Modeling and correction of soil penetration resistance for varying soil water content |
| |
| Authors: | Carlos MP Vaz Juliana M Manieri Markus Tuller |
| |
| Institution: | a Embrapa Agricultural Instrumentation, P.O. Box 741, São Carlos, SP, 13560-970, Brazilb Instituto Agronômico de Campinas, IAC, P.O. Box 28, Campinas, SP, 13020-902, Brazilc The University of Arizona, Department of Soil, Water and Environmental Science, Tucson, AZ, 85721, USA |
| |
| Abstract: | For this study penetration resistance (PR) was measured within the profiles of four Oxisols for a wide range of water contents (θ) and bulk densities. Obtained data were utilized to parameterize 23 previously applied regression models. The most promising models were selected to illustrate effects of soil texture on PR. Finally, a new correction method based on normalization of PR with θ corresponding to a matric potential of − 10 kPa was introduced. Evaluation of texture effects revealed that for very wet soils PR was lowest, but increased with clay content. PR at − 1500 kPa exhibited a maximum at clay content of 35% and at − 10 kPa PR was least affected by texture. From all regression models three- and two-parametric exponential and power functions yielded closest matches to measured data. The proposed correction significantly dampened the influence of θ on PR, which allows better comparison for a specific soil or among different soils. |
| |
| Keywords: | Penetrometer resistance Bulk density Water content Matric potential Soil compaction Regression equations |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
