| Effects of Ca , Zn, Fe on growth and contents of Ca, Mg, Fe and Zn in different varieties of amaranthus, celery and spinach were studied respectively with hydroponics. Correlation of different minerals and varietal difference were investigated.1. Amaranthus grew normally with 20mgCa2+/L in culture solution. Ca content in the shoots of huahongliuye, huahongjianye and baiyuanye amaranthus reached the maximum with 100mgCa2+/L. Ca content saturation in the plants were observed with further increase of Ca concentration in solution. Ca supply showed little influence on Fe and Zn content but strongly inhibited Mg accumulation in leaves. There were obvious difference of Ca, Mg, Fe and Zn contents among tested amarathus and the huahongliuye amaranthus contained the highest mineral content compared with other three.2. Spinach did not show Zn deficiency symptoms but the contents of Ca, Fe, Zn in leaves were low under low Zn supply. The content of mineral and yield were improved when Zn supply was0.4 mg·L-1 .The development of root was restrained by excessive Zn, which decreased the yield of spinach. The mineral nutrient value of qiulu spinach was highest in the four spinach varieties.3. Celery was did not show Fe deficiency symptoms when grew in solution with 0.7mgFe·L-1 and Fe content of celery leaves reached the highest when Fe concentration was 1.4 mg·L-1. The yields and content of Vc, protein and chlorophyll of celery were higher but nitrate lower when Fe concentration was 2.8 mg·L-1. Four celery varieties did not show Fe toxic symptoms in all Fe levels from 0.7～14 mgFe·L-1. Ca and Mg contents in celery leaves was little affected by the different Fe level, while Zn was retarded, as it competed with Fe.
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