Screening of the optimal substrate ratio of container seedlings of four ornamental grasses
[Objective]The objective of this study is to provide a scientific basis for the industrialization and stan-dardization of container seedlings of four ornamental grasses.[Method]Panicum virgatum'Lanji',P.alopecuroides'Wucai',Andropogon yunnanensis'Prairie Blue'and Carex forficula were selected as the test materials.The effects of different substrate ratios on the growth of four ornamental grass container seedlings were studied by using grass charcoal,garden soil,vermiculite and perlite as materials,and the optimal substrate ratios of the four ornamental grass container seedlings were screened out by comprehensive analysis by membership function method.[Result]The plant height,crown width and tillering number of P.virgatum'Lanji',P.alopecuroides'Wucai'and A.yunnanensis'Prairie Blue'were the highest under peat,followed by peat∶vermiculite=2∶1,and the growth traits of C.forficula were the best under peat∶vermiculite=2∶1 treatment.The leaf length and width of the four ornamental grasses were not completely consistent under different substrate treatments,and the difference in leaf thickness was not significant.The contents of chlorophyll and carotenoids in the four ornamental grasses under the peat-treated treatment were higher than those in the other treatments.Chlorophyll a/b was the lowest in the mixed matrix,and the photosynthetic capacity was strong.The container seedlings of three ornamental grasses,namely C.forficula,P.alopecuroides'Wu-cai'and A.yunnanensis'Prairie Blue',could reach a high level of biomass under the peat:vermiculite=2∶1 treat-ment.[Conclusion]Based on the comprehensive analysis of the membership function method and the consideration of economic cost,this experiment recommended the treatment of peat∶vermiculite∶perlite=1∶1∶1 for P.virgatum'Lanji',and A.yunnanensis'Prairie Blue',P.alopecuroides'Wucai'and C.forficula can be cultivated in a peat∶ver-miculite=2∶1 substrate ratio.
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