Volume 9 Article informations The use of natural iron ore Tamra as ferric treatment to correct iron chlorosis in Tomato grown on calcareous soil Ilham Grioui, Abir Ouri, Mohamed Nouri, Abdessatar Hatira Abstract Iron deficiency is a nutritional disorder limiting agricultural production in Tunisia and other Mediterranean countries. Studies about iron fertilization have gained importance in agronomy to improve the productivity. Then, agricultural areas with pH 7.5 affected by iron deficiencies need to be treated. The application of iron chelate /complex, capable of maintain this micronutrient in solution even in soils with high pH, is the most practice to remedy iron chlorosis. The aim of this work was to evaluate the application of iron ore Tamra as iron chelate/complex in calcareous soil El Manar and to study their efficacy for treated iron chlorosis in Tomato. Experimental trials of tests iron ore Tamra as fertilizers was conducted in laboratory during 65 days in random block with three replicates for each treatment. The all of iron treatments (EDTA/Fe (T), Digestat /Fe (T) and EDDHA/Fe) were equal in iron dose (50µmol Fe) and were applied after to the set in of iron chlorosis in plants. The effect of iron ore Tamra to correct iron deficiency has been examined in soil and plants by AAS analysis. The results of applying EDTA/Fe (T) and Digestat/Fe (T) showed positive results and correct the ferric chlorosis with different content but rest lower than the results obtained by EDDHA / Fe. The use of raw iron from Tamra has a good effect on Tomato plants grown in alkaline soil, so this latter confirm the potential valorization as iron fertilizers in agronomy. It can bring positive economic and social effects in Tunisia. Key words: Calcareous soil, Digestat, EDTA, Fertilizer, Iron ore Tamra, Tunisia.