During the last decades a large area of irrigated lands in Syria has been
shifted from extensive cropping to intensive agriculture. Many kinds of soils
became incapable to supply high yield crops by their micronutrients
requirements. Therefore, th
e deficiency of Zn, B, Mn and Fe was mentioned in
this soil. Humic substances influence micronutrients availability through
chelating, which can either increase or decrease the availability of the
micronutrients (MN). In this framework, two pot experiments were carried out
in a greenhouse at the University of Plymouth (2006) to investigate the effect of
a commercial humic substance (HS) on the micronutrients availability of: Fe,
Mn ,Zn & Cu in two composite surface soil samples collected from Vertic
Cambisols ,southwest of Syria & from Dystric Cambisols, southwest of England.
