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Performance of Double-Cropped Winter Wheat–Summer Maize under Minimum Irrigation in the North China Plain

The Center for Agricultural Resources Research, Institute of Genetic and Developmental Biology, The Chinese Academy of Sciences, 286 Huaizhong Rd., Shijiazhuang 050021, China

View larger version (18K): [in a new window]   Fig.1. The distribution of root length density for winter wheat and maize at mature under minimum irrigation (MI) in 2002–2003.

View larger version (13K): [in a new window]   Fig. 2. Soil moisture distribution at sowing and harvesting for winter wheat under minimum irrigation (MI) in the dry season of 1999–2000 (seasonal rainfall was 50.1 mm) and the wet season of 2003–2004 (seasonal rainfall was 210.6 mm).

View larger version (34K): [in a new window]   Fig. 3. Yield of winter wheat and maize under minimum irrigation (MI) and full irrigation (FI) from 1997 to 2005 (yield difference of winter wheat between MI and FI was significant at P < 0.05 for six seasons, except in 2002–2003 and 2003–2004; for maize, except in 2002 and 2003, yield difference between MI and FI was significant at P < 0.05; bars represent standard deviation).

View larger version (23K): [in a new window]   Fig. 4. The correlation of yield reduction under minimum irrigation (MI) compared with full irrigation (FI) with seasonal rainfall for winter wheat and maize from 1997 to 2005.

View larger version (17K): [in a new window]   Fig. 5. The probability of receiving a cumulative seasonal precipitation for winter wheat and maize based on rainfall recording from 1960 to 2005.