Penetration resistance in a latosol under different moisture and penetration speeds

Revista Ceres

Walter Francisco Molina Jr²  Sônia Maria Stefano Piedade¹  Juarez Rennó Amaral¹ 

[1] ,Escola Superior de Agricultura 'Luiz de Queiroz' Departamento de Engenharia de Biossistemas Piracicaba São Paulo ,Brasil

关键词: cone index;    soil compaction;    soil density;    índice de cone;    densidade do solo;    compactação;   

DOI  :  10.1590/S0034-737X2013000500016

来源: SciELO

【 摘 要 】

The soil penetration resistance has been used to represent the compaction situation and several authors have attempted to relate the cone index (CI) with the bulk density. The importance of using the CI as source of information for decisions in agricultural activities, livestock and forestry manner, has become increasingly larger, which requires more knowledge about the penetrometers and penetrographs behavior. This study aimed to verify, in controlled laboratory conditions, the influence of soil water content and cone penetration rate to obtain the cone index, when density variation occurs. The soil was compacted by compression through a universal press cylinder which was specially designed to produce the test specimens. Bulk densities were determined from samples taken from the test specimens and their moisture content. The CI values obtained were between 0.258 and 4.776 MPa, measured in 4 moistures and 7 soil densities with 3 penetration speeds. It was concluded that the determination of IC is strongly influenced by the soil moisture but the penetration speed variation, used in this study, was not sufficient to influence the IC determination. However, the decrease in soil water content may increase the sensitiveness to detect a variation in bulk density by the use of cone index.

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License