TCC - Engenharia Florestal (Sede)
URI permanente para esta coleçãohttps://arandu.ufrpe.br/handle/123456789/436
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Resultados da Pesquisa
Item Fertilização potássica no crescimento de mudas de Eucalyptus camaldulensis Dehnh. sob limitação hídrica(2024-03-04) Luna, Andressa Cristina de; Freitas, Eliane Cristina Sampaio de; http://lattes.cnpq.br/7525975084334972; http://lattes.cnpq.br/8800788371861007The objective of this study was to evaluate the effect of potassium fertilization on the growth of Eucalyptus camaldulensis Dehnh seedlings under water limitation. The sowing was done with improved seeds of E. camaldulensis Dehnh in 80 tubes of 55 cm³ each. The seedlings were grown in full sunlight, and topdressing fertilization with macro and micronutrients, along with different doses of potassium (K), using potassium chloride (KCl) as a source, was applied. After the potassium fertilization was completed, measurements of height (H) and collar diameter (CD) were taken to standardize the seedlings according to each treatment (K dose), and they were transplanted into 5 dm³ capacity pots filled with a substrate composed of 70 % subsurface soil and 30 % commercial substrate. The treatments consisted of a factorial of two irrigation regimes (with and without suspension) by five levels of topdressing fertilization with K (0, 75, 150, 225, and 300 mg dm - ³), arranged in a completely randomized design with 4 repetitions, each pot composing a sample unit. After 15 days of transplantation, irrigation was suspended in half of the pots for 21 days, and the number of leaves (NL) was counted, along with recording visual symptoms of water stress during this period. At the end of the experiment, new measurements of height (H), collar diameter (CD), shoot dry matter (NL) were taken, growth increments were calculated, and stomatal density, chlorophyll index, relative water content, and dry matter were determined. Using the data of height (H), collar diameter (CD), shoot dry matter (SDM), root (RDM), and total (TDM), seedling quality ratios were calculated: SDM/RDM, H/CD, and Dickson Quality Index (DQI). The data were analyzed using analysis of variance (p<0.05), and those indicating significant interaction were subjected to regression analysis within the qualitative factor. Analyzing the statistical data, it was observed that potassium fertilization positively influenced the initial growth of the seedlings in all treatments, with the estimated optimum dose being 286 Kg dm -3 of K. The result of the variables with the factors of K doses and irrigation of Eucalyptus camaldulensis Dehnh seedlings showed a significant difference of 5% only for irrigation.Item Memória hídrica (stress imprint) em sementes: impacto ecofisiológico na germinação e no crescimento inicial de Sesbania virgata (Cav.) Poir(2024-03-11) Menezes, Mariane Oliveira; Santos, Marcone Moreira; Silva, Carlos Luiz da; http://lattes.cnpq.br/9191002336120487; http://lattes.cnpq.br/3284707164193715; http://lattes.cnpq.br/1484285198376822The present study investigated the effects of hydraulic memory on the eco-physiological aspects of germination and the initial development of S. virgata seedlings. Employing a mixed-method approach that combined quantitative and qualitative methods, along with rigorous statistical analysis including tests such as Tukey, ANOVA, and regression analysis, a randomized experiment with various treatments was conducted. Initially, a literature review was conducted to understand the species' importance and the effects of hydraulic memory. Subsequently, laboratory tests were performed to overcome seed dormancy, determine moisture content, and establish the imbibition curve. Additionally, the germination rate of seeds subjected to polyethylene glycol 6000 (PEG 6000) solution was evaluated to simulate water stress, both with seeds that underwent intermittent hydration cycle (IHC) and those that did not undergo this process. Following laboratory analyses, nursery analyses were conducted with two distinct treatments (seeds subjected to IHC and seeds that did not undergo this process), under different watering regimes. Evaluated parameters included shoot height and diameter, root size, dry and fresh weight, Dickson's quality index, biomass allocation, and seedling survival rate. The results indicated the possible presence of hydraulic memory in the seedlings and demonstrated that water deficit negatively affects germination. However, intermittent hydration showed a positive effect on seed germination under water deficit conditions, offering a promising strategy to enhance plant survival in adverse environments.Item Restrição hídrica e fertilização fosfatada no crescimento de mudas de Tabebuia aurea (Silva Manso) Benth. & Hook.f ex S. Moore sob diferentes regimes de irrigação(2023-09-20) Pereira Neto, Cláudio Clementino; Freitas, Eliane Cristina Sampaio de; http://lattes.cnpq.br/7525975084334972; http://lattes.cnpq.br/5841590477669007The availability of water in the soil is one of the most important factors influencing the successful establishment of saplings in field conditions. The scarcity of this resource serves as a constraining element that hampers both productivity and the prosperous cultivation of forest crops. Implementing applications of phosphate fertilizer can play a pivotal role in fostering the development of a more robust root system, thereby potentially mitigating the adverse impacts stemming from inadequate water availability on the cultivation. Investigations dedicated to silviculture pertaining to native forest species remain relatively scarce, primarily due to a concentration of research efforts around commercially more prevalent species. With the aim of evaluating tolerance and growth, as well as morphophysiological alterations in seedlings of Tabebuia aurea (Silva Manso) Benth. & Hook.f ex S. Moore subjected to water deficit and phosphate fertilization; an experiment was conducted at the greenhouse of the Department of Forestry Science at UFRPE – SEDE. Three irrigation cycles: daily (T); every 5 days (S5); and every 10 days (S10), and 4 phosphorus addition treatments (0, 100, 200, and 300 mg dm-³ of P) were tested following a factorial scheme in a completely randomized design, with 5 replicates. The source of P employed was monosodium phosphate (NaH2PO4). Two seeds were placed per 50 cm³ tubes, and thinning was conducted post germination. Following germination and growth, seedlings were standardized based on height and transplanted into 2,8 dm³ pots containing subsoil substrate. Water deficit induction was conducet after transplantation and phosphorus treatments differenciation. Throughout the experiment, seedling measurements were taken every ten days, encompassing parameters such as height (H) and stem diameter (DC). At the conclusion of the trial, the following aspects were determined: shoot dry matter (MSA), root dry matter (MSR), total dry matter (MST), shoot-to-root dry matter ratio (MSA/MSR), and Dickson's Quality Index (IQD) were calculated. Additionally, H, DC, NF, leaf area, primary root length, and chlorophyll content were determined. The application of phosphorus doses did not act as a mitigating factor for the effects of water stress. Seedlings with better quality were obtained in the treatment with daily irrigation, and the dose that yielded the best responses for the production of T. aurea seedlings was 200 mg dm-3.