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Hibiscus Hibiscus syriacus is an excellent garden flowers, flowering time summer and integrity is of great significance, the summer and fall flowering plant species rare northern cities. For a long time, the development and application of the hibiscus did not attract enough attention to China's horticultural workers, very single application type and form. 2007, National Flower Engineering Technology Research Center from the introduction of 15 hibiscus varieties, these varieties introduced from Japan by the Shanghai Institute of garden. Reasonable promote the application of these varieties in the Beijing area, we must clarify the propagation characteristics of these varieties and breeding conditions, and understanding its adaptability in Beijing, especially resistance to low temperature in winter as well as the value of these varieties. In view of the above problems, expand research to improve the aesthetic value of the hibiscus hibiscus cultivation breeding technology, varieties of cold resistance analysis and comprehensive quality evaluation, seed production and screening of the application and popularization of the northern city of fine varieties has important. Hibiscus varieties to the introduction of the new 15 of 2007-2008 as the research object, the factors that affect hibiscus cuttings rooting in the flower center base greenhouse research trials, hibiscus varieties Propagation by Cuttings study. And compared by conductance method and restore growth method to evaluate the cold hardiness of the 15 varieties under low temperature stress conditions, and using analytic hierarchy process based on existing hibiscus varieties of ornamental value and the environmental adaptability comprehensive evaluation above study, the authors draw the following conclusions: 1. in softwood cuttings hibiscus, differences in rooting ability with different varieties of hibiscus significant, rooting rate of varieties H14 each branch segment reached 100% rooting rate, rooting rate low varieties H12, H15 varieties rooting rate of about 82%; of all varieties are in the upper branches segment rooting the best rooting faster rooting rate and root number was significantly higher than the other branches segment; promoting root the hormone to 400ppmGGR speed dipped in rooting the best results, H1, H3 100% rooting rate reached 14.44% and 16.67%, respectively, compared with the control, the difference is significant; the cutting medium mixing matrix is ??better than a single matrix, which vermiculite: Jane 1:3 and Jane: grass: vermiculite 1:1:1 cutting effect, H3, H11 than sand rooting rate was increased by more than 10%; The the remained leaf cuttings amount to 2 leaf appropriate, H1, H4, H6 rooting rate than leaving a leaf processing increased 10%, 17.77%, 10%, were significantly lower than the difficulty of dealing with water management remain clover, and difficult to produce disease. Hardwood cuttings of hibiscus varieties rooting effect on the branches of the middle and lower segments of the branches the best rooting fastest, rooting rate, root number was significantly higher than that of the upper and the top of the branch segment; promote root hormone 7ppmGGR speed dipped in rooting effect best, H1, H3 rooting rate were 100% and 95.56%, 14.44% and 22.23%, respectively, compared with the control, the difference is significant; the cutting medium mixing matrix is ??better than a single matrix, which perlite: peat 1: cutting effect, H3, H11 rooting rate, respectively, than the sand control 16.66% and 10%; cutting of the lower end of the cuttings to miter appropriate; Sand processing the hibiscus cuttings significant and promote root role, after Sand processing rooting 10d or more in advance than the control, H1, H9, H14 rooting rate was increased by 10%, 18.89% and 4.44%, the difference is significant. Softwood cuttings root than hardwood cuttings fast, rooting rate, root large, but softwood cuttings of high temperature, the transpiration large, the higher management technology, and the cuttings perishable. Hardwood cuttings nursery technology is relatively simple, and easy to manage, just rooting slower, rooting rate is relatively low, and serious fake live. Softwood cuttings for rooting the low rate of varieties suitable for rooting rate of varieties can be selected hardwood cuttings to save production costs. 4. Evaluate the hardiness of 15 hibiscus varieties under low temperature stress by the conductivity method and restore growth method comparison: measured varieties, H6, H9, H11, H14 four varieties hardiness most are can survive temperatures of -25 ℃, promotion and application of a large area in the northern cities of China, H4, H14, H15, H2 four varieties of cold hardiness weakest, -20 ℃ branches already subject to more serious injuries, winter in Beijing area cultivated certain proof measures need to be taken. 5. Analytic Hierarchy Process (AHP) to develop the hibiscus select evaluation criteria and quality evaluation model. Hibiscus varieties of the introduction of 15 according to this evaluation system, a comprehensive evaluation, which is divided into four levels (each level, including the ceiling), including H14, H9, H3, H5, H12 five species not only has a high ornamental value , and with a strong environmental adaptability, Gardens of North vigorously promote the use of improved varieties. Proved by the above study, the author basically solved the issues raised, to explore a set of cutting propagation technology for hibiscus. 15 hibiscus varieties hardiness, Cold varieties elected by a large area of ??applications can be applied in the north. 15 hibiscus varieties values ??by AHP hierarchical classification, selected five high ornamental value, adaptable varieties H14, H9, H3, H5, H12 recommendations to promote the application in the northern city of gardens.
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