Akademik Veri Yönetim Sistemi
Irrigation Science, cilt.41, sa.5, ss.603-628, 2023 (SCI-Expanded)
This study compares conventional drip irrigation (CDI) and partial root drying (PRD) on yield components, oil quality, and economic return of peanut crops in the 2014 and 2015 growing seasons in the Mediterranean climatic conditions of Türkiye. The main plots and subplots consisted of 3 irrigation frequencies (IF25; IF50 and IF75) and 7 irrigation levels (IL0.50 = 0.50, IL0.75 = 0.75, IL1.0 = 1.00, IL1.25 = 1.25, ILPRD50, ILPRD75, and ILPRD100). Of the subplots, 4 were CDI treatments (IL0.50 = 0.50, IL0.75 = 0.75, IL1.0 = 1.00, IL1.25 = 1.25), and 3 were PRD treatments (ILPRD50, ILPRD75, and ILPRD100). CDI treatments (IL0.50, IL0.75, IL1.0, and IL1.25) received 50, 75, 100, and 125 of Cumulative Pan Evaporation. In addition, PRD treatments (ILPRD50, ILPRD75, and ILPRD100) were considered. They received 50, 75, and 100% of IL1.0 treatment from alternate laterals, respectively. The largest and the smallest average peanut yields were obtained from the IF50IL1.25 and IF75IL0.50 treatments each year. The result showed that increasing the irrigation water amount increases the oil yield. The highest oil content, peanut yield, and generating maximum return were obtained from IF50IL1.25 in both growth years. The saturated and unsaturated fatty acid contents were remarkably influenced by IFs and ILs. Stearic acid concentration considerably decreased under unstressed conditions, while palmitic acid values increase. The peanut quality was also affected under water stress with lower oil content. PRD has a marked effect on peanut quality under deficit irrigation of water applied with significantly reduced compared with DI. The high oil yield response factor (kyoil) value acquired for the peanut crop indicated its high sensitivity to irrigation interval and water deficit. It was determined that there are considerable linear relationships between the oleic acid and linoleic acid contents compared to crop evapotranspiration (ETc) during different irrigation intervals in each season. Economic assessment expressed that IF50IL1.25 treatment attained the highest seed and oil yield of peanuts and maximum net return in both seasons. Overall, the findings showed that pod yield per hectare, pod weight per plant, pod number per plant, shelling percentage, palmitic and linoleic acid percentage, oil percentage, and 100-seed weight values increased with increasing irrigation water at each irrigation interval, but oleic and stearic acid percentages decreased in both years.