Effects of Different Proportions of Nitrogen,Phosphorus and Potassium on Photosynthetic Characteristics,Yield and Quality of Pueraria lobata var.thomsonii
The effects of different proportions of nitrogen(N),phosphorus(P)and potassium(K)on photosynthetic characteristics at different growth stages of Pueraria lobata var.thomsonii was investigated to provide a theoretical basis in scientific fertilization management.In order to investigate the response characteristics of P.lobata var.thomsonii in the seedling stage,root tuber formation stage,root tuber expansion stage,and starch accumulation stage under varying nitrogen,phosphorus,and potassium fertilizer proportions,as well as the effects of different fertilization levels on the yield,starch,and puerarin contents of P.lobata var.thomsonii,the"3414"randomized block design was employed.The results showed that the root tuber formation stage was a more sensitive stage to regulate the photosynthesis efficiency of fertilizer application.The yield of P.lobata var.thomsonii was significantly raised by the medium amount nitrogen,phosphorus,and potassium fertilization treatment(N2P2K2)and the low amount nitrogen fertilization treatment(N1P2K2).The content of starch(40％)in low amount nitrogen fertilization treatment(N1P2K2)were the highest,puerarin content of P.lobata var.thomsonii were significantly increased in low amount potassium(N2P2K1)and high fertilization treatment(N2P2K3).In summary,the N1P2K2 combined application scheme could focus more on the yield and quality of P.lobata var.thomsonii.It also enhanced the photosynthetic efficiency of leaves and promoted an increase in P.lobata var.thomsonii yield.Additionally,the combined application of low amount nitrogen fertilization treatment(N1P2K2)increased the starch and puerarin contents of root tubers.
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