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NUTRIBUILD Chelated Fe EDTA 12% or NUTRIBUILD Chelated Fe EDDHA 6% - Which one should I use?
Fe-EDTA - This iron chelate is stable at pH below 6.5. Above pH of 7.0, nearly 50% of the iron is unavailable. Therefore this chelate is ineffective in alkaline soils. This chelate also has high affinity to calcium, so it is advised not to use it in calcium-rich soils or water. Note that EDTA is a very stable chelate of micro-elements, other than iron, even in high pH levels. Fe-EDDHA - this chelate is stable at pH levels as high as 10.5, and also effective in calcareous soil.