Evaluating salinity distribution in soil irrigated with saline water in arid regions of northwest China

In arid and semi-arid regions, salinity is a serious and chronic problem for agriculture. A 3-year field experiment in the arid environment of Xinjiang, northwest China, was conducted to study the salinity change in soil resulting from deficit irrigation of cotton with non-saline, moderate saline and high saline water. The salinity profile distribution was also evaluated by an integrated water, salinity, and nitrogen model, ENVIRO-GRO. The simulated and observed salinity distributions matched well. Results indicated that after 3 years of cotton production, the average salinity in the 1.0-m soil profile was 336% and 547% of the original soil profile, respectively, for moderate saline and high saline water irrigation. If the practices continued, the average soil salinity (ECe) in the 1.0-m soil profile would approach a steady level of 1.7, 10.8, and 14.7Â dSÂ m-1, respectively, for the treatments receiving irrigation waters of 0.33, 3.62, and 6.71Â dSÂ m-1. It was concluded that deficit irrigation of saline water in this region was not sustainable. Model simulation showed that a big flood irrigation after harvest can significantly reduce the salt accumulation in the soil profile, and that this practice was much more efficient for salinity control than applying the same extra amount of water during the growing season.

[1]  Yan Li,et al.  Soil salinity evolution and its relationship with dynamics of groundwater in the oasis of inland river basins: case study from the Fubei region of Xinjiang Province, China , 2008, Environmental monitoring and assessment.

[2]  C. Willmott.  ON THE VALIDATION OF MODELS , 1981 .

[3]  Van Genuchten,et al.  A closed-form equation for predicting the hydraulic conductivity of unsaturated soils , 1980 .

[4]  Ed H. Chi.  Validation of Model , 2002 .

[5]  R. Ragab,et al.  Effect of irrigation methods, management and salinity of irrigation water on tomato yield, soil moisture and salinity distribution , 2008, Irrigation Science.

[6]  Salt, Water, and Groundwater Management Models to Determine Sustainable Cropping Patterns in Shallow Saline Groundwater Regions of Australia , 2003 .

[7]  J. Schilfgaarde.  Irrigation — a blessing or a curse , 1994 .

[8]  X. Pang,et al.  Development and Evaluation of ENVIRO-GRO, an Integrated Water, Salinity, and Nitrogen Model , 1998 .

[9]  M. S. Bajwa,et al.  Effect of sustained saline irrigation on soil salinity and crop yields , 1986, Irrigation Science.

[10]  M. Mohammad.  Squash yield, nutrient content and soil fertility parameters in response to methods of fertilizer application and rates of nitrogen fertigation , 2004, Nutrient Cycling in Agroecosystems.

[11]  P. Vlek,et al.  Modeling irrigated cotton with shallow groundwater in the Aral Sea Basin of Uzbekistan: II. Soil salinity dynamics , 2009, Irrigation Science.

[12]  J. Šimůnek,et al.  Leaching requirement for soil salinity control: Steady-state versus transient models , 2007 .

[13]  John Letey,et al.  Evaluation of a model for irrigation management under saline conditions : II. Salt distribution and rooting pattern effects , 2003 .

[14]  L. S. Pereira,et al.  Crop evapotranspiration : guidelines for computing crop water requirements , 1998 .

[15]  R. Ayers,et al.  Water quality for agriculture , 1976 .

[16]  Julián Martı́nez Beltrán,et al.  Irrigation with saline water: benefits and environmental impact , 1999 .

[17]  D. Wichelns,et al.  Economic and agronomic strategies to achieve sustainable irrigation , 2003, Irrigation Science.

[18]  U. Shani,et al.  Influence of Plant, Soil, and Water on the Leaching Fraction , 2008 .

[19]  P. Ridd,et al.  Measurement of the diffusion coefficient for salt in salt flat and mangrove soils , 2000, Wetlands Ecology and Management.

[20]  Laj R. Ahuja,et al.  RZWQM: Simulating the effects of management on water quality and crop production , 1998 .

[21]  J. Nash,et al.  River flow forecasting through conceptual models part I — A discussion of principles☆ , 1970 .

[22]  Z. Plaut,et al.  Cotton root and shoot responses to subsurface drip irrigation and partial wetting of the upper soil profile , 1996, Irrigation Science.

[23]  Joginder Singh,et al.  Irrigation planning in cotton through simulation modeling , 1996, Irrigation Science.

[24]  P. Vlek,et al.  Modeling irrigated cotton with shallow groundwater in the Aral Sea Basin of Uzbekistan: I. Water dynamics , 2009, Irrigation Science.

[25]  John Letey,et al.  Evaluation of a Model for Irrigation Management Under Saline Conditions , 2003 .

[26]  P. Reidy,et al.  Mobility and Degradation of Organic Contaminants in Subsurface Environments , 1992 .

[27]  R. Ragab,et al.  A holistic generic integrated approach for irrigation, crop and field management: 2- The SALTMED model calibration using field data from Egypt and Syria. , 2005 .

[28]  W. G. Knisel,et al.  GLEAMS: Groundwater Loading Effects of Agricultural Management Systems , 1987 .