Photosynthetica, 2009 (vol. 47), issue 4

Photosynthetica 2009, 47(4):616-620 | DOI: 10.1007/s11099-009-0088-2

Photosynthetic parameters of young Brazil nut (Bertholletia excelsa H. B.) plants subjected to fertilization in a degraded area in Central Amazonia

M. J. Ferreira1, J. F. C. Gonçalves1,*, J. B. S. Ferraz1
1 Instituto Nacional de Pesquisas da Amazônia (MCT-INPA), Coordenação de Pesquisas em Silvicultura Tropical, Manaus, Brazil

In an experimental site for reforestation of degraded area, three-year-old plants of Bertholletia excelsa Humb. & Bonpl. were subjected to different fertilization treatments: T0 = unfertilized control, T1 = green fertilization (branches and leaves) and T2 = chemical fertilization. Higher net photosynthetic rates (P N) were observed in T1 [13.2±1.0 μmol(CO2) m-2 s-1] compared to T2 [8.0±1.8 μmol(CO2) m-2 s-1] and T0 [4.8±1.3 μmol(CO2) m-2 s-1]. Stomatal conductance (g s), transpiration rate (E) and water use efficiency (WUE) of individuals of T1 and T2 did not differ significantly, however, they were by 88, 55 and 63%, respectively, higher in T1 than in the control. The mean values of variable fluorescence (Fv), performance index (P.I.) and total chlorophyll [Chl (a+b)] were higher in T1. Our results indicate that green fertilization improves photosynthetic structure and function in plants of B. excelsa in young phase.

Keywords: chlorophyll a fluorescence; chloroplast pigment contents; forest restoration; green fertilization; performance index; photosynthesis

Received: March 16, 2009; Accepted: December 17, 2009; Published: December 1, 2009Show citation

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Ferreira, M.J., Gonçalves, J.F.C., & Ferraz, J.B.S. (2009). Photosynthetic parameters of young Brazil nut (Bertholletia excelsa H. B.) plants subjected to fertilization in a degraded area in Central Amazonia. Photosynthetica, 47(4), 616-620. doi: 10.1007/s11099-009-0088-2.
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