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Revista Brasileira de Ciência do Solo

On-line version ISSN 1806-9657

Rev. Bras. Ciênc. Solo vol.23 no.2 Viçosa Apr./June 1999

http://dx.doi.org/10.1590/S0100-06831999000200006 

SEÇÃO II - QUÍMICA E MINERALOGIA DO SOLO

 

Frações de boro e índices de disponibilidade em solos do estado do Ceará(1)

 

Boron fractions and availability indices in soils of Ceará, Brazil

 

 

F. F. Ferreyra H.I; F. R. SilvaII

IProfessor Titular do Departamento de Ciências do Solo, Centro de Ciências Agrárias, Universidade Federal do Ceará (UFC). Caixa Postal 12.168, CEP 60021-970 Fortaleza (CE). Bolsista do CNPq
IIPesquisadora do Departamento de Ciências do Solo, Centro de Ciências Agrárias, UFC

 

 


RESUMO

Em 29 amostras superficiais (0-20 cm) de solos do estado do Ceará, foram determinadas diferentes frações de boro e estabelecidas relações com algumas propriedades do solo e com o boro solúvel, usado como índice de disponibilidade para as plantas. As frações de boro foram analisadas, seguindo-se um esquema de fracionamento seqüencial. Determinaram-se o boro solúvel em água (B-Sol), o boro não especificamente adsorvido (B-NEsAd), o boro especificamente adsorvido (B-EsAd), o boro associado a óxidos de Mn (B-OxMn), o boro associado a óxidos de Fe e Al amorfo (B-OxFeA) e a óxidos de Fe e Al cristalino (B-OxFeC), e o boro residual (B-Res). Também foram determinados o boro total (B-Total) e o solúvel em três extratores: água quente, HCl 0,05 mol L-1 e manitol 0,05 mol L-1 + CaCl2 0,01 mol L-1. O teor de boro total nos solos variou de 10,5 a 24,0 mg kg-1 (média de 14,4 mg kg-1). As frações B-Sol, B-NEsAd e B-EsAd apresentaram teores entre 0,05 e 0,79 mg kg-1, representando entre 0,3 a 4,4% do B-Total. Dentre os óxidos, houve predominância do B-OxFeC (média de 4,4 mg kg-1) com teores entre 1 a 2 vezes superiores aos de B-OxFeA (média de 2,72 mg kg-1). Na maioria dos solos, a fração predominante foi o B-Res (média de 6,22 mg kg-1), ocluso em minerais silicatados, com teores que variaram de 19,6 a 70,7% do B-Total. Os valores de B disponível, nos três extratores, correlacionaram-se de forma altamente significativa entre si e com as frações B-Sol, B-NEsAd e B-EsAd. A matéria orgânica e a argila foram as propriedades que se correlacionaram melhor com o B-Sol, B-NEsAd e B-EsAd.

Termos de indexação: boro disponível, propriedades do solo, micronutriente, fracioanmento.


SUMMARY

Different soil boron fractions were evaluated from 29 superficial (0-20 cm) soil samples in Ceará, Brazil. Relationships were established between soil fractions and soil properties and soluble boron, which has been used as an index of boron availability to the plants. Fractional boron analyses of the soils were carried out following a sequential procedure. The following determinations were carried out: the water soluble boron (B-Sol), the not specifically adsorbed boron (B-NEsAd), the boron associated to manganese oxide (B-OxMn), the boron associated to Fe and Al amorphous oxides (B-OxFeA), the boron associated to Fe and Al crystalline oxides (B-OxFeC) and the residual boron (B-Res). The total boron (B-Total) was assessed as well as the available boron by means of three extractors: hot water (B-H2Oq), 0.05 mol L-1 hydrochloric acid (B-HCl) and 0.05 mol L-1 mannitol+ 0.01 mol L-1 CaCl2 (B-Man). B-Sol, B-NEsAd and EsAd have exhibited amounts ranging from 0.05 to 0.79 mg kg-1, which represents 0.3 to 4.43% of the B-Total. Among the oxides there was a predominance of B-OxFeC with fractions 1 to 2 times higher than those of B-OxFeA. In all soil samples, the B-Res (occluded in silicate minerals) was the predominant fraction, with amounts ranging from 19.6 to 70.7% of the B-Total. The available B, values removed by the three extractors, were highly correlated among themselves and with B-H2O, B-NEsAd and B-EsAd fractions. Clay and organic matter were the properties which best correlated with the B-Sol, B-NEsAd and B-EsAd.

Index terms: available boron, soil properties, micronutrient, fractionation.


 

 

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Recebido para publicação em julho de 1997
Aprovado em dezembro de 1998

 

 

(1) Trabalho financiado pelo CNPq.

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