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The behaviour of FeSO4, FeEDTA and FeEDDHA added to a Vertisol (pH 8.3) and an Alfisol (pH 5.8) was studied by periodically monitoring DTPA extractable Fe in soil samples incubated at — 33 kPa soil moisture at 30°C for 8 weeks. It was found that FeEDDHA was most effective in both Alfisol and Vertisol in maintaining high amounts of extractable Fe during 8 weeks. Both FeSO4 and FeEDTA were completely ineffective in the Vertisol though they were moderately effective in the Alfisol. These results suggest that FeEDDHA is the most effective source of iron for soil application in the high pH Vertisols

Extractable iron in two soils of contrasting pH fertilized with ferrous sulfate, FeEDTA and FeEDDHA