Seleção de substratos para a produção de mudas de maracujazeiro-amarelo em Roraima.

Abstract

The production of quality seedlings is influenced by several factors, the substrate being one of the most important for fruit species. Thus, the objective of this study was to evaluate and select alternative substrates for the production of yellow passion fruit seedlings in Roraima. The work was carried out in Boa Vista at the Federal University of Roraima. The substrates used were: soil, commercial compost OrganoAmazon®, vermicompost PuroHumus®, carbonized rice husk, natural rice husk and sawdust. The experimental design used was completely randomized, in a 2 × 18 factorial scheme, with two cultivars of yellow passion fruit (Golden Star and Imperial) and eighteen substrates prepared by mixing. The variables analyzed after 60 days were: shoot height (H), stem diameter (DC), root length (CR), number of leaves (NF), total dry matter (MST), shoot dry matter (MSA) , root dry matter (MSR) and seedling quality index. Substrates made with 50% PuroHumus®+ 50% Soil (S5) and 25% OrganoAmazon®+ 25%PuroHumus®+ 50% Soil (S12) favor the attainment of higher quality seedlings in the cultivar Golden Star. The substrates formulated with 25% PuroHumus®+ 25% sawdust + 50% Soil (S18), 50% PuroHumus®+ 50% Soil (S5) and 25% OrganoAmazon®+ 25% PuroHumus®+ 50% Soil ( S12) are indicated for the production of seedlings of the Imperial cultivar. The use of pure soil or mixed with rice husk (carbonized or in natura), sawdust or OrganoAmazon® is not recommended for the production of yellow passion fruit seedlings.