Evaluation of Crop Water Stress Index (CWSI) for potato under different irrigation regimes in surface and subsurface drip irrigation systems

Document Type : Research Paper


1 Ph.D. Student of Irrigation and Drainage, Faculty of Water Sciences Engineering, Shahid Chamran University of Ahvaz

2 Associate professor of Irrigation and Drainage, Faculty of Water Sciences Engineering, Shahid Chamran University of Ahvaz

3 Professor of Irrigation and Drainage, Faculty of Water Sciences Engineering, Shahid Chamran University of Ahvaz

4 Assistant Professor, Soil and Water Research Department, Agriculture and Natural Resources Research and Education Center of Chaharmahal and Bakhtiari Province, AREEO (Agricultural Research, Education and Extention Organization), Shahrekord


In order to evaluate the Crop Water Stress Index (CWSI) of potato crop, a split- plot design was carried out in a randomized complete block design in Shahrekord Agricultural and Natural Resources Research Center in the growing season of 2018. This experiment consists of two methods of irrigation (surface and subsurface drip irrigation) in the main plots and four irrigation levels (Full Iirrigation, FI; Regulated Deficit Irrigation, RDI-80; Regulated Deficit Irrigation, RDI-65; and Partial Root-zone Drying PRD-75) in subplots, in three replications for potato (Bourren cultivar) with a period of growth of 120 days. Based on the results, the trend of changes in the CWSI of the crop in irrigation treatments for surface and subsurface drip irrigation was between 0.16 and 0.56 and 0.15-0.49, respectively.The relationship between CWSI and yield (Y) for surface and subsurface drip irrigation was Y = -122.28 CWSI + 82.38 and Y = -101.61 CWSI + 70.97, respectively. The yield of crop for treatments FI، RDI_80، PRD_75 and RDI_65 in surface drip irrigation was 52.1, 48, 31.6, and 23.4 Ton.ha-1, respectively and for subsurface drip irrigation 48.6, 44.3, 29.6 and 21.8 Ton.ha-1, respectively.The maximum amount of water consumed for treatment FI was 4590.2 m3.ha-1. The results showed that in order to achieve the highest yield in subsurface drip irrigation, the potato crop should be irrigated in the range of 0.16 to 0.2 of the CWSI.


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