نوع مقاله : مقاله پژوهشی
نویسندگان
1 گروه آبیاری و زهکشی دانشکده علوم آب و محیط زیست، دانشگاه شهید چمران اهواز.اهواز.ایران
2 دانشیار، گروه آبیاری و زهکشی، دانشکده مهندسی آب و محیط زیست، دانشگاه شهید چمران اهواز، اهواز، ایران.
3 دانشیار گروه تولید و ژنتیک گیـاهی، دانشـگاه علـوم کشـاورزی و منـابع طبیعی خوزستان، اهواز، ایران
چکیده
کلیدواژه‌ها
عنوان مقاله [English]
نویسندگان [English]
Crop Water Stress Index (CWSI) is a practical method used to monitor water status in plants, detect when moisture stress starts, predict crop yield and irrigation schedule for different crops. The present research was conducted with the aim of calculating the CWSI index and determining the moisture stress threshold for safflower and identifying the most suitable irrigation management through the relationship between the Crop water stress index and different managements of deficit irrigation in during 2020 and 2022 growing seasons at Khuzestan University of Agriculture and Natural Resources. This design is in the form of completely randomized blocks with a conventional irrigation treatment (CI) and four deficit irrigation treatments including (RDI80, RDI60: deficit irrigation adjusted by supplying 80 and 60 percentage soil moisture deficiency) and (PRD80, PRD60: deficit irrigation in the form of partial root zone drying methods with 80 and 60 percentage of soil moisture deficiency) and with four repetitions. The results showed that the CI treatment had the lowest value of 0.17 and the RDI60 treatment had the highest Crop water stress index value of 0.67.Irrigation planning was done with the aim of achieving the maximum efficiency of water productivity efficiency, and based on this, the relationship between the permissible limit of the temperature difference of the Canopy cover of the plant and the air for the months of March ((Tc-Ta)a = 1.618 - 0.215 VPD), April ((Tc-Ta)a = 2.46-0.220 VPD) and May ((Tc-Ta)a = 4.636-0.164 VPD) were obtained. The moisture stress threshold for safflower was obtained from the regression relationship between the CWSI index and the temperature difference of the Canopy cover of the plant and the temperature of the surrounding air (Tc-Ta) equal to 0.61, which was introduced for the study area and with the research conditions.
کلیدواژه‌ها [English]
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