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Tillage Effects on Hydraulic Properties and Macroporosity in Silty and Sandy Soils

^a Univ. of Rostock, Institute for Land Use, Justus-von-Liebig-Weg 6, D-18059 Rostock, Germany
^b Brandenburg Univ. of Technology, Cottbus, Chair of Soil Protection and Recultivation, P.O. Box 101344, D-03013 Cottbus, Germany

View larger version (12K): [in a new window]   Fig. 1. Boxplots of Ks values for the conventional and conservation tillage plots of the Lietzen site, determined with the hood (HIF) and the ring (RIF) infiltrometer. The numbers of measurements are given in Table 3. Boxes denote the 25th and 75th percentiles positions, the continuous bar inside the box shows the median and the dash-dotted line the mean value; the whiskers denote the 10th and 90th percentiles; outliers are indicated as triangles. This notation applies also to subsequent box plots.

View larger version (13K): [in a new window]   Fig. 2. Boxplots of Ks values for the conventional and conservation tillage plots of the Adenstedt site, determined with the hood (HIF) and the ring (RIF) infiltrometer. The numbers of measurements are given in Table 3.

View larger version (16K): [in a new window]   Fig. 3. Boxplots of macroporosity values for the conventional and conservation tillage plots of the Adenstedt and Lietzen site, determined with the hood infiltrometer (HIF). The numbers of measurements are given in Table 4. For each study plot, the left side box plot denotes macroporosity values calculated with the approach of Watson and Luxmoore (1986), and the right side box plot denotes the values calculated with the method of Bodhinayake et al. (2004).

View larger version (13K): [in a new window]   Fig. 4. Measured water retention curves (0- to 10-cm soil depth) for the conventional and conservation tillage plots of the Adenstedt and Lietzen sites. The number of replications for each suction head and treatment/plot is n = 3. For better clearness of this graphic, error bars are not given.