树番茄苗木生长生理及光合参数对叶面施肥的响应OA

[Objective]This research aims to study the response of physiological characteristics and photo-synthetic parameters of Cyphomandra betacea seedling to different concentrations of foliar fertilization,to pro-vide a theoretical basis for nutrient management of C.betacea seedlings.[Method]One-year-old C.betacea seedlings were taken as the research object,and L9(34)orthogonal design was conducted with three factors(N,P,K)and three level(10,20,30 g/L).With no fertilizer treatment as the control(CK),the response of physi-ological characteristics and photosynthetic fluorescence of C.betacea seedlings to the foliar spraying of nitrogen,phosphorus and potassium was explored.[Result]Compared with CK,foliar fertilization can effectively promote the biomass accumulation and leaf morphological development of C.betacea seedlings,and promote chlorophyll accumulation and photosynthesis.Notably,the biomass,height,and chlorophyll content of seedlings were mostly affected by N,while leaf morphology was mainly regulated by P.Compared with the CK,foliar fertilization treat-ments increased the net photosynthetic rate,transpiration rate,stomatal conductance,and water use efficiency of the leaves to varying degrees,reduced the intercellular CO2 concentration,and significantly affected the maximum fluorescence,variable fluorescence,potential activity of PSⅡ,and maximum photochemical efficiency of C.beta-cea seedlings'leaves.Compared with the CK,each foliar fertilization treatment significantly increased the activi-ties of superoxide dismutase,peroxidase,catalase,as well as the contents of proline and soluble protein.[Conclu-sion]Foliar application of nitrogen,phosphorus,and potassium fertilizers can significantly promote the photosyn-thetic efficiency and growth of C.betacea seedlings,with the T5 treatment(N2P2K3)showing the best result.