The yields over the studied years have been marked by different values, as
evidenced by the perennial crop itself. The smallest crop yield was marked in 2016. In
general, under certain conditions, the yield of the first year showed the maximum value
of 16 t/ ha in the variant of the first planting time period at the depth of 9 cm. Somewhat
lesser yields of 14 and 15 t/ ha were also observed in the variants of the first planting
time period at covering depths of 12 cm and 6 cm. Whereas in the next year of 2017
the yield of the first year was increased to 20 t/ ha in the variant of covering depth of 9
cm. The variant of the first time period with the covering depth of 12 cm showed
slightly less than 18 t/ ha, and the variant with rhizomes' covering depth of 6 cm had
19 t/ ha.
The yield of the second planting time period appeared to be somewhat lower
compared to the first one. First of all, the yield of the variant with the covering depth
of 9 cm through the studied years was the largest (compared to the covering depths of
6 and 12 cm) and amounted to 15 t/ ha in the first year of the research, 18 t/ ha in the
year of 2017 and 21 t/ ha in 2018. Other examined variants of the second planting time
period with rhizomes' covering depth of 12 cm showed the yield of 13 t/ ha, 17 t/ ha
and 20 t/ ha during the corresponding years of the research.
The third period of planting was the smallest as per the obtained yield index, if
compared to previous time periods of planting.
At the same time, for the given period, the variant of the covering depth of 9 cm
was marked by the highest values, which comprised 13 t/ ha in the first year, 17 t/ ha
in the second year and 19 t/ ha in the third year. Other investigated variants of rhizomes'
covering depth were marked by lower productivity. In can be illustrated by the
following – variants with 6 and 12 cm produced 12 t/ ha in 2016. A similar value of
this indicator was achieved in 2017, and in 2018 these values were 17 t/ ha (for variant
with 12 cm) and 18 t/ ha (for that with 6 cm).
Thus, after all, the yield of Giant Miscanthus can be characterized by the highest
values in the first planting time period for the variant with rhizomes' covering depth of
9 cm. Over the years, there has been noted a productivity growth, as it was
demonstrated by the peculiarities of this perennial crop, whose maximum was reached
during the third year of experiments.
Indicators of Giant Miscanthus rhizomes' quality depending on planting
time and rhizomes' covering depth. Soil, climatic and agrotechnical conditions
contributed to intensive growth, both above-ground mass and mass of rhizome, which
allowed to increase the coefficient of rhizomes' reproduction in the first year of
vegetation. On average, the first planting time period was noticed to have bigger
growth of rhizomes by the close of vegetation period during three studied years
depending on planting time and rhizomes' covering depth, compared to other terms of
planting.
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