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Improved Water Use Efficiency Associated with Cultivars and Agronomic Management in the North China Plain

Shijiazhuang Inst. of Agric. Modernization, The Chinese Academy of Sciences, 286 Huaizhong Rd., Shijiazhuang 050021, China

View larger version (27K): [in a new window]   Fig. 1. Grain yield and total water use (evapotranspiration, ET) for winter wheat and maize from 1982 to 2002, measured at Luancheng Station.

View larger version (17K): [in a new window]   Fig. 2. Water use efficiency (WUE) for winter wheat and maize from 1982 to 2002, measured at Luancheng Station.

View larger version (18K): [in a new window]   Fig. 3. Daily soil evaporation under mulch and without mulch, as measured by lysimeters, and leaf area index (LAI) of maize during 1999 season.

View larger version (39K): [in a new window]   Fig. 4. Water use efficiency (WUE) of maize with mulch and without mulch during seasons of 1987 to 1992 and 1997 to 2002.

View larger version (58K): [in a new window]   Fig. 5. Yield and water use efficiency (WUE) for different winter wheat treatments in 1999–2000, 2000–2001, 2001–2002, 2002–2003, and 2003–2004 at Luancheng Station (A = T0: without irrigation; B = T1N: one irrigation at jointing; C = T2: as T1N plus prewintering; D = T2N: two irrigations at jointing and flowering; E = T3: as T2N plus the prewintering irrigation; F = T3N: three irrigations at jointing, heading, and early milk; G = T4: as T3N plus irrigation at prewintering). In 2003–2004, irrigation at prewintering for T2, T3 and T4 was omitted because of heavy rainfall.