Influência dos diferentes substratos no desenvolvimento inicial de mudas de maracujá amarelo (Passiflora edulis f. flavicarpa Deg.)

Abstract

Brazil is considered the world's largest producer of yellow passion fruit, in the search for quality seedlings, the choice of substrate is of great importance, as it serves as a basis for the growth and initial nutrition of plants. Thus, the present research aimed to evaluate which better concentration of substrates promotes greater initial development of seedlings of Passionflower edulis f. flavicarpa Deg. The experiment was conducted from May 31 to August 30, 2019 in a greenhouse at the Embrapa Tabuleiro Costeiro Unit, located at the Campus of Engineering and Agricultural Sciences – CECA/UFAL, Rio Largo –AL, where seven treatments were tested : T0 – 100% soil (control); T1 - soil + 10% sheep manure; T2 – soil + 20% sheep manure; T3 – soil + 33% sheep manure; T4 – soil + 10% coffee grounds; T5 – soil + 20% coffee grounds; T6 – soil + 33% coffee grounds, with five repetitions, totaling 35 polyethylene bags with a volume of three liters. The evaluated parameters were: number of leaves (NF), height (H), leaf area (AF), stem diameter (DC), root length (CR), leaf dry matter content (TMSF), stem (TMSC), root (TMSR) and total dry matter content (TMST). The experimental design used was completely randomized (DIC), for analysis of the quantitative data referring to the concentration of the compounds, a regression model was used, while for the qualitative data, which consists of differences between the parameters for the same concentration, but with the organic compound different, and submitted to Tukey's test, both p<0,05, using statistical program Sisvar 5.6. Graphs were constructed using Microsoft Excel. Contrary to expectations, seedlings produced with coffee grounds did not show gains in initial development. Regarding the substrate containing sheep manure, it was observed that its use in concentrations of 33% can impair its decomposition and consequently the availability of nutrients for the plants. The substrate containing coffee grounds proved to be unfeasible and that its use "in natura" acidifies the soil and should be better studied. Thus, it is recommended for the production of Passionflower edulis f.flavicarpa Deg. the use of sheep manure substrate at a concentration of 20%, considering that it presented higher values of NF, H, AF, CR and TMST