Determination of zinc, iron and manganese concentration and partitioning during reproductive stages of soybean grown under field conditions

In order to investigate some of micronutrient applications on micronutrient content in plant parts during growth and development stages in soybean (Glycine max L.), we conducted the experiment at field conditions at Kermanshah, Iran. Three levels of zinc (Zn 0 , Zn 20 and Zn 40 as ZnSO 4 ), iron (Fe 0 , Fe 25 and Fe 50 as FeSO 4 ) and manganese (Mn 0 , Mn 20 and Mn 40 as MnSO 4 ) were applied. The results showed that micronutrients in the plant parts decreased from R 1 to R 8 . Therefore, the highest and lowest elements content in plant tissue was obtained at R 1 and R 8 stages, respectively. In addition, Zn, Fe and Mn concentration in leaf, stem, pod and seed at different growth stages of plant were lower than the check treatment. The results at both the years indicated that leaf and stem Fe concentration in soybean decreased faster than the other elements.