Abstract
Many studies have focused on research about impact of time and density of sowing on the agronomic characteristics of different crops. However, the number of studies investigating such a response on the qualitative composition of different types of winter oilseed rape varieties is still limited. The aim of the research was to determine the effect of sowing date and density on yield, protein and oil content and quality of winter oilseed rape varieties: open-pollinated, a typical hybrid of traditional type of growth and a new semi-dwarf hybrid, which biology and yielding have not been thoroughly established. This experiment was conducted applying four sowing dates (August 14, August 25, September 4, September 15), three winter oilseed rape cultivars (PR45D03 -semi-dwarf hybrid, PR46W31 – hybrid, Californium – open-pollinated) and four sowing rates (30, 40, 50, 60 seeds/m2). Among the compared sowing dates, August 25 proved to be optimal for yielding of the tested winter oilseed rape cultivars. Semi-dwarf variety contained less protein and glucosinolate in seeds, but more oil in comparison to other studied varieties (hybrid and open-pollinated). The yields did not differ significantly within a density of 40, 50, 60 seeds/m2, so it is important result, especially for the agricultural practice.
Highlights
Poland and Great Britain have been ranked interchangeably in sixth place in the production of winter oilseed rape (Brassica napus L.) in the world, after China, Canada, India, Germany and France (FAOSTAT, 2014)
The aim of the research was to determine the effect of sowing date and density on yield, protein and oil content and quality of winter oilseed rape varieties: open-pollinated, a typical hybrid of traditional type of growth and a new semi-dwarf hybrid, which biology and yielding have not been thoroughly established
Our results proved that semi-dwarf PR45D03 variety had higher seed oil content in comparison to conventional Californium
Summary
Poland and Great Britain have been ranked interchangeably in sixth place in the production of winter oilseed rape (Brassica napus L.) in the world, after China, Canada, India, Germany and France (FAOSTAT, 2014). In Poland, winter oilseed rape is the most important oil-protein plant. Increasing use of oil seed rape for biofuel production resulting from the implementation of the European Union (EU) recommendations of the Directive (2009/28/ WE, 2009) has increased the demand for seeds of this crop. Increased acreage of winter oilseed rape, both in Poland and in the world is a huge challenge for agriculture. It requires intensification of production which is related with threats from pests and the environmental impacts
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