Teste de diferentes substratos na germinação de sementes e desenvolvimento de mudas de aroeira (Myracrodruon urundeuva) na área de influência da Usina Hidroelétrica de Estreito - MA

Abstract

The quality of the seedlings worked is one of the decisive factors for the successful implementation of any forestry project. For this, it is essential to use a good substrate that provides favorable conditions for plant nutrition and development. In this. In this sense, the objective of the present work was to test the influence of different substrates on the germination of aroeira seeds collected in the area of influence of the UHE (Estreito Hydroelectric Power Plant) in Estreito - MA and on the development of seedlings. Being used low cost materials to make these substrates. The experiment was conducted at the Cradle of Nature Forest Nursery, located in the city of Estreito - MA. A completely randomized design (DIC) with five treatments and five replications was used, each experimental unit consisting of 9 plants. Submitted to Tukey test at 5% level. The treatments tested were; T1 100% standard substrate; T2 90% standard substrate + 10% manure; T3 90% standard substrate + 10% rock phosphate; T4 80% standard substrate + 20% rock phosphate; T5 70% standard substrate + 10% manure + 20% rock phosphate. To analyze the effectiveness of the treatments, the morphological characteristics of shoot height (H), stem diameter (DC) and number of leaves (NF) were evaluated at 30, 60, 90, 120 and 150 days after planting. At 150 days, root length (CR), shoot dry mass (MSPA), root dry mass (MSR), total dry mass (MST) were also analyzed, and the shoot and root dry mass ratio (MSPA / MSR) and the Dickson Quality Score (IQD). Germination percentage and germination speed index were also observed. For these last two parameters, the treatment with the lowest statistical value was treatment T2. The T5 treatment consisted of: 70% standard substrate + 10% manure + 20% rock phosphate, which presented the best averages in relation to shoot height, stem diameter and Dickson quality index