Produção de mudas de flamboyant em diferentes tipos de substratos

Abstract

Delonix regia, popularly known as flamboyant, is a plant widely used in afforestation and reforestation of squares, parks and streets in several cities in Brazil and the world. The appropriate substrate for seedlings is extremely important, as it is directly linked to germination, growth and development of seedlings, favoring or not their production in a short period of time with low costs and high quality. The burnt rice husk, in addition to being an easily purchased material, has characteristics that allow good drainage, aeration, influences air exchange at the base of the roots, and may be an alternative in the production of flamboyant seedlings. This study aimed to evaluate different substrate compositions for the production of flamboyant seedlings. The experiment was conducted at the Federal University of Pampa (UNIPAMPA) - Itaqui Campus. The experimental design adopted was completely randomized, with 11 treatments and 12 replications. The evaluated substrates were: T1- Burnt rice husk, T2- Burnt rice husk + Sand (2:1), T3- Burnt rice husk + Soil (2:1), T4- Burnt rice husk + Sand + Soil (1:1:1), T5- Sand, T6- Sand + burnt rice husks (2:1), T7- Sand + Soil (2:1), T8 – soil, T9- Soil + burnt rice husks (2 :1), T10- Soil + Sand (2:1) and T11- commercial substrate. At 70 days after sowing, the following parameters were evaluated in the seedlings produced: shoot height, root length, stem diameter, substrate resistance, shoot dry mass and root dry mass . The treatments T5 sand and T11 commercial substrate were the ones that presented the lowest results when compared with the other treatments. The seedlings produced in burnt rice husks + soil (2:1) showed the best results in all evaluated parameters. The use of rice husk mixed with the soil has promising potential in the production of flamboyant seedlings.