... trace element fertilizer include :Amino Acid chelated with Trace Element EDTA chelated with Trace ElementEDDHA chelated with Trace Element Mainly used as ... past ,people only care about supplement chemical fertilizer like Urea ,NPK,for cropsAnd ignore trace element, however the crops ... ,Crops grow slowly, easy infected by vermin,Bean with low output,Cotton desquamated .wheat ripe late,grain not ...