Characterizing bulk density and hydraulic conductivity changes in a potato cropped field |
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| Institution: | 1. Faculty of Civil Engineering, Department of Mathematics, Slovak University of Technology in Bratislava, Radlinského 11, Bratislava, 813 68, Slovakia;2. Faculty of Information Studies, Ljubljanska, 8000 Novo Mesto, Slovenia;3. Faculty of Electrical Engineering and Computer Science, University of Maribor, Koroška cesta 46, Maribor 2000, Slovenia;4. Faculty of Mathematics and Physics, University of Ljubljana, Ljubljana 1000, Slovenia;5. FAMNIT, University of Primorska, Koper 6000, Slovenia |
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| Abstract: | Soil samples were taken at two depths from a potato field during the months of May and July of 1990 to determine the variation of bulk density and saturated hydraulic conductivity with time, depth and machinery traffic. Saturated hydraulic conductivity was measured with the falling head permeameter. In general, conductivity decreased with depth, whereas bulk density increased with depth. Saturated hydraulic conductivity (ksat) at the surface decreased from 6.6 cm/h in May for untracked soil to 0.6 cm/h in wheel tracks in July, while bulk density increased from 1.31 to 1.51 g/cm3. At 20–30 cm depth, ksat decreased from 3.6 to 1.2 cm/h during the same time period, while bulk density increased from 1.44 to 1.71 g/cm3. In some instances, higher values of ksat were observed at lower depths. This could be due to compaction and weakening of soil structure in the upper 10 cm soil layer. |
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