what is ferrous sulphate

{"cid":"91222605","title":"High Purity Ferrous Sulphate 98% Industrial \/ Agricultural Grade Ferrous Sulphate Monohydrate","imgUrl":"https:\/\/img.chinax.com\/nimg\/94\/b3\/a16c301452a0ab307bfc4677dc22-200x200-1.jpg","attrs":{"Price":"USD210\/Ton","Brand Name":"AOXINCHENG","Model Number":"Ferrous Sulfate Monohydrate","Minimum Order Quantity":"27 Ton","Delivery Time":"7-10 Days","Place of Origin":"Shandong\uff0cChina","Payment Terms":"L\/C, T\/T","Supply Ability":"20000Ton\/Year","Packaging Details":"Custom Packaging","Product Name":"Ferrous Sulfate Monohydrate","Ferrous Sulfate (FeSO4\u00b7H2O)":"\u226591%","Iron\uff08Fe)":"\u226530%","Lead (Pb)":"\u22640.002%","Cadmium (Cd)":"\u22640.0005%","Arsenic (As)":"\u22640.0002%","Melting Point":"64\u2103","Fineness":"\u226595%"}}