Resistência à penetração em latossolos: valor limitante à produtividade de arroz de sequeiro
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Data
2004-12-01
Autores
Beutler, Amauri Nelson [UNESP]
Centurion, José Frederico [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Universidade Federal de Santa Maria (UFSM)
Resumo
Este trabalho objetivou avaliar o valor de resistência à penetração limitante à produtividade de arroz de sequeiro (Oryza sativa cv. IAC 165) no conteúdo de água retida, na tensão de 0,05 e 0,01 MPa. Foram utilizadas amostras de Latossolo Vermelho, textura média (LVd) e, Latossolo Vermelho, textura argilosa (LVef), coletadas na profundidade de 0,00-0,20m, passadas em peneira de 0,004m e compactados em camadas de 0,03m, em vasos de 0,20m de altura e 0,25m de diâmetro (0,00982m³). Os valores de resistência à penetração foram determinados com o penetrômetro de anel dinamométrico. Utilizou-se o delineamento inteiramente casualizado, em esquema fatorial 4 x 2, com três repetições. No conteúdo de água retida, na tensão de 0,01MPa, o valor de resistência do solo à penetração limitante à produtividade de grãos de arroz de sequeiro foi de 2,38 e 2,07MPa, respectivamente, para o LVd e LVef. No conteúdo de água retida na tensão de 0,05MPa foram obtidas maiores produções no menor valor de resistência à penetração. O arroz de sequeiro foi menos produtivo no conteúdo de água retida na tensão de 0,05MPa.
The objetive of this work was to evaluate the value of resistance to penetration limit to dry land rice yield (Oryza sativa cv. IAC 165) grown in soil with water content at tension of 0.05 and 0.01MPa. Soil was sampled at 0.00-0.20m depth in Haplustox, medium texture (LVd) and Eutrustox, clayey (LVef) and compacted in layers of 0.03m in pots of 0.20m height and 0.25m diameter (0.00982m³). The values of resistance to penetration were measured by dinamometric ring penetrometer. The experiment was complete randomized, in a 4 x 2 factorial, with 3 replications. For the water content at tension of 0.01MPa, the value of resistance to penetration limit to dry land rice yield was 2.38 and 2.07MPa, respectively, for LVd and LVef. Higher rice yield was obtained in smaller value of resistance to penetration in water content at tension of 0.05MPa. The dry land rice was less productive in soil with water content at tension of 0.05MPa.
The objetive of this work was to evaluate the value of resistance to penetration limit to dry land rice yield (Oryza sativa cv. IAC 165) grown in soil with water content at tension of 0.05 and 0.01MPa. Soil was sampled at 0.00-0.20m depth in Haplustox, medium texture (LVd) and Eutrustox, clayey (LVef) and compacted in layers of 0.03m in pots of 0.20m height and 0.25m diameter (0.00982m³). The values of resistance to penetration were measured by dinamometric ring penetrometer. The experiment was complete randomized, in a 4 x 2 factorial, with 3 replications. For the water content at tension of 0.01MPa, the value of resistance to penetration limit to dry land rice yield was 2.38 and 2.07MPa, respectively, for LVd and LVef. Higher rice yield was obtained in smaller value of resistance to penetration in water content at tension of 0.05MPa. The dry land rice was less productive in soil with water content at tension of 0.05MPa.
Descrição
Palavras-chave
Oryza sativa, soil compaction, Soil water content, Oryza sativa, compactação do solo, Conteúdo de água
Como citar
Ciência Rural. Universidade Federal de Santa Maria (UFSM), v. 34, n. 6, p. 1793-1800, 2004.