Determining cwsi to estimate eggplant evapotranspiration and yield under greenhouse and outdoor conditions
Publish place: Iran Agricultural Research، Vol: 34، Issue: 2
Publish Year: 1394
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_IAR-34-2_007
تاریخ نمایه سازی: 13 شهریور 1402
Abstract:
ABSTRACT- The crop water stress index (CWSI) is the most common index to monitor and assess crop water stress, based on canopy temperature. To calculate CWSI, upper and lower baselines adaptable to different environments are needed. In this study, empirical and theoretical limiting baseline equations were developed to determine eggplant CWSI values at different levels of water deficit and salinity stress. The limiting baseline and CWSI values of eggplant were obtained under different watering intervals (daily, weekly and every two weeks) and different irrigation water salinity levels (i.e. ۰.۸, ۲.۵, ۵ and ۷ dsm-۱) for greenhouse and outdoor conditions. The impact of various levels of water deficit and salinity on total evapotranspiration, yield and CWSI was also studied. With the increase of water salinity, a decrease in the slope of lower baseline was met (from ۰.۱۹۵ to ۰.۱۴۶ in the greenhouse and from ۰.۱۳۴ to ۰.۰۹۸ in the outdoor conditions) along with a rise in the upper baseline. Increase in the levels of water deficit led to greater fluctuations in CWSI variations during the growing season. According to the Duncan's test results, CWSI values were significantly affected by water deficit and salinity in both environments
Keywords:
Authors
Ali Asghar Ghaemi
Department of Water Engineering, College of Agriculture, Shiraz University, Shiraz, I.R. Iran
H Moazed
Department of water sciences Engineering, College of Agriculture Shahid Chamran University, Ahwaz, I. R. Iran
M Rafie Rafiee
Department of Irrigation, Jahrom Universtiy, Jahrom, I.R. Iran
S Broomand Nasab
Department of water sciences Engineering, College of Agriculture Shahid Chamran University, Ahwaz, I. R. Iran
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