Spectral behaviour of winter oilseed rape experimental plots was analysed in relation to plant density variations. Field spectral measurements made with the CIMEL CE313 luminance meter at two wavelengths, 650 nm and 850 nm, were evaluated for their use in two widely used reflectance indices: NDVI and RVI. Statistically significant differences of reflectance factors and vegetation indices between plots with various seeding rates were observed. The spectral data were related, through correlation analysis, to phytometric winter oilseed rape variables. Two crop agronomic parameters: number of plants per square meter after emergence (NPL) and after winter (NPW), and four parameters of individual plants: number of leaves per rosette (NLR), fresh matter of a plant (FMP), number of branches per plant (NBP), height of apical growing point (HAGP), and diameter of root collar (DRC) were analysed. These parameters can be used for estimation of winter oilseed rape crop disposition to winter. Both crop parameters, NPL and NPW, related more closely to spectral data than did the individual plant parameters. No statistically significant correlation was observed only between HAGP and the spectral data. The obtained results confirm the information potential of field spectrometry for estimating winter oilseed rape crop status.