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Controlled and renewable release of phosphorous in soils from mixtures of phosphate rock and NH4-exchanged clinoptilolite

January 1, 1986

A controlled and renewable release fertilization system is proposed that employs NH4 saturated clinoptilolite to aid in the dissolution of phosphate rock (apatite), and thereby to release soluble N, P, and exchangeable Ca for uptake by plants. The system is based on the principle that exchangers can sequester Ca ions released by the dissolution of apatite, thereby leading to further dissolution of the apatite. Experiments show that the quantity of P released by this method is an order of magnitude more than that released by apatite alone. This system offers an alternative technology to the acidulation of phosphate rock, and may circumvent problems associated with highly soluble fertilizers. 

Citation Information

Publication Year 1986
Title Controlled and renewable release of phosphorous in soils from mixtures of phosphate rock and NH4-exchanged clinoptilolite
DOI 10.1016/S0144-2449(86)80010-0
Authors T.-M. Lai, D.D. Eberl
Publication Type Article
Publication Subtype Journal Article
Series Title Zeolites
Series Number
Index ID 70014922
Record Source USGS Publications Warehouse
USGS Organization Toxic Substances Hydrology Program