Stable form of iron humate or of other meso and micro nutritive elements available for plant nutrition and method for obtaining it

摘要

Described herein is a complex between humic substances and iron denominated "iron humate" characterized in that it has a structure of the type: where the metal is protected from the pyrophosphate and from the humic substances (SU), obtained through a method comprising the following phases: a) dosage of the humic extracts b) purification of said humic extracts through centrifuging or filter pressing to eliminate any suspended particles c) transfer of the floating product into a mixer d) preparation of a solution of K4P2O710H2O e) mixing solution d) with an aqueous solution of FeSO47H2O containing a minimum quantity of H2SO4 operating slowly and keeping the humic extract under vigorous agitation f) after agitation for a few minutes, rapid drying at 60-90 DEG C.