This experiment was studies the irrigation to effects of flowering on Lycoris aurea and soil temperature. Four irrigation systems were treated- furrow irrigation、drip irrigation、sprinkling irrigation and no irrigation. Lycoris aurea bulbs were planted on Jun. 1996. First flowering in Sep. same year, the flower quality of flowering was not significantly affected with 4 treatments and flower percentage was 19.5 to 26.8﹪. The second time flowering was in Sep. 1997. The flowering percentage of drip irrigation was 47.0﹪；furrow irrigation and sprinkling irrigation treatments both were 40﹪；no irrigation treatment was only 10﹪. Treatment with irrigation increased the flowering percentage. The longest Scapus length of flowers was 47 cm, achieved by furrow irrigation. The both lengths with drip irrigation and sprinkling irrigation treatments were 45.0 cm and 44.7 cm. The shortest scapus length of flowers 42.3cm was achieved by no irrigation. The scapus length should be more than 45 cm for export market of Lycorus aurea cut flowers. The scapus length with no irrigation treatment was too short for export market. Maximum number of flowers per plant was 6.7, obtained with furrow irrigation and sprinkling irrigation treatments. Minimum number of flowers per plant was 5.7, caused with no irrigation. Treatment with irrigation, in general, tended to advance to earlier flowering date. Treatments by irrigation promoted a number of leaves, leaf length and leaf width. Soil temperature of flowering on Lycorus aurea was under 25℃. Maximum day soil temperature was 29-32℃, minimum temperature was 26-28 on Sep. 1997. On middle Sep. night soil temperature was under 25℃.Soil temperature should be reduced with irrigation treatment. So the flowering date could be improved early with irrigation treatments.
