A plastic greenhouse study was implemented to evaluate the potential use of treated wastewater for irrigation of Asiatic lily 'Brunello' grown in zeolite. Plants received the following treatments: a nutrient solution (N) alone, (N) mixed with treated wastewater (W) at rates of 3N:1W, 1N:1W and 1N:3W respectively. A closed system was used in which the drain solution was circulated for several days until its electrical conductivity reached 2.3 dS m -1 , after which fresh irrigation solutions were used to start a second cycle of circulation. The results indicated that plants irrigated with (N) or 3N:1W solution had the longest stems (34.4 and 36.2 cm) respectively, peduncles and buds (about 4.5 cm), and the greatest shoot (3.4 and 3.8 cm) and bud mass (14.95 and 17.6 g) respectively. Plants irrigated with 1N:3W solution had the highest dry mass tissue content of K (3.06 g kg -1 ) and B (35.5 mg kg -1 ). Plants irrigated with 1N:1W or 1N:3W were inferior to other plants. It can be concluded that 1N:3W mixture may be used for production of high quality cut flowers of lily. Moreover, it is expected to save 3.4 litres m V raziskavi, izvedeni v plastenjaku, je bila ovrednotena potencialna uporaba odpadne vode za gojenje azijskih lilij 'Brunello' gojenih na zeolitu. Opravljena so bila naslednja obravnavanja: uporaba čiste hranilne raztopin (N), mešanica hranilne raztopine (N) z odpadno vodo (W) v razmerjih 3N:1W, 1N:1W in 1N:3W. Uporabljen je bil zaprt sistem, v katerem je raztopina krožila več dni, dokler njena električna prevodnost ni dosegla 2,3 dS m -1 , potem je bila uporabljena sveža raztopina za začetek drugega kroga poskusa. Rezultati so pokazali, da so imele rastline, ki so bile namakane samo s hranilno raztopino (N) ali z mešanico 3N:1W, najdaljša stebla (34,4 in 36,2 cm), cvetne peclje in popke (okrog 4,5 cm), največjo maso poganjkov (3,4 in 3,8 cm) in popkov (14,95 in 17,6 g). Rastline, ki so bile zalivane z raztopino 1N:3W, so imele največjo suho maso tkiv, največjo vsebnost K (3,06 g kg -1 ) in B (35,5 mg kg -1 ). Rastline, ki so bile namakane z mešanicami raztopin 1N:1W in 1N:3W so bile slabše v primerjavi s prejšnjimi. Zaključili bi lahko, da bi za pridelavo zelo kvalitetnega rezanega cvetja azijskih lilij lahko uporabili mešanico raztopin 1N:3W in s tem prihranili 3,4 l m -2 hranilne raztopine in 1850, 347 in 1870 mg m -2 dan -1 N, P in K.