Crescimento e absorção de nutrientes por mudas de maracujazeiro-amarelo em substratosorgânico e comercial e adubação nitrogenada

Abstract

The conventional method for producing seedlings in containers uses substrates prepared with additional fertilizers. Thus, a suitable formulation of the substrate can reduce the need for supplementary fertilization. The study was carried out with the aim to evaluate the growth and nutrient absorption by seedlings of yellow passion fruit inorganic commercial substrates with and without nitrogen fertilization. The factorial scheme 4 × 2 was used, with four substrates consisting of mixture of textile waste and soil in a ratio of 1:1 (v/v), textile waste and soil in the proportion 2:1 (v/v), earth and manure in the proportion 2:1 (v/v), and a commercial substrate Bioplant® and two levels of additional fertilizers, with and without nitrogen, distributed in a completely randomized design with four replications and 10 plants per plot. Evaluation of seedling size and nutrient content in dry mass was done at 50 days after emergence. Data were submitted to analysis of variance and comparison of means by the Scott-Knott grouping at 0.05 error probability. The substrate formulated with manure provided the formation of passion fruit seedlings with larger size and higher nutrient levels. The production of passion fruit seedlings can be made using substrates formulated with 25% manure, without the need for additional fertilizers. To use commercial substrate Bioplant® for the production of passion fruit seedlings the supplemental fertilization is necessary. The substrate formulation with the mixture of the textile industry, the proportion should be less than 50%, considering the contents of K to meet the nutritional demand of yellow passion fruit seedlings.