The research aim was to evaluate the productivity of two winter oilseed rape cultivars, Adam and Poznaniak, in three localities in the south of Poland: Głubczyce, Pawłowice and Prusy. The scope of comparisons was broaden through a detailed biometrical analysis of plants and the spectral properties (GAI, LAI and SPAD) of canopy, which determine oilseed rape productivity. At the optimal plant density of two hybrid cultivars of winter oilseed rape: Adam and Poznaniak, three groups of plants differing morphologically and productively were identified. Strongly branching winter oilseed rape of large biomass determined the final density only in 27.2%, but it had the biggest share in seed yield per area unit, reaching 52.5%. The share of small plants of oilseed rape in the canopy reached 37.6%, but they played a minor role in the creation of seed yield. High dynamics of development ratio of winter oilseed rape plants and canopy led to the increased height of plants which, however, was accompanied by a lower number of branches and siliques and a diminished diameter of main shoot and lateral branches.

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