Experimental research into the effect of harrowing unit’s operating speed on uniformity of cultivation depth during tillage in fallow field
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2020
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Abstrakt
Retention of soil moisture is an urgent topic of the day in the cultivation of agricultural
crops. Using fallow fields is one of the ways to solve the named problem, but the tilling of such
fields requires observing some special conditions, in particular, the capillary effects in their upper
soil layers must be cut down. For that purpose, the authors have proposed a special harrow
equipped with the tools capable of fulfilling the above-mentioned task. The authors have carried
out extensive field experiment research into the tillage of fallow soils with the use of the said
implement. In order to apply the implement, a new harrow unit has been developed. The results
obtained during the experiment research have been processed with the use of statistical methods
and it has been established that the depth of harrowing in the tilled field decreases, when the
operating speed of the combined unit under consideration increases to 3.3 m s
–1
. At the same time,
the variances of oscillations of the parameter under research in accordance with the Cochran's C
test remain uniform. Also, the frequency of the harrowing depth oscillations changes
insignificantly. That is supported by the correlation lengths of the normalized correlation
functions of the process under consideration, which, at the above-mentioned operating speed, stay
within the sufficiently narrow range of values: 0.16–0.20 m. According to the results of the
experimental investigations, the maximum value of the normalized cross-correlation function for
the relation between the oscillations of the field harrowing depth and the oscillations of the field’s
longitudinal profile does not exceed 0.12. This testifies to the absence of any substantial
interrelation between the said two stochastic processes, which is quite reasonable in view of the
small values of the variance and period of the oscillations of the field’s longitudinal profile. The
probability of the new combined tractor and harrow unit maintaining the tolerance of the fallow
field cultivation depth oscillations within the range of ± 1 cm is equal to 82%. Within each 1.85 m
of the distance travelled by the combined soil cultivation unit under consideration, only one
instance of the field cultivation depth deviating from the ± 1 cm tolerance can be expected.
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Märksõnad
fallow, field profile, harrow, operating speed, tillage depth, articles