Rooting Response of Catalpa bungei Softwood Cutting to Different Hormone Treatments and Medium Mixture

A study was conducted on softwood cutting of Catalpa bungei considering the rooting rate and rooting trait by using Yuanjichangguo(Long-fruit and round-base) Catalpa as cutting material in automatic control greenhouse,with controlled air temperature 18—28 ℃ and humidity of 90%—95% during the rooting period.Two kinds of hormones of ABT-1 and NAA were used in different concentrations,treating methods and treating durations,and four kinds of mediums of peat,perlite,sand and vermiculite were adopted in different mixing proportions for the study.The results showed that high rooting rate and good rooting trait were achieved when softwood cuttings were treated with quick dipping of 1 000 mg·kg-1 ABT-1 or 1 000 mg·kg-1 NAA hormone with talc powder mixture,and when the medium mixture of peat∶ perlite = 1∶ 1 was employed.The highest rooting rate of 83% was achieved from the best combination of appropriate hormone treatments and medium mixture for the softwood cutting of C.bungei.The study results can be important references to promote the rooting rate in developing rooted cutting plants of Catalpa bungei.