TY - RPRT TI - Controlled and renewable release of phosphorous in soils from mixtures of phosphate rock and NH4-exchanged clinoptilolite AU - T.-M. Lai AU - D. D. Eberl PY - 1986 DO - 10.1016/s0144-2449(86)80010-0 UR - https://pubs.usgs.gov/publication/70014922 ID - 70014922 ER -