Seed dormancy behavior of weed seeds is a critical determinant of their survival rates in a given cropping system as it helps the weeds to evade herbicides and other weeding practices. The goal of this study was to find out dormancy breaking treatments for some more prevalent and invasive weeds in Iran. In the preliminary test with H2O, seeds with germination over 65% were put aside and the rest of them were given treatments. Out of 33 species, 6 of them had average germination of 84% in H2O. H2SO4 were used for 8 species; 4 of them (Amaranthus retroflexus, Chenopodium album, Echinochloa crus-galli, alhagi.sp) responded with the average of 87% germination. Two species (Salsola nitraria, Echinochloa crus-galli) were germinated with average of 79% under KNO3 treatment. Scarification could overcome the dormancy of Chenopodium album with 76% germination. Warm water was applied on 2 species, and was effective on Abutilon theophrasti with a germination of 76%. Some species such as Allysum sp., Sinapis arvensis, Goldbachia Laevigata, Avena ludoviciana had very good germination under stratification treatments with average of 77%. Aegilops cylindricl and Rumex crispus also had high average germination of 98% by removing their tunics. The work continues to determine methods for all species showing dormancy. The effects of different temperatures, irradiance and some combined treatments like H2SO4+KNO3 and H2SO4+GA3 are also being investigated.

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