عنوان مقاله [English]
To study the effect of irrigation and fertilizer levels on yieldof roselle (Hibiscus sabdariffa L.), an experiment was conducted as split plot based on randomized complete block design with three replications in Iranshahr, Iran in 2016.Treatments were included irrigation intervals of 7, 14 and 21 days and fertilizer ratios were included0:100, 75:25, 50:50, 25:75 and 100:0 manure and chemical fertilizers. Irrigation and fertilizer levels had a significant effect on most of roselle characteristics. Calyx yield with irrigation interval of 14 days, it was about 8.1 g/m2, which was increased to 10.6 g/m2 compared to 7 days irrigation interval. Integrated application of chemical fertilizer with manure was more incresing on roselle yield components than their separate application. The highest calyx yield was obtained in equal ratio of manure and chemical fertilizer, which was 23.7 and 32.2% higher than their individual application of manure and chemical fertilizer, respectively. Integrated application of manure and chemical produced more biomass. Therefore, application of equal ratio of manure and chemical fertilizer with irrigation intervals of 14 days in Iranshahr aquatic and climatic conditions isrecommended for roselle cultivation.