Effects of irrigation with reclaimed water on root system and yield of winter wheat

The effects of irrigation with reclaimed water on height, root and yield of winter wheat were studied in this paper. Treatments included continuous irrigation with normal water(T1) , continuous irrigation with reclaimed water(T2), irrigation with reclaimed water from Oct, 2000 to Oct, 2003 then irrigation with normal water from Oct, 2003 to Jun, 2006(T3) and irrigation with normal water from Oct, 2000 to Oct, 2003 then irrigation with reclaimed water from Oct, 2003 to Jun, 2006(T4). Experimental results illustrated that the height and total leaf area for per plant had no significant difference between treatments. The root length, root weight and root surface area in unite volume soil all decreased with the increase of soil depth for all treatments, and above indexes had no significant difference between treatments in the extent of 0～100 cm soil(p＝0.05). Irrigation with reclaimed water did not influence the depth of main root, the root distributed in 0～20 cm soil mainly and the root quantity in 0～70 cm soil was the 95 percent of total root quantity. According to experimental results during 2000～2006, treatments that irrigated with reclaimed water had no significant influence on the yield of winter wheat except the experiment during 2001～2002. Compared with the treatment that irrigated with local ground water, the yield of winter wheat was increased by irrigation with reclaimed water about 22.3% during 2001～2002.