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Environmental Modeling & Assessment

, Volume 19, Issue 1, pp 45–55 | Cite as

Calibration and Validation of SWAP to Simulate Conjunctive Use of Fresh and Saline Irrigation Waters in Semi-Arid Regions

  • Ajit Kumar VermaEmail author
  • Suresh Kumar Gupta
  • Rajendra Kumar Isaac
Article

Abstract

Soil–Water–Atmosphere–Plant (SWAP) version 2.0 was evaluated for its capability to simulate crop growth and salinity profiles at Agra (India) located in a semi-arid region having deep water table and monsoon climate. The data of 12 conjunctive use treatment combinations simulating cyclic and mixing modes of fresh and saline water for wheat were used to calibrate and validate the model. Absolute deviations between the SWAP simulated and observed relative yields during calibration ranged from 2.5 to 2.9 %. A close agreement in the trend and values of measured and simulated soil salinity profiles was observed. Scenario building simulations carried out with the validated SWAP revealed that the maximum crop yields varied from 97 to 99 % with the best available water (EC 3.6 dS m−1) while the minimum ranged from 65 to 79 % in the treatment with all saline water. Other than this, the relative yield varied from 80 to 98 % in 10 other cyclic and mixing mode treatments. It was established that notwithstanding the seasonal build-up of salts due to saline water use, there would be no long-term build-up of salts as leaching during the monsoon season would render the soil profile salt free at the time of sowing of rabi (winter) crops. Thus, short-term field observations could be used in conjunction with SWAP to show that there seems to be an assured long-term sustainability when saline water is used in conjunctive mode with fresh water in monsoon climatic conditions with deep water table. These results are in conformity with the observation that many farmers in India are using saline and fresh water in conjunctive mode on a long-term basis.

Keywords

Simulation SWAP Cyclic and mixing mode Relative yield Salinity profile Wheat 

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Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • Ajit Kumar Verma
    • 1
    Email author
  • Suresh Kumar Gupta
    • 2
  • Rajendra Kumar Isaac
    • 3
  1. 1.Central Institute of Fisheries EducationMumbaiIndia
  2. 2.Central Soil Salinity Research InstituteKarnalIndia
  3. 3.Sam Higginbottom Institute of Agriculture, Technology and Sciences (SHIATS)AllahabadIndia

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