Soil hydrophobicity: comparative study of usual determination methods

Ciência Rural

Eduardo Saldanha Vogelmann¹  José Miguel Reichert¹  Juliana Prevedello¹  Gabriel Oladele Awe¹  Dalvan José Reinert¹ 

关键词: water repellency;    water drop penetration time;    water infiltration.;    repelência à água;    tempo de penetração da gota;    infiltração de água.;   

DOI  :  10.1590/0103-8478cr20140042

来源: SciELO

【 摘 要 】

Hydrophobic or water repellent soils slowly absorb water because of the low wett ability of the soil particles which are coated with hydrophobic organic substances. These pose significant effects on plant growth, water infiltration and retention, surface runoff and erosion. The objective of this study was to compare the performance of tension micro-infiltrometer(TMI) and the water drop penetration time (WDPT) methods in the determination of the hydrophobicity index of eighteen soils from southern Brazil. Soil samples were collected from the 0-5cm soil layer to determine particle size distribution, organic matter content, hydrophobicity index of soil aggregates and droplet penetration time of disaggregated and sieved soil samples. For the TMI method the soil samples were subjected to minor changes due to the use of macroaggregates to preserve the distribution of solid constituents in the soil. Due to the homogeneity of the soil samples the WDPT method gave smaller coefficients of variation unlike the TMI method where the soil structure is preserved. However, both methods had low coefficients of variation, and are thus effective for determining the soil hydrophobicity, especially when the log hydrophobicity index or log WDPT is >1.

【 授权许可】

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