Accumulation and retransportation of calcium and magnesium in each leaflet were examined for stock 'Asanami,' cultivated according standard methods. In addition, the effects of Ca or Mg on growth, the quality of flower and the concentration of other elements in each part were studied by the use of stock grown in a sand culture with Ca treatments (0-500mg L^<-1>) or Mg treatments (0-300mg L^<-1>). We estimated the critical concentrations of Ca or Mg for the normal growth of stock. The results obtained were as follows: 1. Concentrations of Ca and Mg were higher in lower leaflets than in upper ones. The Ca concentration of each leaflet in creased with progression of the growth stage, but Mg concentration was not changed through out the growth. Neither ion was retransported to leaflets above the tenth leaflet. 2. The critical concentrations (g kg^<-1>) of Ca were 9 at the 21st-30th leaflets, 8 at the 31st-40th leaflets, 3 in stem and 5 in flower, and the range of luxurious absorption was wide. The critical concentration (g kg^<-1>) of Mg was almost 2 at the 11th-30th leaflets and flower, and 1 in stem, and the range of luxurious absorption was narrow in the stem and flower. 3. In almost all of the leaflets, P, Mg and Fe concentrations decreased significantly with the increase of Ca concentration, but Mn and Zn concentrations increased. The increase of Mg concentration significantly induced the decrease of Ca, but increases in P and Mn.
