Tennessee Brown Rock

Tennessee Brown Rock (TBR) is one of the cleanest slow-release phosphorus sources available. It also contains about 20 percent calcium and provides a full spectrum of trace minerals at low-levels. TBR is typically applied at a rate of 300 to 500 lbs. per acre each year until optimal phosphorus levels are reached. TBR is OMRI-listed and allowed for use on organic farms.

Related Documents
TBR Tag TBR OMRI Certificate