Foliar Iron Fertilization – A Critical Review

The editor version is available at: http://www.tandf.co.uk/journals/titles/01904167.aspApplication of foliar iron sprays is a common means of correcting Fe deficiency of agricultural crops. However, variable plant responses to iron sprays ranging from defoliation to no effect have been often described in the iron fertilization literature. There is still limited knowledge concerning the mechanisms of penetration of a leaf applied Fe-containing solution and the role of Fe in the leaf. The complex and multi-disciplinary character of the factors determining the effect of iron sprays hinder the development of suitable foliar fertilization strategies, applicable under variable local conditions and for different plant types. The review is directed towards describing some key factors involved on the process of penetration of a leaf applied, iron containing solution as a prior step to briefly analyze the available foliar iron fertilization literature. Iron chemistry, leaf penetration and plant nutrition principles will be merged with the aim of clarifying the constraints, opportunities and future perspectives of foliar iron sprays to cure plant Fe deficiency.Peer reviewe