Abstract: The present disclosure provides granular fertilizer compositions and methods of manufacturing thereof. The method for manufacturing the granular fertilizer comprises a declining weight measurement process, a mixing process, a compaction process, and a sorting and cleaning process to produce the granular fertilizer. The granular fertilizer composition may be comprised of urea, metabasalt, and a humic substance. The granular fertilizer composition may alternatively comprise metabasalt, biochar, and a humic substance. The present disclosure also provides a compound fertilizer composition comprising metabasalt at a preferred percentage by weight.