Distribution of Soil Iron Chemical Forms in some Golestan Province Soils

Iron is one of the essential micronutrients for plants. The various components of soil elements differ significantly from each other in terms of reactivity and bioavailability. The purpose of this research was to study the distribution of different forms of Iron among the various soil components and the relationships between the metal components with some soil characteristics. So, an experiment was carried out on 10 samples collected from different areas of Golestan province with different chemical and physical properties. Fractionation of soil iron was determined via Singh et al (1988)’s sequential extraction procedure. For investigating the relationship among the various forms of soil iron with dry matter, concentration and uptake of iron, a factorial pot experiment on Glycine max cv. Williams in a completely randomized design (10 types of soil at first factor and two iron fertilizer levels (0 and 20 Fe mg kg-1) at second factor), with three replications was also conducted. The results showed that the amounts of iron chemical forms were ordered as follows: carbonates-bound