Study On Cultivars Ecological Evaluation And Fertilization And Weeding Control Of Tall Bearded Iris

Along with the fast development of the Landscape industry in our country, the problem of singleness of ornamental plants especially ground covers went short of increasingly extrudes. The too large turfgrass area and high maintenance costs have been influenced the sustainable development of city. Therefore, excellent ground covers must be introduced into the gardens, which can partly replace turfgrass, drought tolerance, cost little to maintain and better ornament. Iris is an excellent perennial flowers,which has the characteristic of better ornamental, better adaptability, abundant variety and better colony function. Iris has a huge underlying development.The research of Iris in foreign country mainly includes breeding, culture and landscape designing are also much studied. But because of different horticultural equipments,environmental condition and cultural modes between areas, it is different that the results of the studies applies to China directly. While introducing a great deal of tall bearded irises, select the irises adaptive to the local natural condition and different application by ecological evaluation. It is significant for the new cultivars selection and seedling and the application to study the fertilizing technology and chemical weed control on irises. The study passed particularity programming, introducing a great deal of tall bearded iris. Observe the ecological habit, the leaf character, flower character, florescence and disease assistance of cultivars. Using the AHP analytic hierarchy process and grey system theory to evaluation, select adaptive cultivars. Study the appropriate fertilization proportion and quantity and discuss chemic weeding control on irises.The result is below:1. The cultivars hyper-90cm are Conjuration, Yaquina Blue, Diabolique, Monet's Blue, Jazz Festival and Dynamite which are suitable to cutting flower. The cultivars fewer than 60cm are Velvet Underground, Throb and Play With Fire which are suitable to use as cutting flower. And the others are intervenient can be used as cutting flower and cutting flower. 2. The cultivars of flower diameter hyper-18cm are Letten Prayer, Bold Look, Yaquina Blue and Monet's Blue. The cultivars fewer than 14cm are Merlot, Nordica, Play With Fire, Dream Of You, Laced Cotton, Vanity's Child, Vision in Pink, Fashionably Late and Megabucks.3. The cultivars of flower showing highness hyper-45cm are Diabolique, Monet's Blue, Fashionably Late, Jazz Festival and Avalon Sunset which value are high. The cultivars fewer than 10 are Bold Look, Violet Turner, Letten Prayer, Velvet Underground and Throb which value are low.4. The cultivars days of florescence hyper-30 days are Letten Prayer, Conjuration and Throb. And less than 20 days are Merlot, Vanity's Child, Neutron Dance, Avalon Sunset and Orange Impact.5. The cultivars of leaf breadth hyper-6cm are Monet's Blue, Jazz Festival, Brazilian Holiday, Yaquina Blue and Bal Masque. And fewer than 4cm are Velvet Underground, Laced Cotton, Nordica, Finalist, Megabucks, Goodbye Girl and Throb.6. About ant-disease, the cultivars rot rate hyper-90% are Megabucks, Dream Of You, Vanity's Child, Velvet Underground, Brazilian Holiday, Conjuration, Last Hurrah, Violet Turner, Swingtown, Letten Prayer, Monet's Blue, Let's Boogie and Dynamite. And less than 20% is Avalon Sunset.7. The cultivars of the growth speed after returning green hyper- 40cm/30 days are Yaquina Blue, Monet's Blue, Dream Of You, Rapture in Blue, Jazz Festival, Fashionably Late, Vizier and Violet Turner. And fewer than 25cm/30days are Goodbye Girl, Orange Impact, Merlot, Play With Fire, Throb, Last Hurrah and Laced Cotton which need a long time to reach the due value.8. On the years of 2005 and 2006, observation the tall bearded iris introduced. Integrate two years's ecological habit, the leaf character, flower character, florescence and disease assistance of cultivars. Using two methods to evaluation, selected some cultivars of excellent characteristic. The selected cultivars are Yaquina Blue, Nordica, Conjuration, Fashionably Late, Finalist and Avalon Sunset kinds. Via evaluation result, finding the two method are feasible to evaluating iris.9. Using metolachlor at the level of 0.15 ml/m2~0.25ml/m2 or above can effectively control gramineous weeds and broad-leaved weeds. On the safety influence Fluazifop has notable difference from Sethoxydim. So in the area of more gramineous weeds using sethoxydim at about the level of 0.30 ml/m2 has perfect result.10. The proportion 1-2-2,2-1-2 has perfect result. And at the level of N 0.1g/kg,P2O5 0.2g/kg,K2O 0.2g/kg or N 0.2g/kg,P2O5 0.1g/kg,K20 0.2g/kg or above has better effect.