It is important to know that to obtain an accurate soil and land use data, these data should be commercial. Any uncommercial data will be approximate. FAO is one of sources of these data.
This is just one small dataset, but you are welcome to have data from AGCI's 9 stations in the Rocky Mountains of the US-note, only "archived data" in .csv files are calibrated at this time. http://irondataboard.org/
I also second Luca Brocca's recommendation. The ISMN is an excellent international resource.