Effects of Different Growth Regulators on Hardwood-Cutting of Nitraria tangutorum
[Objective]In order to find out the best kind,concentration and combination of growth regulators for promoting rooting of hardwood cutting of Nitraria tangutorum.[Method]In this study,the different growth regulators and concentrations of different treatments were used to control the cutting of woody twigs of Nitraria tangutorum with diameter＞0.4 cm from 2 to 3 years old.[Result]The results showed that there were significant differences under different treatments in survival rate,seedling height,total number of roots,longest root length;and the sur-vival rate of treatment NAA 400 mg/L was the highest,up to 57.69%.The seedling height of treatment Sodium Nitrophenolate 400 mg/L was the highest,up to 38.00 cm.The total number of roots of treatment IBA+NAA 200 mg/L was the highest,up to 15.00 articles.The longest root length of treatment NAA-Na 600 mg/L was the highest,up to 35.00 cm.[Conclusion]After comprehensive evaluation by the membership function method,the membership function value of IBA-K+NAA-Na 600 mg/L treatment is the highest,which was the best treatment for the hard wood cutting of Nitraria tangutorum.
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