With more than 20 different commercially available sulphur-containing fertilizers, it may be a challenge for farmers to choose the best option. Farmers should speak with a local agronomist or extension agent to determine how to best identify and correct deficiencies in their fields.
Sulphur fertilizers can be found in liquid form. Ammonium thiosulphate, potassium thiosulphate, and calcium thiosulphate are the most well-known
Ammonium thiosulphate solution (ATS) is a popular source of S for use in liquid fertilizers because of its solubility and compatibility with various ions. Fertilizer-grade ATS in its commercial form is in a 60% aqueous solution with an (12-0-0-26S) analysis. It is compatible in any proportion with neutral to slightly acidic phosphate-containing solutions or suspensions, as well as with aqueous ammonia (NH3) and N solutions. It is not compatible with anhydrous NH3 or strong acids; thus, a wide variety of N-S, N-P-S, and N-P-K-S formulations are possible utilizing this material. Ammonium thiosulphate can be applied directly by drip, sprinkler or flood irrigation.
Ammonium thiosulphate has gained prominence in North America and is growing in use and importance in Europe, because of its versatility and high S concentration in fluid formulations. Future demand for ATS is expected to continue to grow due to overall increasing recognition of the S benefits and higher recommendation rates.
Potassium thiosulphate and calcium thiosulphate solution, for crops and situations requiring these other nutrients besides S. Thiosulphates (S2O32-) are noncorrosive and nonhazardous to handle; they also are well adapted to the methods used to apply fertilizer solutions. They are clear, liquid fertilizers that are suitable for direct applications or blending, offering versatility to farmers and fertilizer retailers.