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Granular Iron Sulphate 1kg Fertilizer GEMMA GEMMA. The Iron Sulphate is suitable for the prevention and treatment of iron deficiencies (chlorosis) in all crops as well as for correcting the soil pH. Iron is a key element in the growth of plants, since it has a key role in determining enzymes that take part in the synthesis of Chlorophyll, in the process of respiration, while it contributes to the smooth and efficient development of the plant's over-ground and underground system. The Granular Iron Sulphate 1kg by GEMMA is applied throughout the growing season, once every 3 to 4 weeks by spreading on the ground or in the soil mixture (for potted plants such as camellias, gardenias, etc.).