Produção de mudas do maracujazeiro amarelo (Passiflora edulis Sims f. flavicarpa Deg.) sob adubação organomineral.

Abstract

The exploration and cultivation of yellow passion fruit has a wide adaptation and cultivation in Brazil, necessitating cultivation practices that improve its development system starting with the production of seedlings, where it can be influenced by different factors necessary for the development of plants. The objective of this study was to study the formation of passion fruit seedlings under organomineral fertilization on two substrates. The experiment was carried out in a protected environment (greenhouse) in the municipality of Pombal, Paraíba, from February to April, 2018. Using a randomized block design with twelve treatments, composed by fertilizer with biofertilizer considering the recommended nitrogen dose, mineral fertilization using NPK, both applied through soil, and two different substrates: 25% of manure and 75% of sandy loam soil, 50% manure and 50% franco-sandy soil. The treatments consisted of doses of biofertilizer: T1 = control (without fertilization); T2 = 60% (171.4 ml); T3 = 80% (228.5 ml); T4 = 100% (285.7 ml); T5 = 120% (342.8 ml) of the recommended dose of nitrogen; T6 = mineral fertilization with NPK, both containing 25% bovine manure in the substrate composition; T7 = control (without fertilization); T8 = 60% (171.4 ml); T9 = 80% (228.5 ml); T10 = 100% (285.7 ml); T11 = 120% (342.8 ml) of the recommended dose of nitrogen; T12 = mineral fertilization with NPK, both containing 50% bovine manure in the substrate composition. With four replications, totaling 48 plots. The seedlings were transported in polyethylene bags with a capacity of 1.5 L for 63 days after sowing, when they were evaluated for growth and dry matter accumulation. The application of 60 and 80% of the nitrogen recommendation with biofertilizer in passion fruit seedlings cultivated with 50 and 25% of bovine manure favored the stem diameter and the accumulation of fresh mass of the aerial part until 42 and 63 days after sowing, respectively. Fertilization with mineral N in soils with 25% bovine manure favored only fresh shoot mass in yellow passion fruit seedlings until 63 DAS.