Differential Behavior of Young Eucalyptus Clones in Response to Nitrogen Supply

Revista Brasileira de Ciência do Solo

Eric Victor De Oliveira Ferreira¹  Roberto Ferreira Novais¹  Greice Leal Pereira¹  Nairam Félix De Barros¹  Ivo Ribeiro Da Silva¹ 

关键词: gas exchange;    growth;    nutrient solution;    nutritional efficiency;    crescimento;    eficiência nutricional;    solução nutritiva;    trocas gasosas;   

DOI  :  10.1590/01000683rbcs20140560

来源: SciELO

【 摘 要 】

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.

【 授权许可】

CC BY   
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