Nutrient content, fat yield and fatty acid profile of winter rapeseed ( Brassica napus L.) grown under different agricultural production systems|
Stepien, Arkadiusz; Wojtkowiak, Katarzyna & Pietrzak-Fiecko, Renata
Quality features of rapeseeds (Brassica napus L.) and
potential for high yielding to a major extent may be defined
by improvements in agricultural engineering methods
that encompass biological progress. However, this is
associated with fertilization and application of pesticides,
which may negatively impact on environment and quality.
It is thus essential to develop and improve edible oil
production systems to satisfy farmer and non-threatening
consumer. The aim of this study was to evaluate content
of nutrients, fat yield and fatty acid profile of rapeseed
grown in two crop rotation system with three levels of
agricultural inputs. Three levels of technologies were
used: economically (low-input), moderately intensively
(medium-input) and intensively (high-input), varied in N
amount and S fertilization as well as protection against
pests. The medium- and high-input technologies applied
in the monoculture contributed to an increased oleic acid
in rapeseeds (by 5.7% and 5.5%), whereas low-input
and high-input technologies resulted in an increased
proportion of linoleic (by 11.6% and 2.1%) and linolenic
acid (by 6.6% and 5.0%) in the monoculture rapeseeds. The
medium-input level generated an increased proportion of
arachidic (from 6.9% to 15.0%), octadecanoic (by 4.9%),
linoleic (by 7.0%), linolenic (by 5.1%) and eicosadienoic
fatty acids (by 17.7%) in rapeseeds cultivated in the crop
rotation system. The increase in technological input level
changed the ratio of polyunsaturated fatty acids to linoleic
and linolenic acids by 5.1% and 7.4% (p < 0.05) in both
crop rotation and by 4.2% and 7.9% monoculture systems.
In general, the impact of winter rapeseed in crop sequence
systems was found to have an insignificant impact on the
content of macronutrients and trace elements in seeds.
The highest fat yield was generated with the crop rotation
system at the highest input level, whereas the lowest yield
was recorded in the low-input monoculture technology.
Cropping system; integrated management; level of technology; rapeseed cultivars.