1. Key Laboratory of Efficient Irrigation-Drainage and Agricultural Soil-Water Environment in Southern China of Ministry of Education, Nanjing, Jiangsu 210098, China; 2.College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing, Jiangsu 210098, China
Abstract：A field experimental study was conducted to identify the effect of saline water irrigation on soil salinity movement and summer maize growth under subsurface drainage system. This study was comprised of nine treatments combined with three subsurface drainage depths, namely 0 m-no subsurface drainage(D0), 0.8 m(D1)and 1.2 m(D2)and three water salinity levels, such as 0.78 dS/m(S1), 3.75 dS/m(S2), and 6.25 dS/m(S3). The results indicate that the accumulated salt in the soil is effectively removed under subsurface drainage during the studied period. At the drainage depth of 80cm, the soil electronic conductivity within the root depth is decreased by 39.00%, 31.56% and 29.43% in S1, S2 and S3, respectively. But at the drainage depth of 120 cm, the soil electronic conductivity is decreased by 31.91%, 18.08% and 7.44% in S1, S2 and S3, respectively. The dry matter and yield of summer maize are reduced with increasing irrigation water salinity at the same drainage depth. The water use efficiency of summer maize from large to small is D1,D2 and D0 at the same irrigation water salinity. At the same drainage depth, the water use efficiency is decreased gradually with increasing irrigation water salinity.
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