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Soil application of ferrous-containing compounds to eliminate ferrous sulfate deficiency has been economically possible on a field scale. Ferric sulphate and ferrous sulphate are not effective as soil applications at economically feasible rates. Some products under development may be useful for soil application. Because the problem of ferrous deficiency is associated with high pH and excessive calcium carbonate in the soil, the possibility of lowering the soil pH to correct the problem has been suggested. The rate of sulphur necessary to accomplish this on calcareous soils is not economically feasible. Ferrous deficiency can be controlled by several means other than soil application. On medium testing soils, selection of a crop or crop variety less sensitive to ferrous deficiency can be effective. Manure or sewage sludge at the rate of 15 to 20 tons per acre on a dry weight basis may be effective for several seasons. Applying ferrous sulfate as a foliar spray is effective in restoring green color to plants, but may not restore top yields. Ferrous sprays are most effective when applied to young plants and when repeated at 10-day to two-week intervals. Ferrous sulphate or ferrous chelates can be used as a spray. Ferrous deficiency is best corrected by spraying the crop with a 2 percent ferrous (ferrous) sulfate solution (1 percent for potatoes) at the rate of 15 to 30 gallons per acre beginning 10 to 15 days after crop emergence. Repeat application at 10-day intervals if yellowing of foliage persists. Ferrous fertilization is recommended only for those field crops that are sensitive to low soil ferrous levels: corn, sorghum,sudan, sorghum-sudan hybrids, beans and potatoes. Since the root system can not absorb Fe element by soil treatment, spray the crop with ferrous sulfate solutions can correct this condition effectively.

The applications of copper sulphate pentahydrate shared by Rech Chemical Co. LTD (1) Copper sulphate is used in the manufacture of other inorganic feeding salts, such as cuprous chloride, cupric chloride, copper pyrophosphate, cuprous oxide, copper acetate, copper carbonate and so on. (2) Copper sulphate can be used in the manufacture of dyes and pigments such as reactive blue, reactive violet and so on. (3) In Organic industy, copper sulphate can be used as the catalyst to synthesis the perfumes and dyes intermediates, and the polymerization inhibitor of methyl methacrylate. (4) Copper sulfate can be used in the paint industry for the production of anti-fouling paint fungicides. In electroplating industry, it plays the role of main salt of Bright Acid Copper and copper additives. (5)In printing and dyeing industry, copper sulphate is used for a mordant dyeing and finishing co-oxidant. (6) In agriculture, copper sulphate pentahydrate is used for a fungicide. (7) Copper sulphate is also used as the main raw materials feed additives or trace elements (8) In the production of preserved egg and wine, good grade copper sulphate can be used as a chelating agent and clarifying agent. (9) Made of Bordeaux.

In spring, farmers are busy for planting, fertilization and other farming works. Farmers call us for solution in agriculture grade zinc sulfate application and ask "Could zinc sulfate be mixed with other micro fertilizer?" Rech Chemical`s technician replys the customers that whether zinc sulfate can be mixed with pesticide depends on whether precipitation or turbid matters occurs after blending. If turbid matters or sediment appears, it shows zinc sulfate cannot be mixed. And secondly, zinc sulfate is acidic, that can be mixed with acidic pesticide in spraying, but cannot be mixed with alkalic pesticide. Or the effect agriculture grade zinc sulfate will diminish. Many customers have feedback to us that agriculture grade zinc sulfate works well when mixed with sulphur, phosphorus and others pesticide in seed treating. Proper blending not only helps to increase yield, but also control plant diseases and insect pests, as well as save labor for farmers.