Nível crítico de boro em cenoura cultivada em um solo sob cerrado

Realizou-se em campo um experimento em um Latossolo Vermelho, distrófico argiloso, sob regime isohipertérmico, para avaliar a resposta da cenoura (Daucus carota) cv. Alvorada à adubação com boro. O delineamento experimental consistiu de blocos casualizados com seis tratamentos (0; 1,7; 3,4; 5,1; 6,8...

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Published inHorticultura brasileira Vol. 23; no. 1; pp. 68 - 71
Main Authors Mesquita Filho, Manoel Vicente de, Souza, Antonio Francisco, Silva, Henoque R. da
Format Magazine Article
LanguageEnglish
Published 01.03.2005
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Abstract Realizou-se em campo um experimento em um Latossolo Vermelho, distrófico argiloso, sob regime isohipertérmico, para avaliar a resposta da cenoura (Daucus carota) cv. Alvorada à adubação com boro. O delineamento experimental consistiu de blocos casualizados com seis tratamentos (0; 1,7; 3,4; 5,1; 6,8 e 10,2 kg B ha-1) com quatro repetições. O extrator utilizado para a determinação de boro no solo e na matéria seca das folhas foi a Azometina-H. A produção máxima de raízes comercializáveis de cenoura foi de 50,6 t ha-1, obtida com o teor estimado de 0,55 mg kg-1 de boro no solo. O nível crítico de boro no solo, associado a 90% da produção máxima comercializável estimada de cenoura foi de 0,45 mg kg-1. Numa primeira aproximação, os níveis de B (mg kg-1) no solo foram assim classificados: baixo (<0,30); médio (0,31-0,44), adequado (0,45-0,55) e alto (>0,55 mg kg-1 B), e para efeito de diagnose foliar com base nos teores na matéria seca das folhas em: baixo (<24,1), médio (2534,9), adequado (3551,9) e alto (>51,9 mg B kg-1). A field experiment was carried out on a clayey Dystrophic Red Latosol (Oxisol), under isohyperthermic regime to evaluate the effect of boron application on carrot root yield (Daucus carota) cv. Alvorada. A factorial scheme layout with six treatments (0; 1.7; 3.4; 5.1; 6.8; and 10.2 kg B ha-1) was arranged in a randomized complete block design with three replications. Azomethine-H was used as extractant for boron determination in soil and plant material. The maximum marketable root yield was 50.6 t ha-1, obtained under the estimated concentration of 0.55 mg B kg-1 in the soil. The critical boron (B) concentration in the soil associated with 90% of the maximum marketable root yield was 0.45 mg kg-1. As a first approximate, the levels of B in the soil could be classified as low (<0.30), medium (0.31-0.44), adequate (0.45-0.55) and high (>0.55 mg B kg-1). The B levels in the leaves (on a dry weight basis) were classified accordingly to the following ranges: low (<24.1), medium (2534,9), adequate (3551.9) and high (>51.9 mg kg-1 B).
AbstractList Realizou-se em campo um experimento em um Latossolo Vermelho, distrófico argiloso, sob regime isohipertérmico, para avaliar a resposta da cenoura (Daucus carota) cv. Alvorada à adubação com boro. O delineamento experimental consistiu de blocos casualizados com seis tratamentos (0; 1,7; 3,4; 5,1; 6,8 e 10,2 kg B ha-1) com quatro repetições. O extrator utilizado para a determinação de boro no solo e na matéria seca das folhas foi a Azometina-H. A produção máxima de raízes comercializáveis de cenoura foi de 50,6 t ha-1, obtida com o teor estimado de 0,55 mg kg-1 de boro no solo. O nível crítico de boro no solo, associado a 90% da produção máxima comercializável estimada de cenoura foi de 0,45 mg kg-1. Numa primeira aproximação, os níveis de B (mg kg-1) no solo foram assim classificados: baixo (<0,30); médio (0,31-0,44), adequado (0,45-0,55) e alto (>0,55 mg kg-1 B), e para efeito de diagnose foliar com base nos teores na matéria seca das folhas em: baixo (<24,1), médio (2534,9), adequado (3551,9) e alto (>51,9 mg B kg-1). A field experiment was carried out on a clayey Dystrophic Red Latosol (Oxisol), under isohyperthermic regime to evaluate the effect of boron application on carrot root yield (Daucus carota) cv. Alvorada. A factorial scheme layout with six treatments (0; 1.7; 3.4; 5.1; 6.8; and 10.2 kg B ha-1) was arranged in a randomized complete block design with three replications. Azomethine-H was used as extractant for boron determination in soil and plant material. The maximum marketable root yield was 50.6 t ha-1, obtained under the estimated concentration of 0.55 mg B kg-1 in the soil. The critical boron (B) concentration in the soil associated with 90% of the maximum marketable root yield was 0.45 mg kg-1. As a first approximate, the levels of B in the soil could be classified as low (<0.30), medium (0.31-0.44), adequate (0.45-0.55) and high (>0.55 mg B kg-1). The B levels in the leaves (on a dry weight basis) were classified accordingly to the following ranges: low (<24.1), medium (2534,9), adequate (3551.9) and high (>51.9 mg kg-1 B).
Author Silva, Henoque R. da
Mesquita Filho, Manoel Vicente de
Souza, Antonio Francisco
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GUPTA U.C. (ref13) 1972; 36
OLSON R.V. (ref21) 1946; 11
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Title Nível crítico de boro em cenoura cultivada em um solo sob cerrado
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