Efficiency of organomineral fertilizer and doses of Azospirillum brasilense on the morphophysiological quality of Mezilaurus itauba seedlings

Eficiência de fertilizante organomineral de resíduos de cupuaçuzeiro e doses de Azospirillum brasilense na qualidade morfofisiológica em mudas de Mezilaurus itauba

Abstract

The present study was conducted to determine the efficiency of organomineral fertilizer from cupuaçu residues (ORFCup) and dose of maximum technical efficiency of Azospirillum brasilense on the initial growth and morphophysiological quality of Mezilaurus itauba seedlings in the northern Amazon. The variables evaluated were: shoot height (H, cm), stem diameter (SD, mm), shoot dry mass (SDM, g plant^-1), root dry mass (RDM, g plant^-1) total dry mass (TDM, g plant^-1), Dickson quality index (DQI), net assimilation rate (NAR, g m^-2 day^-1), leaf relative growth rate (RGR, g m^-2 day^-1), leaf area ratio (LAR, m² g^-1), leaf relative growth rate (RGR, g m^-2 day^-1), leaf area ratio (LAR, m² g^-1), specific leaf area (SLA, cm² g^-1), and leaf mass ratio (LMR, g g^-1). Organomineral fertilizer from cupuaçu residues promotes better quality and robustness in M. itauba seedlings at the dose of maximum technical efficiency of 0.45 mL. L^-1 of A. brasilense.

Keywords:
Itaúba; specific leaf area; net assimilation rate; Dickson quality index; N-fixing bacteria