Abstract: In order to explore water\|saving cultivation method for double\|harvest Zizania latifolia， effects of four different irrigation treatments on the growth and yield of Z. latifolia were conducted. The treatments were set as combinations of different growth stages with different water depth of irrigation （WDI）. The WDI of treatment Ⅰ， Ⅱ， Ⅲ， Ⅳ was 4-5， 4-5， 8-9， 14-15 cm， respectively， at earlier and middle tiller stage， 1-2， 4-5， 4-5， 8-9 cm， respectively， at later tiller stage， 8-9， 14-15， 14-15， 19-20 cm， respectively， at stem swelling stage， and 1-2， 4-5， 4-5， 8-9 cm， respectively， at harvest stage. It was shown that plant height of treatment Ⅰ， Ⅱ and Ⅲ was shorter than that of treatment Ⅳ， while tiller numbers of formers were larger than the latter， and no significant difference was found among the former three treatments. Weights of vaginated Zizania shoot and bald Zizania shoot showed no significant difference among four treatments， while the length and width of bald Zizania shoot of treatment Ⅰ， Ⅱ and Ⅲ were bigger than treatment Ⅳ. The yield of treatment Ⅱ and Ⅲ increased by 079% and 387% than treatment Ⅳ， while the yield of treatment Ⅰ was a little lower than that of treatment Ⅳ. The present results indicated that compared with traditional irrigation method （treatment Ⅳ）， a cut down of 30%-50% irrigation quantity in the tiller， stem swelling and harvest stage， respectively， could reduce the height of Zizania plants， while increase the tiller number， and finally increase the yield obviously. It was concluded that the water\|saving cultivation of Z. latifolia was feasible， and quantity of water could be reduced by 30%-50%.

Key words: double\, harvest Zizania latifolia, irrigation methods, growth, yield