Fielder Manganese Sulphate WP is a free flowing powder which readily dissolves in water. It is used for foliar application to a wide range of arable and vegetable crops. 32% Mn, 47% SO 3. Our Manganese Sulphate WP is sold in 25kg containers. Fielder Manganese Sulphate WP Label. Fielder Manganese Sulphate WP SDS.