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The clinoptilolite-rich tuff (NZ) from Zlatokop deposit (Vranjska Banja,   Serbia) has been studied as a nitrogen carrier for grass production.   Mechanism of binding ammonium cations present in water solutions by NZ has   been examined as well as possibility of adsorption of ammonia released in   fresh cattle manure during its fermentation. The NH4+ binding from solutions   proceeds via an ion-exchange process which follows the pseudo-second-order   kinetics. Adsorption isotherms studied at 298-318 K follow the Freundlich   isotherm equation. The NZ readily adsorbs ammonia liberated from manure and   an addition of 10 wt.% of NZ to manure can preserve up to 90% of ammonia.   The potential benefit of this effect has been examined in greenhouse pot   experiments with the Italian ryegrass (Lolium multiflorum, var. Macho) using   three different types of soil (silty, clayey and sandy). The zeta potential   measurements show that stability of their colloidal dispersions differs   mutually and that addition of the NZ differently affects the stability and   nitrogen cycling. All results indicate that NZ can be applied in grass   production. [Projekat Ministarstva nauke Republike Srbije, br. 172018 and   Norwegian Programme in Higher Education, Research and Development HERD

The use in grass production of clinoptilolite as an ammonia adsorbent and a nitrogen carrier