Effects of Different Ratios of Nitrogen,Phosphorus and Potassium on Photosynthetic Performance,Yield and Quality of 'Beibinghong'
To investigate the effects of different fertilization rates of nitrogen,phosphorus and potassi-um on the photosynthetic characteristics,yield and quality of'Beibinghong',by taking'Beibing-hong'as the research object in Xinjiang over five years,to provide a fertilization recommendations for Vitis amurensis Rupr.development in Xinjiang.The"3414"fertilization effect test was conducted to determine the effects of different fertilization rates of nitrogen,phosphorus and potassium on the pho-tosynthetic characteristics of'Beibinghong'leaves,photosynthesis-light response curves(net photo-synthesis rate(Pn)-light intensity(PAR)curves)at the fruit ripening stage,yield and juice-based physicochemical traits.Different models including the right-angle hyperbola(RH)model,non-right-angle hyperbola(NRH)model,exponential(EX)model,and modified right-angle hyperbola(MRH)model,were used to fit the Pn-PAR curves under different nitrogen,phosphorus,and potash fertiliz-er ratios,and to analyze the photosynthetic parameters(Pn,Tr,Ci,and WUE)on yield and quality responses.The Pn-PAR curve of MRH model was fitted best,and calculated AQY,LCP and Rd,Pnmax and LSP were closest to the measured values.The yield analysis of'Beibinghong'yielded that the fertiliser ratios of N2P2K3 and N1P2K2 increased the yield of a single plant by 282.38％and 234.43％,respectively,compared to the N0P0K0 ratios.Through the physicochemical traits of the juice,it was concluded that N2P2K3 increased total soluble solids,total phenolics,vitamin,and total sugar content by 32.85％,30.77％,17.87％,and 34.13％,respectively,compared to N0P0K0.N1P2K2 reduced total acids by 72.61％and reduced anthocyanin content by 20.69％compared with N0P0K0.A comprehensive comparative analysis showed that fertilization with N,P2O5,and K2O at 93.568 kg/hm2,41.364 kg/hm2,and 109.355 kg/hm2,respectively,effectively improves the photo-synthetic characteristics,yield,and quality of'Beibinghong'during the ripening period.
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