Crescimento, características nutricionais e fisiológicas de progênies de Eucalyptus grandis W. Hill. Ex Maiden sob diferentes doses de fósforo

• Ano de defesa: 2015
• Autor(a) principal: Fernandes, Jansen Barrozo [UNESP]
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual Paulista (Unesp)
• Palavras-chave em Português: Eucalipto; Adubação; Fertilizantes fosfatados; Florestas; Plantas - Nutrição; Phosphorus
• Link de acesso: http://hdl.handle.net/11449/136052; http://www.athena.biblioteca.unesp.br/exlibris/bd/cathedra/15-02-2016/000858246.pdf

The crop of Eucalyptus species in Brazil makes up an important sector of the Brazilian economy and covers wide variety of environments with different production potential. In these environments, forest productivity is governed mostly by the flow of water and nutrients in the ecosystem, and phosphorus (P) is the mineral element more that more limited forest productivity. The selection of genetic materials with greater efficiency in the uptake, translocation and use of the element can contribute to increased crop yields and contribute positively to the sustainability of agricultural production in these environments. In this context, this study aimed to characterize the growth, mass production, nutritional and physiological characteristics of four Eucalyptus grandis progenies subject to six different doses of phosphorus fertilization, in pots conditions. The experimental design was a randomized complete block in a factorial 4 x 6 (4 progenies of E. grandis and 6 doses of P: 0, 75, 150, 225, 300 and 375 mg dm-3 P2O5), with 5 repetitions of two plants each. Data were subjected to analysis of variance with mean comparison between progenies and polynomial regression analysis for P2O5 doses. The progenies responded differently to P2O5 doses, according to the characteristics evaluated. Doses greater than 225 mg dm-3 P2O5 not provide gains in growth and accumulation of biomass. The efficiency of acquisition of the progenies generally increased with increasing doses, while the utilization efficiency decreased. The net assimilation rates and stomatal conductance have not changed according to different doses of P. The higher doses of P do not negatively impact the nitrogen uptake