Soft Cutting Propagation Technology of Ulmus pumila ‘Zhonghuajinye’
With Ulm us pumila‘Zhonghuajinye ’ , and one-year branches of the upper part as stem cuttings , each stem cutting retained two leaves .In order to test the influence of different substrates on cutting , stem cuttings were treated with ABT of 1 000 mg· L-1 solution for 10 s and inserted into eight soil substrates including river sand , perlite, vermiculite, peat, per-lite∶vermiculite=1∶1, perlite ∶vermiculite=3∶1, perlite ∶peat=1∶1, and perlite ∶peat=3∶1 ( V/V) , respective-ly.With the purpose of screening the best reagent concentration and the best treatment time for U.pumila‘Zhonghuajinye’ cutting, the experiment was conducted using three-factor and three-level orthogonal tests , and the stem cuttings were trea-ted with ABT, IBA, and NAA solution which designing three concentration gradient of 500 mg· L-1 , 1 000 mg· L-1 , and 1 500 mg· L-1 for 10 s, 30 s, 60 s, and inserted into substrate of perlite ∶vermiculite=1∶1.The vermiculite is the best soil substrate, the rooting rate of cuttings reached 89.17%, the average number of substrate on cuttings was 10, the length was 12.92 cm, and the longest root length was 38.5 cm.By the orthogonal tests , the rooting rate of stem cuttings treated with IBA of 500 mg· L-] for 30 s reached 82.22%, the longest average root length reached 21.12 cm, and the maximum average number of substrate on cuttings was 17.Using the method of multiple comparison , the rooting rate of U.pumila‘Zhonghuajinye ’ cuttings could reach highest when their cutting bases were treated with IBA of 1 500 mg· L-1 for 30 s.
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