SOP is not really a By natural means transpiring mineral, and typically need to be created by means of chemical techniques. Due to resource-intensive processes utilized to produce it, SOP is priced greater than MOP. The commonest method applied to provide the fertilizer SOP is known as the Mannheim method. https://sri-lanka-fertilizer82356.blogvivi.com/27319534/details-fiction-and-organic-fertilizer-for-sale