This study examined the possibility of direct appliion of phosphate rock (PR) from Lisina deposit, in a mixture with natural clinoptilolite (Cp) and clinoptilolite partially saturated with ammonium ions (NH4Cp). Solution P concentrations of the NH4Cp/PR mixtures were sufficient for plant growth and ranged from to mg L(1). The median NH4Cp/PR ratio and the longest proposed ...
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