C - Lublin

Table 1. Averaged mean and root mean square differences, calculated for
pF-curves of different tillage treatments
MD RMD
m 3 /m 3 m 3 /m 3
NT_03 0.003 0.025
NT_06 0.008 0.021
NT_08 -0.004 0.029
NT_10 -0.004 0.024
P_03 0.004 0.040
P_06 0.003 0.026
P_08 0.002 0.027
P_10 -0.002 0.025
LP_03 0.000 0.028
LP_06 0.021 0.034
LP_08 0.034 0.037
LP_10 0.012 0.024
MD RMD
m 3 /m 3 m 3 /m 3
D_03 0.035 0.048
D_06 0.038 0.044
D_08 0.029 0.036
D_10 0.012 0.025
LD_03 0.017 0.030
LD_06 0.038 0.047
LD_08 0.020 0.028
LD_10 0.018 0.026
Table 2. Mean and root mean square differences, calculated for the pF-curves of
each sampled soil layer of the ploughing treatment
MD RMD
m 3 /m 3 m 3 /m 3
P_03 0.005 0.036
P_06 0.003 0.023
P_08 0.005 0.026
P_10 -0.003 0.031
CONCLUSIONS
The formula, proposed by Sobczuk and Walczak (1996), used in this paper
allows estimation of soil water retention curves of tilled soils from bulk and
particle densities, which are more easy and quick to measure. Using this method
the seasonal variability of the bulk density of a previously examined soil unit can
be translated into the hydraulic properties variability, avoiding time consuming
measurements of the latter ones. Thus, dataset, required for the development of the
soil water balance simulation models to consider the seasonal variability of the soil
hydraulic properties, can be constructed.
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