(5-3-1 N-P-K) A non-toxic slow release nitrogen source with added benefits! Reported to have inhibitory effects on soil-borne pathogens and fungi. Also may have weed-suppressing abilities. A byproduct of crushed mustard seed where the oils are used for biofuel. No pesticides and non-GMO. Apply at 2#/100 sq. ft. or 50#/1000 sq. ft. OMRI-A.