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Sulfur in Powder 25kg 98% Elemental Sulfur Micronized GEMMA GEMMA. Sulfur from GEMMA is offered in the form of a fine "micronized" powder, i.e. it consists of grains of micrometer (μm) size - one millionth of a meter, 10−6 m. The form in which it is provided and the concentration of Sulfur makes the fertilizer immediately effective. Sulfur within the plant helps to increase the formation of enzymes as well as the building blocks of proteins. In field or garden soil, as well as in potting soil mixes, it corrects (lowers) soil pH and improves the effectiveness of nitrogen fertilizers. It is applied by spreading or linearly in quantities of 3 to 5 kg/stremma, especially in vegetable crops and in the vineyard. The Sulfur in Powder 25kg is also suitable for use in organic farming.