Effects of uniconazole application on dwarfing,fruit traits and quality in banana
[Objective]The effects of different enoconazole treatments on the plant dwarfing,fruit traits and quality in banana were studied to screen out the treatments with significant and stable dwarfing effects,so that to provide references for banana dwarfing,condensed planting and green cultivation.[Method]By using water as the control,different doses of three plant growth regula-tors viz.,enoconazole(X1-X3:0.1,0.3,0.5 g/plant),paclobutrazol(D1-D3:0.1,0.3,0.5 g/plant),and cycocel(A1-A3:0.1,0.2,0.3 mL/plant)were tested at the present experiment.Sixteen treatments of enoconazole(X1,X2,X3),paclobutrazol(D1,D2,D3),enoconazole+paclobutrazol(X1D1,X1D2,X1D3,X2D1,and X3D1),and enoconazole+cycocel(X1A1,X1A2,X1A3,X2A1,and X3A1)were designed for root watering(200 mL/plant)in banana variety Guijiao 9 for the first time at 16-18 leaf stage and the second time after 28 days.The effects of different treatments on plant height,fruit traits and quality in Guijiao 9 were observed.[Result]As compared with the control,with the increase of applying dose and frequency of enoconazole,paclobutrazol,and enoconazole mixed agents,the plant height showed a change trend of continuous dwarfing.After applying single unicon-azole and paclobutrazol for 1-2 times,the plant height was shortened by 12.7-94.3 cm.The dwarf-ing degree of plant height in different treatments presented as X3-1>X2-1>X1-1,X3-2>X2-2>X1-2,D3-1>D2-1>D1-1,D3-2>D2-2>D1-2.Under the same dose conditions,the dwarfing de-gree of plant height treated with enoconazole was significantly higher than that treated with pa-clobutrazol.After being treated with enoconazole mixed agents for 1-2 times,the plant height was significantly reduced by 31.3-73.4 cm as compared to the control.The dwarfing degree of plant height in different treatments was as follows:X3D1-1>X2D1-1>X1D3-1>X1D2-1>X1D2-1>X1D1-1,X3D1-2>X1D3-2>X2D1-2>X1D2-2>X1D1-2,X3A1-1>X1A2-1>X2A1-1>X1A3-1>X1A1-1,X3A1-2>X2A1-2>X1A2-2>X1A3-2.The yield per plant,bunch length,and fruit traits were decreased in varying degrees in the treatments X2,X1A2,X2A1,X1D2,and X2D1;of which,the treatments X1D2-1,X2D1-1,and X2D1-2 presented the most significant decrease in yield per plant.Compared with the control,most treatments of enoconazole single or mixed agents significantly increased the contents of potassium and soluble solids in fruit pulp,while reduced the starch content;they also increased sucrose and soluble sugar contents,and sugar acid ratio in varying degrees,therefore improved the fruit quality and taste of banana.[Conclusion]Taking into ac-count the effects of single agent and mixed agent treatments of enoconazole on plant dwarfing,yield per plant,fruit quality in banana,and based on the requirements of green production technology and the principles of simpleness,stability and suitable dose,it is recommended to apply 0.1-0.3 g/plant(X1,X2)of enoconazole for 1-2 times at 16-18 leaf stage on banana production.
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