Role Of Organic Matter On Availability Of Some Micronutrients In Soils

Sandy and calcareous soils under our arid climatic conditions are very pooor in its organic content which is generally known as a source and solubilizing factor for the native insoluble froms of nutrients such as zinc manganese . Oranic manures are well established to be involved in the fertilization plan in almost all the world . Besides, in areas where mineral fertilizers are either not readily available or too expensive for general use, organic manures are almost the only for maintaining soil fertility . Organic materials influence the physical, chemical and biochemical characteristics of soil, which in turn influence the growth and development of plants . Therefore, the present investigation was undertaken to Facus some lights on the direct and indirect role of some organic manures, i.e., town refuse alone or combined with Zn So 4.7H 2o o r Mnso4. 7H2O, piqeon refuse, chicken manure and farmyard manure with ZnSO4 .7H 2O or Mnso4 . 7H2o on the availability of Zn, Mn and N to corn plants at different growth periods.