inhibited the biometric growth, biomass production and the leaf chlorophyll contents of yellow passion fruit.