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As a vital beverage crop, tea has been extensively planted in tropical and subtropical regions. Nitrogen (N) levels and forms are closely related to tea quality. Based on different N levels and forms, we studied changes in NO 3  −  and NH 4  +  fluxes in tea roots utilizing scanning ion-selective electrode technique. Our results showed that under both single and mixed N forms, influx rates of NO 3  −  were much lower than those of NH 4  + , suggesting a preference for NH 4  +  in tea. With the increase in N concentration, the influx rate of NO 3  −  increased more than that of NH 4  + . The NH 4  +  influx rates in a solution without NO 3  −  were much higher than those in a solution with NO 3  − , while the NO 3  −  influx rates in a solution without NH 4  +  were much lower than those in a solution with NH 4  + . We concluded that (1) tea roots showed a preference for NH 4  + , (2) presence of NO 3  −  had a negative effect on NH 4  +  influx, and (3) NH 4  +  had a positive effect on NO 3  −  influx. Our findings not only may help advance hydroponic tea experiments but also may be used to develop efficient fertilization protocols for soil-grown tea in the future.

Characteristics of NH4+ and NO3− fluxes in tea (Camellia sinensis) roots measured by scanning ion-selective electrode technique