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Acta Amazonica

Print version ISSN 0044-5967On-line version ISSN 1809-4392

Acta Amaz. vol.25 no.3-4 Manaus  1995

http://dx.doi.org/10.1590/1809-43921995253170 

AGRONOMIA

CONTRIBUIÇÃO AO CONHECIMENTO DO SISTEMA RADICULAR DA PUPUNHEIRA (Bactris gasipaes KUNTH, PALMAE). II. SOLO LATOSSOLO AMARELO, TEXTURA ARGILOSA

Contribution to the Knowledge of Root System of the Pejibaye (Bactris gasipaes Kunth, Palmae). II. Yellow Oxisol, Clay Texture

Sidney A. do Ν FERREIRA 1  

Charles R CLEMENT 1  

Guido RANZANI 2  

Suely de S COSTA 1  

1Coordenadoria de Pesquisas em Ciências Agronômicas, Instituto Nacional de Pesquisas da Amazônia - IΝΡΑ, Cx. Postal 478, 69011 Manaus, AM, Brasil.

2 Rua Prudente de Morais, 1941, Apto. 83, 13416-720 Piracicaba, SP, Brasil

RESUMO

A distribuição da biomassa e da área absorvente do sistema radicular da pupunheira (Bactris gasipaes) foram estudadas num latossolo amarelo, textura argilosa, perto de Manaus, Amazonas, Brasil. Aproximadamente 80% da biomassa se encontrava no horizonte Ap, da qual 90% se encontrava dentro da área de projeção da copa. A biomassa total estimada pesou 72 kg, excluindo-se a massa logo abaixo do estipe. A área superficial das raízes aumentou significativamente conforme se afastava do estipe, devido a proporção cada vez maior de raízes terciárias e quartenárias, embora sua abundância por m3 diminuiu de forma similar à biomassa. A área superficial total estimada chegou a 545 m2, da qual se supõe que 50% é ativa na absorção de nutrientes. Supõe-se ainda que existam raízes absorventes até 8-9 m do estipe das plantas. Recomenda-se que a adubação seja feita dentro e logo fora da projeção da copa.

Palavras-Chave: Pupunha; Bactris gasipaes; sistema radicular; biomassa; área das raizes absorvente

ABSTRACT

The distribution of the pejibaye's (Bactris gasipaes) root biomass and absorbtive area was studied in a clay textured, yellow Oxisol, near Manaus, Amazonas, Brazil. Approximately 80% of the biomass was found in the Ap horizon and 90% of this within the crown projection area. Total biomass was estimated at 72 kg, without, however, including the very large mass immediately below the stem. The root surface area increased significantly as distance from the stem increased, due to the increase in the proportion of third and fourth order roots, although its abundance per m3 diminished like that of the biomass. The total root surface area was estimated at 545 m2, of which 50% is probably active in nutrient absorbtion. The observed distribution suggested that there are absorbtive roots at least 8-9 m from the stem. Fertilizer placement should be within and just outside of the crown projection area.

Key words: Pejibaye; Bactris gasipaes; root system; biomass; root absorbtive area

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