Effects of Tillage Method, Drainage Management and Temporal Variability on Some Soil Physical Properties and Organic Matter
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Date
2022
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Publisher
Ankara Üniversitesi
Abstract
Tillage is one of the most important practices affecting soil physical and
hydraulic properties. Its effects may vary intensely according to the tillage
method. This study aims to evaluate the effects of tillage methods (B1:
moldboard plow+disk harrow, B2: moldboard plow+rotary tiller and B3:
chisel plow+disk harrow), drainage (A1: subsurface drainage and A2:
non-drainage) methods and temporal variability (T1: after planting and
T2: after harvesting) on physical properties and organic matter of a clay
loam soil under winter-wheat crop. The experiment was conducted in
split-plot in time statistical design. Soil bulk density, soil particle density,
aeration porosity, aggregate mean weight diameter (MWD), saturated
moisture content and water infiltration rate were determined at two
different times of T1 and T2. Results revealed that the tillage method had
significant effect on organic matter content, such that the highest (1.35%)
values were observed in chisel treatment. Tillage effect was significant
on saturated moisture content, MWD, aeration porosity and infiltration
rate. The effect of time was significant on all investigated factors. The
effect of drainage was significant on MWD and infiltration rate.
Evaluating the effects of tillage and drainage indicated that the
contribution of drainage on changing MWD is higher than the tillage
methods. Further, in non-drainage condition, the tillage method had a
significant effect on aeration porosity (P<0.05), so that moldboard plow
makes much more aeration porosity (25.48%) compared to chisel
(17.17%). Conversely, the MWD of moldboard plow (2.4 mm) was
significantly lower than that of chisel (2.8 mm), in non-drainage
conditions (P<0.05). According to the result, the lowest and highest
values of MWD were obtained in the treatments of A1B1 and A2B3,
respectively. The application of chisel is not recommended in no-drained
areas having high level groundwater, because of the highest saturated
moisture content and MWD along with the lowest aeration porosity
compared to moldboard plow.
Description
Keywords
Aeration porosity, Infiltration rate