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. ORFCup (ORFCup Amazon were H, H (H cm, cm , cm) SD, SD (SD mm, mm mm) SDM, SDM (SDM plant1, plant1 plant 1 RDM, RDM (RDM plant-1 TDM, TDM (TDM DQI, DQI (DQI) NAR, NAR (NAR m 2 m- day1, day1 day day-1) RGR, RGR (RGR LAR, LAR (LAR g1, g1 g-1) SLA, SLA (SLA LMR, LMR (LMR g1. . M 045 0 45 0.4 mL L1 L L- A plant- (DQI day-1 g-1 04 4 0. day- g-
Resumo O presente estudo foi realizado com o objetivo de determinar a eficiência de fertilizante organomineral de resíduos de cupuaçuzeiro e a dose de máxima eficiência técnica de Azospirillum brasilense sobre o crescimento inicial e qualidade morfofisiológica em mudas de Mezilaurus itauba na Amazônia setentrional. As variáveis avaliadas foram: comprimento da parte aérea (H, cm), diâmetro do colo (DC, mm), massa seca da parte aérea (MSPA, g plant-1), massa seca das raízes (MSR, g plant-1) e massa seca total (MST, g plant-1), e índice de qualidade de Dickson (IQD), taxa de assimilação líquida (EA, g.m-2.dia), taxa de crescimento relativo foliar (RA, g.m-2.dia); razão de área foliar (FA, m2.g-1), área foliar específica (SA, cm2.g-1), razão da massa foliar (Fw, g/g-1). O fertilizante organomineral de resíduos de cupuaçuzeiro (FORCup) promove melhor qualidade e robustez nas mudas de Mezilaurus itauba em conjunto com a aplicação de 0.45 mL. L-1 de Azospirillum brasilense. setentrional foram H, H (H cm, cm , cm) DC, DC (DC mm, mm mm) MSPA, MSPA (MSPA plant1, plant1 plant 1 MSR, MSR (MSR plant-1 MST, MST (MST IQD, IQD (IQD) EA, EA (EA g.m2.dia, gm2dia gmdia g.m 2.dia m 2 dia g.m-2.dia) RA, RA (RA g.m2.dia FA, FA (FA m2.g1, m2g1 mg m2.g m2 m2.g-1) SA, SA (SA cm2.g1, cm2g1 cmg cm2.g cm2 cm2.g-1) Fw, Fw (Fw g/g1. gg1 gg g/g . g/g-1) FORCup (FORCup 045 0 45 0.4 mL L1 L L- plant- (IQD gm 2dia g.m-2.dia g1 m2.g1 m2g m2.g-1 cm2.g1 cm2g cm2.g-1 g/g1 g/g-1 04 4 0. m2.g- cm2.g- g/g-