Well Im Using micro fert with FE (EDTA) and addition of 13% Fe HEEDTA helate. Daily dose od Fe is around 0.07ppm. It gives 0.49 weekly. The micro fert is intermag Mikro plus (10ml mixed with 490ml of Ro + 4grams of 13% Fe salt) which gives in 5ml per 100l water 0.07ppm of Fe with reasonable Cu, zn, b and mn.A picture of health Mike what's your fertiliser regime