Efeito do biocarvão no desenvolvimento de mudas do maracujazeiro amarelo

Abstract

Biocarbon is an alternative for seedling production due to its substrate-favorable characteristics, such as: porosity increase, aeration and water retention capacity.The objective of the present study was to evaluate the growth of yellow passion fruit seedlings in substrates composed of the soil: biochar in different proportions with addition of mineral and organic N sources. The experiment was conducted in a greenhouse of Embrapa Mandioca and Fruticultura, in Cruz das Almas, BA. The experimental design was completely randomized, in a factorial scheme with four replications. The treatments consisted of six doses of BC (0, 10, 20, 40, 60 and 100%) and three sources of N (organic N, N mineral and without N). The experiment was conducted in a greenhouse of Embrapa Cassava and Fruticultura, in Cruz das Almas, BA. The experimental design was completely randomized, in a factorial scheme with four replications. The treatments consisted of six doses of BC (0, 10, 20, 40, 60 and 100%) and three sources of N (organic N, N mineral and without N). The organic and mineral sources were avian litter and ammonium sulfate, respectively. The commercial substrate Vivatto Slim Plus® was considered as the control treatment. At 91 days the analysis of the morphological parameters: plant height (AP), stem diameter (DC), root dry mass (MSR), dry shoot mass (MSPA), total dry mass Dickson quality index (IQD). Most of the analyzed variables were significantly influenced by the addition of BC in the soil, but the viability of the use of BC as a substrate for the production of passion fruit seedlings depends on the complementation of a nitrogen source, being the aviary bed that best fit the BC producing seedlings similar to those produced under commercial substrate. Key words: Passion fruit; Dickson Quality Score; biochar.