Study on the influencing factors of cutting propagation of Dahlia pinnata
To study the influencing factors of Dahlia pinnata cutting and improve the cutting technical system of D.pinnata,using D.pinnata"Yinghua"as the experimental material,the effects of different cutting periods,cutting specifications,substrate types and the types and concentrations of growth regulators on cutting rooting were studied.The results showed that different periods had a significant impact on the rooting effect of cuttings,the rooting rate,rooting number and rooting effect index were significantly better in May than in other periods;The type of matrices and the type and concentration of growth regulators had signif-icant effects on the rooting effect,the treatment 6(1 000 mg/L IBA+perlite)had the best rooting effect,which survival rate,rooting rate,rooting number,maximum root diameter,and rooting effect index were 95.00％,80.00％,9.54 strips,4.25 mm,and 41.93,respec-tively,which higher than the other treatments.It's rooting rate,rooting number and roo-ting effect index were significantly superior to all other treatments;When the cutting diame-ter was the same,the cutting length of 8 cm was significantly better than the length of 5 cm in multiple indicators.When the length was the same,the cuttings diameter with 4-6 mm was significantly better than the diameter with 2-4 mm.Therefore,the cuttings with a specification of S3(8 cm long and 4-6 mm diameter)had the best rooting effect.In summa-ry,the cuttings with a length of 8 cm and a diameter of 4-6 mm were treated with 1 000 mg/L IBA for 30 seconds,and their rooting effect in perlite was the best in May.
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