Substratos Orgânicos na Produção de Mudas de Maracujazeiro Amarelo (Passiflora edulis f. Deneger).

Abstract

The success of an orchard is correlated with the production of seedlings with good genetic quality and health, especially with regard to the longevity of the orchards. Therefore, the objective was to evaluate the production of yellow passion fruit seedlings grown in different organic substrates in the high sertão of Paraíba. The project was developed between March to June 2022 in an agricultural greenhouse in the experimental area of the State University of Paraíba, Campus IV, Catolé do Rocha-PB. The experimental design was completely randomized with 20 treatments and 5 replications, totaling 100 plots. The substrates were the different types of substrates: S1= 100% soil – control, S2= 50% soil and 50% cattle manure, S3= 50% soil and 50% goat manure, S4= 50% soil and 50% goat manure. earthworm, S5= 25% soil and 75% cattle manure, S6= 25% soil and 75% goat manure, S7= 25% soil and 75% earthworm humus, S8= 75% soil and 25% cattle manure, S9= 75 % soil and 25% goat manure, S10= 75% soil and 25% earthworm humus, S11= 50% soil, 25% cattle manure, 25% sand, S12= 50% soil, 25% goat manure, 25% sand, S13= 50% soil, 25% earthworm humus, 25% sand, S14= 25% soil, 25% sand, 50% cattle manure, S15= 25% soil, 25% sand, 50% goat manure, S16= 25% soil, 25% sand, 50% earthworm humus, S17= 50% soil and 50% sand, S18= 75% soil and 25% sand, S19= 25% soil and 75% sand and S20= 40% soil, 20 % cow manure, 20% goat manure and 20% earthworm humus. The soil used was Entisols (Fluvents), eutrophic not saline. On the day before harvesting the experiment, gas exchange evaluations (photosynthesis, stomatal conductance, transpiration) were carried out. and pH of the substrates. The data were submitted to the Shapiro-Wilk error normality test and Bartlett's variance homogeneity test, and later, the assumptions were met (p < 0.05). Thus, they were submitted to analysis of variance using the F test with at least 95% confidence and the treatment means were compared using the ScootKnott test, with a 5% error probability. The best yellow passion fruit seedlings were formed using the substrates S2= 50% soil and 50% cattle manure, S4= 50% soil and 50% earthworm humus, S12= 50% soil, 25% goat manure, 25% sand and S16 = 25% soil, 25% sand, 50% earthworm humus. The ideal proportion of goat manure to the composition of substrates for the production of yellow passion fruit is up to 25% by volume. The electrical conductivity of substrates greater than 2.5 dS m-1 reduced growth, production and gas exchange in passion fruit seedlings.