Fordham et al (1975) reported soya bean contained more Ca and Fe (3180 and 90 kgg~1, respectively) than a number of common pea and bean species. Kylen and McCready (1975) found that soya bean contained 60 kgg~1 of Zn and more Ca but less Fe (2800 and 16 kgg~1, respectively) than alfalfa, lentils and mung bean. A study of interlaboratory performance (Osborn 1977) observed that defatted soya bean contained