2006
DOI: 10.1590/s0100-69162006000200012
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Abstract: RESUMO:O presente estudo teve o objetivo de analisar, em uma lavoura sob semeadura direta, a distribuição vertical e horizontal da resistência à penetração medida por valores georreferenciados do índice de cone (IC) e a influência do teor de água do solo, permitindo a interpolação para análise de relações causa e efeito. Fatores importantes, como o teor de argila, silte, densidade, espaço poroso e teor de matéria orgânica do solo também foram mensurados. Utilizou-se de um penetrômetro hidráulico eletrônico, re… Show more

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Cited by 12 publications
(11 citation statements)
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References 14 publications
(9 reference statements)
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“…The lower values of resistance to penetration in the surface layer may be associated with the effects of higher concentrations of organic matter, which is consistent with reports of MOLIN et al (2006), who also found lower resistance to penetration values in places with higher concentrations of organic matter, and this increase in organic matter content given by the increment of the straw cover in no-tillage system. Allied to this effect, the action of the furrow mechanism may be considered, which according to KOAKOSKY et al (2007) provides a lower resistance to penetration, and greater effectiveness of the root system of plants to improve the porosity at this depth.…”
Section: Resultssupporting
confidence: 91%
“…The lower values of resistance to penetration in the surface layer may be associated with the effects of higher concentrations of organic matter, which is consistent with reports of MOLIN et al (2006), who also found lower resistance to penetration values in places with higher concentrations of organic matter, and this increase in organic matter content given by the increment of the straw cover in no-tillage system. Allied to this effect, the action of the furrow mechanism may be considered, which according to KOAKOSKY et al (2007) provides a lower resistance to penetration, and greater effectiveness of the root system of plants to improve the porosity at this depth.…”
Section: Resultssupporting
confidence: 91%
“…Figure 3 shows the results obtained for cone index values, for different density and soil moisture degrees. These results indicate that cone index values are influenced by the soil water content, which agrees with the information of Molin et al (2006). Stress variation during the soil compression process and its response during the stabilization period, when the press stopped the dislocation by the force at the maximum, for which it was scheduled (3.842 kN), with soil water content of 0.224 kg kg -1 .…”
Section: Resultssupporting
confidence: 87%
“…Major changes were observed in the cone index for small moisture variations and higher degrees of resistance in clay soils than in sand soils. Furthermore, Molin et al (2006) comment that the soil moisture largely affected by its clay content, is one of the factors that influences the values of cone index measured by penetrometers. Cunha et al (2002) showed similar conclusions, adding the fact that compaction amount also increases cone index values.…”
Section: Introductionmentioning
confidence: 99%
“…Atualmente, os penetrômetros mais utilizados classificam-se em função do seu princípio de penetração (ROBOREDO et al, 2010), desde os mais simples, como os penetrômetro de impacto, que mensuram a RP por cálculos indiretos, até os mais práticos na coleta e capacidade de armazenamento dos dados, como os penetrômetros eletrônicos (MOLIN et al, 2006). Entretanto, a variedade de penetrômetros pode trazer consigo diferenças com relação ao número de dados obtidos, sendo influenciados principalmente pela área e projeção da ponteira (normalizadas pela ASABE, 2006), bem como pela velocidade de penetração (MOLIN et al, 2012).…”
Section: Introductionunclassified