Minnong NPK not only provide main contains of elements N,P,K and other trace elements which satisfied all need of plants grow but have the following features: 1.First one aimed at repair soil harden fertilizer. 2.First one without polymer coating fertilizer. 3.First one prevent losing fertilizer. 4.Eco-friendly fertilzier. Remark: Free sample are available request. Related video and pictures can be offered. Factory always open to welcome your visiting!