Mined here in Tennessee, all natural TN BROWN ROCK PHOSPHATE is a natural, slow release source of phosphorus.
A 21-25% PO natural, "Reactive" rock phosphate (0-3-0)20% calcium, and broad spectrum of trace minerals (NOP). The premier Phosphate in the US today. It is the cleanest, least costly and highest available phosphate of any working deposit. Material is 8-10% moisture as it is naturally hydroscopic. Will spread with a spinner spreader most seasons of the year but may require lime spreader if high humidity.Usually applied at 300-500 lb/acre(0-3-0, 21-25% total P 2 O 5) 40% CaO with a normal use rate of 300-500 lbs./ac. Thats roughly 8-11 lbs. per 1000 square feet.