Differential behavior of young eucalyptus clones in response to nitrogen supply

• Autor(a) principal: Novais, Roberto Ferreira
• Data de Publicação: 2015
• Outros Autores: Ferreira, Eric Victor de Oliveira, Pereira, Greice Leal, Barros, Nairam Félix de, Silva, Ivo Ribeiro da
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://dx.doi.org/10.1590/01000683rbcs20140560; http://www.locus.ufv.br/handle/123456789/14674
• topic: Gas exchange; Growth; Nutrient solution; Nutritional efficiency

Eucalyptus requires large amounts of nitrogen (N); however, it responds in diverse manners to the application of this nutrient. The aim of this study was to evaluate the differential performance in growth, mineral nutrition, and gas exchanges of N-fertilized Eucalyptus clones. The treatments consisted of two Eucalyptus clones (VM-01 and I-144) and six N application rates (0, 0.74, 2.93, 4.39, 5.85, and 8 mmol L^-1 NH4NO3) arranged in a randomized complete block design with five replications. VM-01 had greater plant height and greater height/collar diameter ratio, as well as higher leaf concentrations of all macronutrients and of Cu, Fe, Mo, and Zn. In terms of total and root dry matter production, root/shoot ratio, and collar diameter, as well as stomatal conductance and transpiration, I-144 performed better. The performance of the clones was clearly differentiated, and the growth of I-144, despite lower leaf N concentration, was in general better than VM-01.