Banca de QUALIFICAÇÃO: VANESSA MELO DE FREITAS

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : VANESSA MELO DE FREITAS
DATE: 28/11/2024
TIME: 14:00
LOCAL: online
TITLE:

CIRCULAR ECONOMY IN THE PRODUCTION OF AÇAÍ SEEDLINGS: MIXTURE OF ROCK POWDER, BIOCHAR, AND MICROBIAL INOCULANT

KEY WORDS:

soil remineralization; soil fertility; nutrient availability; Brazilian Amazon.

PAGES: 30
BIG AREA: Ciências Agrárias
AREA: Agronomia
SUBÁREA: Ciência do Solo
SPECIALTY: Fertilidade do Solo e Adubação
SUMMARY:

The circular economy must be stimulated to strengthen the sustainability of human activities in the Amazon. The association between rock dust, biochar, and microorganisms can promote the improvement of soil quality for the cultivation of plants such as the açaí palm, which requires studies to evaluate the potential of this combination. The objectives of this study were to: i) characterize the metabasalt dust produced in the Carajás Mineral Province; ii) understand the changes in the chemical attributes of low-fertility soil with the application of rock dust, biochar, and microbial inoculant; and iii) evaluate the growth of açaí palm seedlings in soils subjected to the application of these treatments. For this purpose, fragments of metabasalt rock were collected, crushed, sieved (0.3 mm) and characterized according to abrasion pH and nutrient contents. Biochar was produced from the pyrolysis of açaí seeds (400 °C) collected in the metropolitan region of Belém, Pará. The inoculant solution was composed mainly of bacteria of the genera Amycolatopsis sp., Oceanobacillus sp., and Bacillus sp., which have proven potential in nutrient solubilization. The experiment had eight treatments: T1 - soil; T2 - soil + rock dust (10%); T3 - soil + biochar (2%); T4 - soil + inoculant; T5 - soil + biochar (2%) + inoculant; T6 - soil + rock dust (10%) + biochar (2%); T7 - soil + rock dust (10%) + inoculant; and T8 - soil + rock dust (10%) + biochar (2%) + inoculant, which were conducted for 120 days in a greenhouse. After that, the plants were evaluated in terms of growth, nutrient content in the plant tissue, and photosynthetic rate (A), and the substrates were evaluated in terms of fertility. Data with normal distribution were compared using analysis of variance (ANOVA) and Scott-Knott test (p < 0.05), and data without normal distribution were compared by Kruskal-Wallis and Dunn tests (p < 0.05). The rock dust presented several nutrients in content above that required by Brazilian legislation, including bases (Ca, Mg, and K) and micronutrients such as Fe and Mn. The results of the experiment indicated significant changes in soil fertility with the application of the treatments, especially with rock dust (T2, T6, T7, and T8), which considerably increased the pH, sum of bases, and base saturation. The plant biometry variables showed trends of better results with the application of T3, T4, T5, and T8. Several treatments promoted higher nutrient levels in plant tissue compared to natural soil, indicating the potential of these materials as a source of essential elements. The results of this study could support the use of mining byproducts and agro-industrial waste to improve soil fertility in the Amazon, favoring the circular economy in the region.

COMMITTEE MEMBERS:
Presidente - ***.493.086-** - SILVIO JUNIO RAMOS - ITV
Externo à Instituição - GABRIEL CAIXETA MARTINS - ITV
Externo à Instituição - JEFFERSON SANTANA DA SILVA CARNEIRO - NetZero