To verify the effect of plant population density on final productivity of radish (Raphanus satiznts L.) it was conducted a field trial in the Experimental Field of Horticultural Section, ESALQ, Piracicaba, (SP-Brazil), using 'Early Scarlet Globe' cultivar It was studied biological and economic productivity in 12 different treatments combining inter row (5, 10, 15 and 20 cm) and inter plant (no thining, 4 cm and 8 cm) spacings. It was conducted that higher the spacing between plants, the higher plant development and economic production of roots per area, until the point after that the production is reduced; biological production per area is reduced with increasing spacing. The highest economic production was obtained with 15 cm inter row and 8 cm inter plant spacing.