Produção de mudas de maracujazeiro sob influência de biomassa de microalgas via radicular.

Abstract

The production of seedlings constitutes one of the most important stages of the productive system, directly influencing the performance of the plant. The objective of this study was to establish the technology for the use of Spirulina platensis and Scenedesmus sp by determining the best concentration for the production of yellow passion fruit seedlings. The experiment was carried out in a completely randomized block design in a 2x5 factorial, whose treatments were constituted by different concentrations of biomass of Spirulina platensis and Scenedesmus sp, where: T1: 0,0% control; T2: 0.2%; T3: 0.4%; T4: 0.8%; and T5: 1%, with four blocks and two replicates per block. The microalgae were weighed in a similar analytical balance, later diluted in tap water with constant agitation and applied 100 ml of the solution per plant every seven days totaling five applications. At 60 days, the number of leaves, total seed length, stem diameter, root length, shoot length, fresh shoot weight, fresh root mass, shoot dry mass, root system and total chlorophyll. Spirulina platensis presented superiority compared to Scenedesmus sp. For the variables stem diameter, shoot length, fresh shoot mass, fresh mass of the root system, dry shoot mass and dry mass of the root system. The doses influenced significantly the number of leaves, fresh mass of the root system, dry mass of the root system, shoot length and fresh shoot mass. The best dose of seaweed applied was 0.8% in passion fruit seedlings at 60 days.