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The effects of KNO3 concentration and soaking duration during seed priming on quality of sweet pepper cv. California seed were studied in order to improve the faster germination. The experiment was designed in 2 × 3 factorial in completely randomized design (CRD) with non-primed seed (control). There were two factors including factor A (0 and 3 % KNO3 concentrations) and factor B (24, 48 and 72 hours of soaking durations). The results showed that seed priming with 3 % KNO3 solution for 24, 48 and 72 hours had no effect to increase the germination, but seed priming with 3 % KNO3 solution for 72 hours had fast days to emergence and mean germination time of 11.00 and 16.03 days, respectively.
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