Density management of Acacia mearnsii De Wild. seedlings inoculated with nitrogen-fixing bacteria
DOI:
https://doi.org/10.5902/1980509892888Keywords:
Biological nitrogen fixation, Bradyrhizobium japonicum, Seedling alternation, Seedling qualityAbstract
Acacia mearnsii is a forest species of significant economic importance, notably used in charcoal, pulp, and tannin production, as well as in silvopastoral systems. The Acacia genus naturally establishes symbiotic associations with atmospheric nitrogen-fixing bacteria which convert nitrogen into assimilable forms, substantially contributing to plant nutrition. This study aimed to evaluate the effects of Bradyrhizobium japonicum inoculation and seedling alternation on the quality of A. mearnsii seedlings in a nursery setting. Phase I of the study involved seedling production and foliar application of the inoculant 20 days after emergence. Phase II consisted of seedling acclimatization under different alternation levels. The experiment was conducted in a completely randomized design with two factors: Factor A – with and without B. japonicum inoculation, and Factor B – seedling alternation at 25% and 50%, totaling four treatments with three replicates. Morphophysiological evaluations of the seedlings were performed at 150 days. The 25% alternation promoted greater stem diameter growth and biomass accumulation in the seedlings. The Dickson Quality Index was also higher at this alternation level, regardless of B. japonicum inoculation, which may be associated with the presence of nitrogen fertilization in the substrate and the final stage of seedling production, characterized by thermal restriction.
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