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An experiment was undertaken studying the effects of genotype, treatment with growth regulators and duration of rooting period on the percentage of rooting and quality of the root system of green cuttings of giant sequoia (Sequoiadendron giganteum (Lindl.) J.Buchh.). Cuttings were taken from 18 ten-year seedlings of 10 species of origin. The duration of rooting period (3 months vs. 5 months) was statistically reliable for root- and callus formation rates. The extension of rooting period for twodoi:10.7251/agren1702121i fatcat:72rs5ugxefdm5io55xkxogvnfu