Formulação de substrato com diferentes doses de composto orgânico para formação de mudas de maracujazeiro amarelo

Abstract

The objective was to evaluate the influence of different doses of organic compost on the development of yellow passion fruit seedlings propagated by seeds. The experiment was conducted in a completely randomized design, with four treatments and three replications, totaling twelve experimental units. The treatments consisted of different substrates: S1 = 50% sand + 50% soil, S2 = 30% compost + 35% sand + 35% soil, S3 = 40% compost + 30% sand + 30% soil, and S4 = 50% compost + 25% sand + 25% soil. Sixty days after sowing, the following variables were analyzed: seedling height, stem diameter, root length, root volume, shoot dry mass, root dry mass, total dry mass, and Dickson’s Quality Index. The substrate composition significantly influenced the growth of yellow passion fruit seedlings. The control substrate showed the poorest performance. In contrast, substrates with 40% and 50% organic compost resulted in the highest values for plant height, stem diameter, root length and volume, shoot dry mass, root dry mass, and total dry mass. The Dickson Quality Index was similar among all substrates containing compost. Thus, the use of 30% to 50% compost is recommended to produce more vigorous and higher-quality seedlings.