Abstract: The effects of shading and phosphorus application on the growth and chlorophyll fluorescence parameters of Fagophyrum dibotrys（D.Don）Hara（Abbreviated as FD）were studied for laying a theoretical foundation for setting light and phosphorus during the cultivation of FD. Setting 3 shading strengths（no shading;light shading：shading 40%-45%;severe shading：shading 90%-95%）and 2 phosphorus application tests（not added and add 14.4 g/pot）. Shading increased the morphological indicators of FD（such as leaf area,height,root length and other morphological indicators）,as well as chlorophyll content and chlorophyll fluorescence parameters,but reduced leaf thickness. Phosphorus application increased the number of FD leaves,leaf area,height,biomass accumulation,photochemical quenching coefficient（qP）and other indicators. Compared with the control,shading 40%-45% promoted the morphology,biomass,and photosynthetic efficiency（Yield）of the FD more largely than shading 90%-95% while applying phosphorus. In sum,appropriate shading and phosphorus application in actual production are beneficial to the reduction of photosystem damage by the FD,thus promoting the growth of morphological indicators and increasing yield.

Key words: Fagopyrum dibotrys（D.Don）Hara, shading, phosphorus, chlorophyll fluorescence