Seed lots of ramirez grass (Paspalum guenoarum Arech. var. guenoarum) from three different nitrogen fertilization leveIs (0,75 and 150kg N.ha-1) recently harvested and stored for 16 months in a cold dry chamber
(± 15°C and ± 30% relative humidity) were submitted to treatments with sulfuric acid scarification (0, 5, 10 and 15 min.) 0,2% potassium nitrate (with and without) aiming to evaluate the best requirement for germination of those seeds in laboratory conditions and the possible relationship between the seeds treatments and storage. The experiment was laid out at completely randomized design in with a factorial arrangement of treatments with eight replications of one hundred seeds each, 3 x 4 x 2, respectively for nitrogen levels, scarification time and KNO3. Germination was conducted at 20-35°C under light. Lately harvested seeds were affected by scarification time H 0.05). KNO3 decreased germination after 9mm of scarification. Germination was higher at 13mm with H2SO4 without KNO3. At 15 min. KNO3 depressed germination from 72 to 67%. Germination capacity was lower without H2SO4 scarification within the three N levels. The lowest germination values were presented by the seeds without H2SO4 treatment and from the higher N level. Stored seeds gave better germination percentages without H2SO4 treatment and from the highest N level. KNO3 effect was significant only at 5min. of H2SO4 treatment when germination decreased 6%.