Effects of saline water irrigation on soil salinity and yield of winter wheat–maize in North China Plain |
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Authors: | Wenjun Ma Zhenqiang Mao Zhenrong Yu M E F van Mensvoort P M Driessen |
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Institution: | (1) College of Resources and Environment, China Agricultural University, Haidian, Beijing, People’s Republic of China;(2) Chinese Institute of Land Survey and Planning, Xicheng, Beijing, People’s Republic of China;(3) Department of Environmental Sciences, Wageningen University, Wageningen, Netherlands |
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Abstract: | Drought and fresh water shortage are in the way of sustainable agriculture development in the North China Plain. The scarcity
of fresh water forces farmers to use shallow saline ground water, which helps to overcome drought and increase crop yields
but also increases the risk of soil salinization. This paper describes salt regimes and crop responses to saline irrigation
water based on field experiments conducted from October 1997 to September 2005. It was found that use of saline water causes
the ECe of the topsoil (0–100 cm, Cv: 0.196∼0.330) to be higher and more variable than the subsoil (100–180 cm, Cv: 0.133∼0.219).
The salt load rapidly increased, notably in the upper 80 cm and especially during the season of October 1999 to June 2000.
It was concluded that the maximum soil depth to which the soil was leached during the wet season was about 150 cm. The relative
yields of winter wheat could be ranked Fresh Sufficient (FS, 100%) > Fresh Limited (FL, 91.80%) > Saline Sufficient (SS, 91.63%)
> Saline Limited (SL, 88.28%) > Control (C, 69.58%) and for maize FS (100%) > FL (96.37%) > SS (93.05%) > SL (90.04%)> C (89.81%).
The best irrigation regime was Saline Limited for winter wheat and maize, provided rainfall is sufficient. The experiments
confirm that saline irrigation water appears to be economically attractive to farmers in the short term and ecological hazards
can still be controlled with proper leaching. |
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Keywords: | Irrigation Maize Saline water Soil salinity Winter wheat Yield |
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