After EDTA chelation, this product u is free state. Easy absorption, less dosage, quick effect, no residue. This product is a total nutrient fertilizer. You can determine dosage referring to local soil , crops, climate characteristics. Can be directly applied, mixture with NPK and other liquid fertilizer, easy to mix, not antagonism. For crops to resist various diseases caused by lack of trace elements it has other fertilizer irreplaceable function. As using a large number of NPK fertilize, we can maximize fertilizer effect by using this product.