TECHNICAL SPECIFICATIONTECHNICAL SPECIFICATIONITEMSTANDARDAppearanceBlack ball granulesHumic acid( dry basis) , %≥ 7.0Total Nitrogen( dry basis), %≥ 25.0Trace elements, %≥ 1.0Water solubility, %≥ 98.0Moistrue, %≤ 10.0Character: New kind urea fertilizer with high organic material acid and trace elements, mainly use as base fertilizer, top dressing fertilizer, improve the soil condition also ...