Abstract:The effects of inorganic nitrogen(N)and phosphorus(P)concentrations,N∶P ratio and different chemical forms of nitrogen on the uptake rate of N and P by Gracilaria tenuistipitata var. liui Zhang et Xia were studied under laboratory conditions to estimate N,P removing capacity by this red alga. G.tenuistipitata var. liui Zhang et Xia was collected at Nanshan Island,southern China,and cultivated in the laboratory.Apical parts of the alga were used.Nutrients were added as NH\-4SO\-4,NaNO\-3,NaNO\...