In order to break seed dormancy, different temperatures (20, 30, 40, 50, 60, 70, 80 and 90 o C) and durations (10, 20 and 30 minutes) were applied to black locust (Robinia pseudoacacia L.) and honey locust (Gleditsia triacanthos L.) seeds, in the Seed Laboratory of Dicle University -Faculty of Agriculture in 2009. According to the research results, the highest germination rate for black locust seeds was obtained in the case of 90 o C for 30 minutes pre-treatment (94.5%), whilst the lowest value was obtained for the 40 o C for 10 minutes pretreatment (7.5.0%). For honey locust the highest value was obtained at 50 o C for 30 minutes (25.5%) and the lowest value was obtained in the case of control sample (6.8%).
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