Mohammad Taghi Alebrahim

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1 INTRODUCTION Seed dormancy is a common phenomenon in many plant species, including agricultural and invasive weeds. Defined as the absence of the embryo-to-seedling transition under otherwise favorable conditions, fundamentally seed dormancy allows plants to control when seed germination occurs. The level of dormancy that a seed begins with is influenced by myriad environmental and parental factors (reviewed in Iwasaki et al., 2022).

A HPLC-UV detection system was used for determination of sulfosulfuron and tribenuron methyl residues from soils. The soils were fortified with sulfosulfuron and tribenuron methyl at rates of 26 and 15 g a.i. ha?1 respectively and samples were taken randomly on 0 (2 h), 1, 2, 4, 10, 20, 40, 60, 90 and 120 days after treatment. The final extracts were prepared for analysis by HPLC. The results showed that degradation of both herbicides in the silty loam soil was faster than sandy loam soil.