we are according the customers detail requirements. Such as add the elements NPK as well as other element Ca, Mg, Mn, Zn etc. SHANDONG LVFENG FERTILIZER CO.,LTD. is established in 1999,and located in ZIBO CITY, SHANDONG; specialized in manufacturing of N.P.K. compound fertilizers with brand-- ZINONGWe are manufacturer & exporter of formular fertilizers(NPK), water soluble fertilizer, chemical ...