Abstract
In a two growing seasons (2010-11 and 2011-12) field experiment carried out in temperate climate of Central Europe, the green
area index, features of siliques and chemical composition of the seeds of two heterosis cultivars of winter rape, cultivated in
three locations: Głubczyce, Pawłowice, and Prusy were compared. It was observed that siliques localization in the specified
crop layer significantly affected fruits productivity. The longest siliques were formed in the middle part of the main shoot and
lateral shoots. Biosocial localization of the siliques in the middle part of the shoot was responsible for highest seeds weight
(0.145 g on the main shoot, and 0.118 g on the lateral shoot). Productive predominance of rape fruits from this layer was a
result of high seeds number in the siliques. The lowest mass of a single rape seed was obtained from the siliques located in the
bottom infructescence layer. Biosocial localization of rape siliques did not affect significantly fatty acids profile of rapeseed
oil, which depended on cultivar features, and to a low degree on vegetation years. The growing seasons only significantly
changed the ratio of n-6 to n-3, which for two seasons 2010-11 and 2011-12 was 1:1.97 and 1:2.16, respectively.
