... polymer heterogeneous aromatic hydroxyl carboxylic acid salt. A black powder with a slightly glossy appearance, it is soluble in water and ... ) Agriculture:i) Used as a multi-function compound fertilizer after combination with nitrogen and phosphorusii) Also used as soil ameliorator, plant growth ... , etc.Outer packing:25kg/paper bag, 50kg/plastic woven bag with PVC liningG.W.: 25.15kg, 50.15kg