The quality of rapeseed seeds is determined by the content of mineral components, protein and fat with favourable fatty acid composition. The aim of the study was to assess leaf gas exchange as well as the yielding and quality of seeds of two varieties of rapeseed cultivated in various crop rotation systems and at different levels of agrotechnology. Three types levels of technologies were used: economical (low-input), moderately intensive (medium-input) and intensive (high-input), different from one another in amounts of nitrogen and sulfur fertilization as well as pest protection chemicals. The study was carried out at the Experimental Centre in Bałcyny (53°36′ N, 19°51′ E, Poland). The varietal factor determined the leaf greenness index (SPAD) and the intensity of photosynthesis. An increase in the level of agrotechnology contributed to a proportional increase in the SPAD value by reducing the transpiration rate (statistically significant only for the Castille variety). The Castille variety responded to the cultivation in crop rotation by an increase in the yield of seeds, protein and the weight of a thousand seeds. As the level of agrotechnology increased, a significant increase in the yield of the Nelson variety seeds was noted. A slight influence of the varieties, the crop rotation system and the agrotechnology level on the mineral component content of rapeseed seeds was also noted. An analysis of the composition of fatty acids demonstrated that their content was modified by the varietal characteristic, the crop rotation system, and the level of agrotechnical intensity. The ratio of acids C18:2/C18:1 was 2.4 on average, which indicates a good quality of the oil.  

4.23.2018