Correction of resistance to penetration by pedofunctions and a reference soil water content

Revista Brasileira de Ciência do Solo

Moacir Tuzzin De Moraes²  Henrique Debiasi¹  Julio Cezar Franchini¹  Vanderlei Rodrigues Da Silva¹ 

[1] ,Universidade Federal de Santa Maria Pos-Graduation Program of Soil Science Santa Maria RS

关键词: pedotransfer functions;    Oxisol;    impact penetrometer;    soil compaction;    função de pedotransferência;    Latossolo Vermelho;    penetrômetro de impacto;    compactação do solo;   

DOI  :  10.1590/S0100-06832012000600004

来源: SciELO

【 摘 要 】

The soil penetration resistance is an important indicator of soil compaction and is strongly influenced by soil water content. The objective of this study was to develop mathematical models to normalize soil penetration resistance (SPR), using a reference value of gravimetric soil water content (U). For this purpose, SPR was determined with an impact penetrometer, in an experiment on a Dystroferric Red Latossol (Rhodic Eutrudox), at six levels of soil compaction, induced by mechanical chiseling and additional compaction by the traffic of a harvester (four, eight, 10, and 20 passes); in addition to a control treatment under no-tillage, without chiseling or additional compaction. To broaden the range of U values, SPR was evaluated in different periods. Undisturbed soil cores were sampled to quantify the soil bulk density (BD). Pedotransfer functions were generated correlating the values of U and BD to the SPR values. By these functions, the SPR was adequately corrected for all U and BD data ranges. The method requires only SPR and U as input variables in the models. However, different pedofunctions are needed according to the soil layer evaluated. After adjusting the pedotransfer functions, the differences in the soil compaction levels among the treatments, previously masked by variations of U, became detectable.

【 授权许可】

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