Banca de DEFESA: PEDRO HENRIQUE OLIVEIRA SIMOES

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : PEDRO HENRIQUE OLIVEIRA SIMOES
DATE: 30/08/2021
TIME: 10:00
LOCAL: meet.google.com
TITLE:

GROWTH, PHYSIOLOGICAL RESPONSES, EFFICIENCY OF WATER USE AND NUTRIENTS IN Tachigali vulgaris L. G. & C. C. Lima PLANT POTASSIUM FERTILIZED, IGARAPÉ-AÇU - PA.

KEY WORDS:

Photosynthetic rates; phenotypic plasticity; forest species.

PAGES: 123
BIG AREA: Ciências Agrárias
AREA: Recursos Florestais e Engenharia Florestal
SUBÁREA: Silvicultura
SPECIALTY: Nutrição Florestal
SUMMARY:

The use of native forest species, either for wood production or for recovery of degraded areas, is further hampered by the lack of information on their nutritional requirements for the establishment and development of plants in the field. The absence of soil vegetation cover, besides implying less accumulation of organic matter, favors the increase in temperature due to direct exposure to light energy, reducing water retention capacity, which affects leaf water potential, nutritional status. and leaf gas exchange. Adequate nutrient supply, such as phosphorus (P) and potassium (K), may favor different plant growth mechanisms, such as photosynthetic performance, effectively contributing to the establishment of plants in the field, as it acts in the expression of phenotypic plasticity in relation to tolerance of plants to limited conditions of primary resources (water, light and nutrients), contributing to incorporate degraded areas into production processes. Tachigali vulgaris L. G. Silva & C. Lima is a pioneer species that often initiates secondary succession in open areas and is considered ideal for reforestation due to its high biomass production capacity, rapid growth in adverse conditions and high resistance to environmental disturbances. Its wood produced has similar characteristics to eucalyptus wood, in terms of calorific value and weight and volume yield in the carbonization process, bringing together promising characteristics for energy crops in the Brazilian Amazon and bordering regions. In this context, the present study aimed to evaluate the response to fertilization with different levels of phosphorus and potassium on growth, water and nutrient use efficiency and gas exchange in young Tachigali vulgaris planting in degraded soil. The experiment was installed in the municipality of Igararé-açu / PA and the treatments were established by applying three doses of P (0, 26.7 and 53.5 kg^-1 ha, as triple superphosphate) and three K rates (0, 50 and 100 kg^-1 ha, as potassium chloride), as well as their combinations, in a 3 x 3 factorial scheme and a randomized complete block design. The study was divided into two chapters, chapter 1 with the objective of evaluating the influence of fertilization with different levels of phosphorus and potassium on growth, water and nutrient use efficiency in young Tachigali vulgaris cultivated in degraded soil. The parameters of soil fertility, growth and efficiency of water and nutrient use will be evaluated. The results are expected to detail the behavior of Tachigali vulgaris species cultivated in degraded area in response to fertilization with different levels of P and K and to define the best dose of phosphate fertilizer to improve water and nutrient use efficiency in the second. year after planting. In chapter 2, the objective was to evaluate the effect of increasing doses of P and K on gas exchange in young Tachigali vulgaris cultivated in degraded area. Spot measurements of gas exchange were performed in April 2018, between 9:00 am and 11:00 am, in the middle third of the treetops, with an Infrared gas analizer (IRGA). The experiment with nine treatments was installed in randomized blocks with four replications, totaling 36 plots. To assess the effect of treatments, data were first evaluated for normality and homogeneity of variance by Shapiro-Wilk and Bartlett tests, respectively. Subsequently, the treatment means were subjected to analysis of variance and comparisons of means by means of the Tukey test at 5% and Pearson's linear correlation test. Multivariate statistics was also used through factor analysis (FA) and principal component analysis (PCA). Tachigali vulgaris stocking responded positively to potassium fertilization in relation to the photosynthesis rate (A), resulting in an increase of approximately 30% compared to the control treatment (without fertilization). An antagonistic effect on A was observed with the combined application of the highest doses of P and K. Increasing doses of potassium fertilizer, up to the dose of 78.2 g kg^-1 of K, provided the highest averages of water use efficiency. Intrinsic water use efficiency when combined with 16.6 g kg^-1 P application. AF and ACP are tools that enable the initial reduction of 8 gas exchange variables to 2 main components (CP1: interpreted as “assimilation”). and carbon fixation in biomass by plants ”and CP2: responsible for“ gas exchange with the atmosphere, transpiration and maintenance of leaf temperature ”) that encompass these 8 variables analyzed.

BANKING MEMBERS:
Presidente - 4143218 - JOAO OLEGARIO PEREIRA DE CARVALHO
Interno - 2595267 - CANDIDO FERREIRA DE OLIVEIRA NETO
Externa ao Programa - 1740947 - DENMORA GOMES DE ARAUJO
Externo à Instituição - MANOEL TAVARES DE PAULA - UEPA
Externo à Instituição - RUY GUILHERME CORREIA - UEPA