Funções de pedotransferência para a curva de resistência do solo à penetração
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Data
2012-12-01
Autores
Almeida, Cinara Xavier de [UNESP]
Centurion, José Frederico [UNESP]
Jorge, Ricardo Falqueto
Barbosa, José Carlos [UNESP]
Andrioli, Itamar [UNESP]
Título da Revista
ISSN da Revista
Título de Volume
Editor
Sociedade Brasileira de Ciência do Solo
Resumo
Funções de pedotransferência são regressões utilizadas para estimar atributos edáficos dependentes a partir de atributos independentes e de fácil determinação. Nesse sentido, são propostas na literatura diversas funções de pedotransferência que visam predizer a resistência do solo à penetração. Objetivou-se, portanto, com este trabalho, desenvolver e comparar a eficiência de cinco funções de pedotransferência para a curva de resistência do solo à penetração, presentes na literatura, por meio do ajuste de dados obtidos tanto com o penetrômetro de impacto (campo) quanto com o penetrômetro eletrônico (laboratório), em um Latossolo manejado sob diferentes modos (convencional e plantio direto). Foram coletadas amostras indeformadas de solo na entrelinha das culturas, nas camadas de 0-0,10, 0,10-0,20 e 0,20-0,30 m, logo após a semeadura, no florescimento e na colheita, para determinação dos atributos físico-hídricos do solo e também da resistência do solo à penetração, com o uso do penetrômetro eletrônico. A resistência do solo à penetração, obtida com o penetrômetro de impacto, foi determinada conforme a variação do conteúdo de água no solo ao longo do ciclo das culturas. As curvas ajustadas de resistência do solo à penetração tiveram a precisão e a acurácia testadas por meio de parâmetros estatísticos e foram comparadas pelo teste F. Houve sobreposição dos valores estimados pelo ajuste das curvas, evidenciando que a maneira de obtenção da resistência do solo à penetração (campo ou laboratório) não influenciou a relação entre a resistência à penetração e os atributos do solo. As equações RP = aUg b; RP = a(1-Ug)b; RP = ae bUg e RP = a + be não diferiram e foram as mais precisas e acuradas na predição da resistência do solo à penetração.
Pedotransfer functions are regressions used to determine dependent soil properties by independent and easily measurable properties. In this sense, several pedotransfer functions were proposed in the literature, designed to predict the soil resistance to penetration. The purpose of this study was to compare the efficiency of five pedotransfer functions for the penetration resistance curve in the literature, by matching the data obtained from an impact penetrometer (field) and from an electronic penetrometer (laboratory) of a clay Oxisol, under different management systems (conventional and no-tillage). Soil was sampled between crop rows (layers 0-0.10, 0.10-0.20 and 0.20-0.30 m) soon after sowing, at flowering and the end of the crop cycle to determine the physic-hydrical soil properties as well as their resistance to penetration with the electronic penetrometer. For the impact penetrometer, resistance to penetration was determined according to the variation in the soil water content during the crop cycle. The curves of penetration resistance were adjusted, while their precision and accuracy were tested by means of statistical parameters and compared by the F-test. By matching the curves, an overlapping was observed between the estimated values, showing that the way to determine soil penetration resistance (in the field or laboratory) did not influence the relationship between penetration resistance and other soil properties. The equations RP = aUg b; RP = a(1-Ug)b; RP = ae bUg e RP = a + be did not differ and were the most precise and accurate in predicting soil resistance to penetration.
Pedotransfer functions are regressions used to determine dependent soil properties by independent and easily measurable properties. In this sense, several pedotransfer functions were proposed in the literature, designed to predict the soil resistance to penetration. The purpose of this study was to compare the efficiency of five pedotransfer functions for the penetration resistance curve in the literature, by matching the data obtained from an impact penetrometer (field) and from an electronic penetrometer (laboratory) of a clay Oxisol, under different management systems (conventional and no-tillage). Soil was sampled between crop rows (layers 0-0.10, 0.10-0.20 and 0.20-0.30 m) soon after sowing, at flowering and the end of the crop cycle to determine the physic-hydrical soil properties as well as their resistance to penetration with the electronic penetrometer. For the impact penetrometer, resistance to penetration was determined according to the variation in the soil water content during the crop cycle. The curves of penetration resistance were adjusted, while their precision and accuracy were tested by means of statistical parameters and compared by the F-test. By matching the curves, an overlapping was observed between the estimated values, showing that the way to determine soil penetration resistance (in the field or laboratory) did not influence the relationship between penetration resistance and other soil properties. The equations RP = aUg b; RP = a(1-Ug)b; RP = ae bUg e RP = a + be did not differ and were the most precise and accurate in predicting soil resistance to penetration.
Descrição
Palavras-chave
penetrômetro de impacto, penetrômetro eletrônico, atributos físico-hídricos do solo, precisão e acurácia, soil strength, soil compaction, soil-water physical properties, precision and accuracy
Como citar
Revista Brasileira de Ciência do Solo. Sociedade Brasileira de Ciência do Solo, v. 36, n. 6, p. 1745-1755, 2012.